adding a scribe logger in leveldb to log leveldb deploy stats

Summary: as subject. A new log is written to scribe via thrift client when a new db is opened and when there is a compaction. a new option var scribe_log_db_stats is added. Test Plan: manually checked using command "ptail -time 0 leveldb_deploy_stats" Reviewers: dhruba Differential Revision: https://reviews.facebook.net/D4659
2012-08-14 15:20:36 -07:00 · 2012-08-14 15:20:36 -07:00 · 6ba1f17789
commit 6ba1f17789
parent e56b2c5a31
22 changed files with 2911 additions and 23 deletions
--- a/12
+++ b/12
@ -102,9 +102,14 @@ esac
 # prune take effect.
 DIRS="util db table"
 if test "$USE_THRIFT"; then
-  DIRS+=" thrift/gen-cpp thrift/server_utils.cpp "
+  DIRS+=" thrift/server_utils.cpp thrift/gen-cpp "
  THRIFTSERVER=leveldb_server
 fi
+
+if test "$USE_SCRIBE"; then
+  DIRS+=" scribe "
+fi
+
 set -f # temporarily disable globbing so that our patterns aren't expanded
 PRUNE_TEST="-name *test*.cc -prune"
 PRUNE_BENCH="-name *_bench.cc -prune"
@ -197,6 +202,11 @@ if test "$USE_THRIFT"; then
  PLATFORM_LDFLAGS+=$THRIFT_LDFLAGS
 fi

+#shall we build with scribe
+if test "$USE_SCRIBE"; then
+  COMMON_FLAGS="$COMMON_FLAGS -I./thrift/lib/ -DUSE_SCRIBE"
+fi
+
 PLATFORM_CCFLAGS="$PLATFORM_CCFLAGS $COMMON_FLAGS"
 PLATFORM_CXXFLAGS="$PLATFORM_CXXFLAGS $COMMON_FLAGS"

--- a/db/db_impl.cc
+++ b/db/db_impl.cc
@ -144,6 +144,20 @@ DBImpl::DBImpl(const Options& options, const std::string& dbname)

  versions_ = new VersionSet(dbname_, &options_, table_cache_,
                             &internal_comparator_);
+
+#ifdef USE_SCRIBE
+  logger_ = new ScribeLogger("localhost", 1456);
+#endif
+
+  char name[100];
+  Status st = env_->GetHostName(name, 100);
+  if(st.ok()) {
+    host_name_ = name;
+  } else {
+    Log(options_.info_log, "Can't get hostname, use localhost as host name.");
+    host_name_ = "localhost";
+  }
+  last_log_ts = 0;
 }

 DBImpl::~DBImpl() {
@ -536,6 +550,7 @@ Status DBImpl::CompactMemTable() {
    imm_ = NULL;
    has_imm_.Release_Store(NULL);
    DeleteObsoleteFiles();
+    MaybeScheduleLogDBDeployStats();
  }

  return s;
@ -559,15 +574,15 @@ void DBImpl::CompactRange(const Slice* begin, const Slice* end) {
 }

 int DBImpl::NumberLevels() {
-	return options_.num_levels;
+  return options_.num_levels;
 }

 int DBImpl::MaxMemCompactionLevel() {
-	return options_.max_mem_compaction_level;
+  return options_.max_mem_compaction_level;
 }

 int DBImpl::Level0StopWriteTrigger() {
-	return options_.level0_stop_writes_trigger;
+  return options_.level0_stop_writes_trigger;
 }

 Status DBImpl::Flush(const FlushOptions& options) {
@ -620,34 +635,33 @@ Status DBImpl::FlushMemTable(const FlushOptions& options) {
 }

 Status DBImpl::WaitForCompactMemTable() {
-    Status s;
-    // Wait until the compaction completes
-    MutexLock l(&mutex_);
-    while (imm_ != NULL && bg_error_.ok()) {
-        bg_cv_.Wait();
-    }
-    if (imm_ != NULL) {
-        s = bg_error_;
-    }
-    return s;
+  Status s;
+  // Wait until the compaction completes
+  MutexLock l(&mutex_);
+  while (imm_ != NULL && bg_error_.ok()) {
+    bg_cv_.Wait();
+  }
+  if (imm_ != NULL) {
+    s = bg_error_;
+  }
+  return s;
 }

-
 Status DBImpl::TEST_CompactMemTable() {
  return FlushMemTable(FlushOptions());
 }

 Status DBImpl::TEST_WaitForCompactMemTable() {
-	return WaitForCompactMemTable();
+  return WaitForCompactMemTable();
 }

 Status DBImpl::TEST_WaitForCompact() {
-	// Wait until the compaction completes
-	MutexLock l(&mutex_);
-	while (bg_compaction_scheduled_ && bg_error_.ok()) {
-		bg_cv_.Wait();
-	}
-	return bg_error_;
+  // Wait until the compaction completes
+  MutexLock l(&mutex_);
+  while (bg_compaction_scheduled_ && bg_error_.ok()) {
+    bg_cv_.Wait();
+  }
+  return bg_error_;
 }

 void DBImpl::MaybeScheduleCompaction() {
@ -678,6 +692,8 @@ void DBImpl::BackgroundCall() {
  }
  bg_compaction_scheduled_ = false;

+  MaybeScheduleLogDBDeployStats();
+
  // Previous compaction may have produced too many files in a level,
  // so reschedule another compaction if needed.
  MaybeScheduleCompaction();
@ -1482,6 +1498,7 @@ Status DB::Open(const Options& options, const std::string& dbname,
    if (s.ok()) {
      impl->DeleteObsoleteFiles();
      impl->MaybeScheduleCompaction();
+      impl->MaybeScheduleLogDBDeployStats();
    }
  }
  impl->mutex_.Unlock();
--- a/db/db_impl.h
+++ b/db/db_impl.h
@ -7,12 +7,20 @@

 #include <deque>
 #include <set>
+#include <atomic>
 #include "db/dbformat.h"
 #include "db/log_writer.h"
 #include "db/snapshot.h"
 #include "leveldb/db.h"
 #include "leveldb/env.h"
 #include "port/port.h"
+#include "util/stats_logger.h"
+
+#ifdef USE_SCRIBE
+#include "scribe/scribe_logger.h"
+#endif
+
+#include <boost/lexical_cast.hpp>

 namespace leveldb {

@ -107,6 +115,9 @@ class DBImpl : public DB {
  // Wait for memtable compaction
  Status WaitForCompactMemTable();

+  void MaybeScheduleLogDBDeployStats();
+  static void LogDBDeployStats(void* db);
+
  void MaybeScheduleCompaction();
  static void BGWork(void* db);
  void BackgroundCall();
@ -144,6 +155,8 @@ class DBImpl : public DB {
  uint64_t logfile_number_;
  log::Writer* log_;

+  std::string host_name_;
+
  // Queue of writers.
  std::deque<Writer*> writers_;
  WriteBatch* tmp_batch_;
@ -172,6 +185,10 @@ class DBImpl : public DB {
  // Have we encountered a background error in paranoid mode?
  Status bg_error_;

+  StatsLogger* logger_;
+
+  std::atomic<int64_t> last_log_ts;
+
  // Per level compaction stats.  stats_[level] stores the stats for
  // compactions that produced data for the specified "level".
  struct CompactionStats {
--- a/db/db_stats_logger.cc
+++ b/db/db_stats_logger.cc
@ -0,0 +1,72 @@
+// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file. See the AUTHORS file for names of contributors.
+
+#include "db/db_impl.h"
+#include <string>
+#include <stdint.h>
+#include "db/version_set.h"
+#include "leveldb/db.h"
+#include "leveldb/env.h"
+
+namespace leveldb {
+
+void DBImpl::MaybeScheduleLogDBDeployStats() {
+
+  // There is a lock in the actual logger.
+  if (!logger_ || options_.db_stats_log_interval < 0
+      || host_name_.empty()) {
+    return;
+  }
+  if (shutting_down_.Acquire_Load()) {
+    // Already scheduled
+  } else {
+    int64_t current_ts = 0;
+    Status st = env_->GetCurrentTime(&current_ts);
+    if (!st.ok()) {
+      return;
+    }
+    if ((current_ts - last_log_ts) < options_.db_stats_log_interval) {
+      return;
+    }
+    last_log_ts = current_ts;
+    env_->Schedule(&DBImpl::LogDBDeployStats, this);
+  }
+}
+
+void DBImpl::LogDBDeployStats(void* db) {
+  DBImpl* db_inst = reinterpret_cast<DBImpl*>(db);
+
+  if (db_inst->shutting_down_.Acquire_Load()) {
+    return;
+  }
+
+  std::string version_info;
+  version_info += boost::lexical_cast<std::string>(kMajorVersion);
+  version_info += ".";
+  version_info += boost::lexical_cast<std::string>(kMinorVersion);
+  std::string data_dir;
+  db_inst->env_->GetAbsolutePath(db_inst->dbname_, &data_dir);
+
+  uint64_t file_total_size = 0;
+  uint32_t file_total_num = 0;
+  for (int i = 0; i < db_inst->versions_->NumberLevels(); i++) {
+    file_total_num += db_inst->versions_->NumLevelFiles(i);
+    file_total_size += db_inst->versions_->NumLevelBytes(i);
+  }
+
+  VersionSet::LevelSummaryStorage scratch;
+  const char* file_num_summary = db_inst->versions_->LevelSummary(&scratch);
+  std::string file_num_per_level(file_num_summary);
+  const char* file_size_summary = db_inst->versions_->LevelDataSizeSummary(
+      &scratch);
+  std::string data_size_per_level(file_num_summary);
+  int64_t unix_ts;
+  db_inst->env_->GetCurrentTime(&unix_ts);
+
+  db_inst->logger_->Log_Deploy_Stats(version_info, db_inst->host_name_,
+      data_dir, file_total_size, file_total_num, file_num_per_level,
+      data_size_per_level, unix_ts);
+}
+
+}
--- a/db/version_set.cc
+++ b/db/version_set.cc
@ -1145,6 +1145,21 @@ const char* VersionSet::LevelSummary(LevelSummaryStorage* scratch) const {
  return scratch->buffer;
 }

+const char* VersionSet::LevelDataSizeSummary(
+    LevelSummaryStorage* scratch) const {
+  int len = snprintf(scratch->buffer, sizeof(scratch->buffer), "files_size[");
+  for (int i = 0; i < NumberLevels(); i++) {
+    int sz = sizeof(scratch->buffer) - len;
+    int ret = snprintf(scratch->buffer + len, sz, "%ld ",
+        NumLevelBytes(i));
+    if (ret < 0 || ret >= sz)
+      break;
+    len += ret;
+  }
+  snprintf(scratch->buffer + len, sizeof(scratch->buffer) - len, "]");
+  return scratch->buffer;
+}
+
 uint64_t VersionSet::ApproximateOffsetOf(Version* v, const InternalKey& ikey) {
  uint64_t result = 0;
  for (int level = 0; level < NumberLevels(); level++) {
--- a/db/version_set.h
+++ b/db/version_set.h
@ -241,6 +241,10 @@ class VersionSet {
  // printf contents (for debugging)
  Status DumpManifest(Options& options, std::string& manifestFileName);

+  // Return a human-readable short (single-line) summary of the data size
+  // of files per level.  Uses *scratch as backing store.
+  const char* LevelDataSizeSummary(LevelSummaryStorage* scratch) const;
+
 private:
  class Builder;

--- a/fbcode.sh
+++ b/fbcode.sh
@ -11,6 +11,10 @@ TOOLCHAIN_LIB_BASE="/mnt/gvfs/third-party/$TOOLCHAIN_REV/gcc-4.6.2-glibc-2.13"
 # always build thrift server
 export USE_THRIFT=1

+if ! test "$NO_SCRIBE"; then
+export USE_SCRIBE=1
+fi
+
 # location of libhdfs libraries
 if test "$USE_HDFS"; then
  JAVA_HOME="/usr/local/jdk-6u22-64"
--- a/hdfs/env_hdfs.h
+++ b/hdfs/env_hdfs.h
@ -122,6 +122,20 @@ class HdfsEnv : public Env {
    posixEnv->SleepForMicroseconds(micros);
  }

+  virtual Status GetHostName(char* name, uint len) {
+    return posixEnv->GetHostName(name, len);
+  }
+
+  virtual Status GetCurrentTime(int64_t* unix_time) {
+    return posixEnv->NowUnixTime(unix_time);
+  }
+
+  virtual Status GetAbsolutePath(const std::string& db_path,
+      std::string* output_path) {
+    return posixEnv->GetAbsolutePath(db_path, output_path);
+  }
+
+
  static uint64_t gettid() {
    assert(sizeof(pthread_t) <= sizeof(uint64_t));
    return (uint64_t)pthread_self();
@ -245,6 +259,14 @@ class HdfsEnv : public Env {
  virtual uint64_t NowMicros() {}

  virtual void SleepForMicroseconds(int micros) {}
+
+  virtual Status GetHostName(char* name, uint len) {}
+
+  virtual Status GetCurrentTime(int64_t* unix_time) {}
+
+  virtual Status GetAbsolutePath(const std::string& db_path,
+      std::string* outputpath) {}
+
 };
 }

--- a/include/leveldb/env.h
+++ b/include/leveldb/env.h
@ -145,6 +145,16 @@ class Env {
  // Sleep/delay the thread for the perscribed number of micro-seconds.
  virtual void SleepForMicroseconds(int micros) = 0;

+  // Get the current host name.
+  virtual Status GetHostName(char* name, uint len) = 0;
+
+  // Get the number of seconds since the Epoch, 1970-01-01 00:00:00 (UTC).
+  virtual Status GetCurrentTime(int64_t* unix_time) = 0;
+
+  // Get full directory name for this db.
+  virtual Status GetAbsolutePath(const std::string& db_path,
+      std::string* output_path) = 0;
+
 private:
  // No copying allowed
  Env(const Env&);
--- a/include/leveldb/options.h
+++ b/include/leveldb/options.h
@ -198,6 +198,12 @@ struct Options {
  // Default: false
  bool disableDataSync;

+  // This number controls how often a new scribe log about
+  // db deploy stats is written out.
+  // -1 indicates no logging at all.
+  // Default value is 1800 (half an hour).
+  int db_stats_log_interval;
+
  // Create an Options object with default values for all fields.
  Options();
 };
--- a/scribe/if/gen-cpp/scribe.cpp
+++ b/scribe/if/gen-cpp/scribe.cpp
--- a/scribe/if/gen-cpp/scribe.h
+++ b/scribe/if/gen-cpp/scribe.h
@ -0,0 +1,593 @@
+/**
+ * Autogenerated by Thrift
+ *
+ * DO NOT EDIT UNLESS YOU ARE SURE THAT YOU KNOW WHAT YOU ARE DOING
+ *  @generated
+ */
+#ifndef  _Tleveldb_scribe_H
+#define  _Tleveldb_scribe_H
+
+#include <TDispatchProcessor.h>
+#include "scribe_types.h"
+
+namespace Tleveldb {
+
+class scribeIf {
+ public:
+  virtual ~scribeIf() {}
+  virtual ResultCode Log(const std::vector<LogEntry> & messages) = 0;
+  virtual void LogMulti(std::vector<ResultCode> & _return, const std::vector<LogEntry> & messages) = 0;
+  virtual ResultCode LogCompressedMsg(const std::string& compressedMessages) = 0;
+};
+
+class scribeIfFactory {
+ public:
+  typedef scribeIf Handler;
+
+  virtual ~scribeIfFactory() {}
+
+  virtual scribeIf* getHandler(::apache::thrift::server::TConnectionContext* ctx) = 0;
+  virtual void releaseHandler(scribeIf* handler) = 0;
+};
+
+class scribeIfSingletonFactory : virtual public scribeIfFactory {
+ public:
+  scribeIfSingletonFactory(const boost::shared_ptr<scribeIf>& iface) : iface_(iface) {}
+  virtual ~scribeIfSingletonFactory() {}
+
+  virtual scribeIf* getHandler(::apache::thrift::server::TConnectionContext*) {
+    return iface_.get();
+  }
+  virtual void releaseHandler(scribeIf* handler) {}
+
+ protected:
+  boost::shared_ptr<scribeIf> iface_;
+};
+
+class scribeNull : virtual public scribeIf {
+ public:
+  virtual ~scribeNull() {}
+  ResultCode Log(const std::vector<LogEntry> & /* messages */) {
+    ResultCode _return = (ResultCode)0;
+    return _return;
+  }
+  void LogMulti(std::vector<ResultCode> & /* _return */, const std::vector<LogEntry> & /* messages */) {
+    return;
+  }
+  ResultCode LogCompressedMsg(const std::string& /* compressedMessages */) {
+    ResultCode _return = (ResultCode)0;
+    return _return;
+  }
+};
+
+class scribe_Log_args {
+ public:
+
+  static const uint64_t _reflection_id = 5902265217339133004U;
+  static void _reflection_register(::apache::thrift::reflection::Schema&);
+  scribe_Log_args() {
+  }
+
+  scribe_Log_args(const scribe_Log_args&) = default;
+  scribe_Log_args& operator=(const scribe_Log_args&) = default;
+  scribe_Log_args(scribe_Log_args&&) = default;
+  scribe_Log_args& operator=(scribe_Log_args&&) = default;
+
+  void __clear() {
+    messages.clear();
+    __isset.__clear();
+  }
+
+  virtual ~scribe_Log_args() throw() {}
+
+  std::vector<LogEntry>  messages;
+
+  struct __isset {
+    __isset() { __clear(); }
+    void __clear() {
+      messages = false;
+    }
+    bool messages;
+  } __isset;
+
+  bool operator == (const scribe_Log_args & rhs) const
+  {
+    if (!(this->messages == rhs.messages))
+      return false;
+    return true;
+  }
+  bool operator != (const scribe_Log_args &rhs) const {
+    return !(*this == rhs);
+  }
+
+  bool operator < (const scribe_Log_args & ) const;
+
+  uint32_t read(apache::thrift::protocol::TProtocol* iprot);
+  uint32_t write(apache::thrift::protocol::TProtocol* oprot) const;
+
+};
+
+class scribe_Log_pargs {
+ public:
+
+  static const uint64_t _reflection_id = 5555604010648986412U;
+  static void _reflection_register(::apache::thrift::reflection::Schema&);
+
+  virtual ~scribe_Log_pargs() throw() {}
+
+  const std::vector<LogEntry> * messages;
+
+  uint32_t write(apache::thrift::protocol::TProtocol* oprot) const;
+
+};
+
+class scribe_Log_result {
+ public:
+
+  static const uint64_t _reflection_id = 18205781396971565932U;
+  static void _reflection_register(::apache::thrift::reflection::Schema&);
+  scribe_Log_result() : success(static_cast<ResultCode>(0)) {
+  }
+
+  scribe_Log_result(const scribe_Log_result&) = default;
+  scribe_Log_result& operator=(const scribe_Log_result&) = default;
+  scribe_Log_result(scribe_Log_result&&) = default;
+  scribe_Log_result& operator=(scribe_Log_result&&) = default;
+
+  void __clear() {
+    success = static_cast<ResultCode>(0);
+    __isset.__clear();
+  }
+
+  virtual ~scribe_Log_result() throw() {}
+
+  ResultCode success;
+
+  struct __isset {
+    __isset() { __clear(); }
+    void __clear() {
+      success = false;
+    }
+    bool success;
+  } __isset;
+
+  bool operator == (const scribe_Log_result & rhs) const
+  {
+    if (!(this->success == rhs.success))
+      return false;
+    return true;
+  }
+  bool operator != (const scribe_Log_result &rhs) const {
+    return !(*this == rhs);
+  }
+
+  bool operator < (const scribe_Log_result & ) const;
+
+  uint32_t read(apache::thrift::protocol::TProtocol* iprot);
+  uint32_t write(apache::thrift::protocol::TProtocol* oprot) const;
+
+};
+
+class scribe_Log_presult {
+ public:
+
+  static const uint64_t _reflection_id = 12945584136895385836U;
+  static void _reflection_register(::apache::thrift::reflection::Schema&);
+
+  virtual ~scribe_Log_presult() throw() {}
+
+  ResultCode* success;
+
+  struct __isset {
+    __isset() { __clear(); }
+    void __clear() {
+      success = false;
+    }
+    bool success;
+  } __isset;
+
+  uint32_t read(apache::thrift::protocol::TProtocol* iprot);
+
+};
+
+class scribe_LogMulti_args {
+ public:
+
+  static const uint64_t _reflection_id = 7590876486278061516U;
+  static void _reflection_register(::apache::thrift::reflection::Schema&);
+  scribe_LogMulti_args() {
+  }
+
+  scribe_LogMulti_args(const scribe_LogMulti_args&) = default;
+  scribe_LogMulti_args& operator=(const scribe_LogMulti_args&) = default;
+  scribe_LogMulti_args(scribe_LogMulti_args&&) = default;
+  scribe_LogMulti_args& operator=(scribe_LogMulti_args&&) = default;
+
+  void __clear() {
+    messages.clear();
+    __isset.__clear();
+  }
+
+  virtual ~scribe_LogMulti_args() throw() {}
+
+  std::vector<LogEntry>  messages;
+
+  struct __isset {
+    __isset() { __clear(); }
+    void __clear() {
+      messages = false;
+    }
+    bool messages;
+  } __isset;
+
+  bool operator == (const scribe_LogMulti_args & rhs) const
+  {
+    if (!(this->messages == rhs.messages))
+      return false;
+    return true;
+  }
+  bool operator != (const scribe_LogMulti_args &rhs) const {
+    return !(*this == rhs);
+  }
+
+  bool operator < (const scribe_LogMulti_args & ) const;
+
+  uint32_t read(apache::thrift::protocol::TProtocol* iprot);
+  uint32_t write(apache::thrift::protocol::TProtocol* oprot) const;
+
+};
+
+class scribe_LogMulti_pargs {
+ public:
+
+  static const uint64_t _reflection_id = 9124384543551655628U;
+  static void _reflection_register(::apache::thrift::reflection::Schema&);
+
+  virtual ~scribe_LogMulti_pargs() throw() {}
+
+  const std::vector<LogEntry> * messages;
+
+  uint32_t write(apache::thrift::protocol::TProtocol* oprot) const;
+
+};
+
+class scribe_LogMulti_result {
+ public:
+
+  static const uint64_t _reflection_id = 4828367046341273164U;
+  static void _reflection_register(::apache::thrift::reflection::Schema&);
+  scribe_LogMulti_result() {
+  }
+
+  scribe_LogMulti_result(const scribe_LogMulti_result&) = default;
+  scribe_LogMulti_result& operator=(const scribe_LogMulti_result&) = default;
+  scribe_LogMulti_result(scribe_LogMulti_result&&) = default;
+  scribe_LogMulti_result& operator=(scribe_LogMulti_result&&) = default;
+
+  void __clear() {
+    success.clear();
+    __isset.__clear();
+  }
+
+  virtual ~scribe_LogMulti_result() throw() {}
+
+  std::vector<ResultCode>  success;
+
+  struct __isset {
+    __isset() { __clear(); }
+    void __clear() {
+      success = false;
+    }
+    bool success;
+  } __isset;
+
+  bool operator == (const scribe_LogMulti_result & rhs) const
+  {
+    if (!(this->success == rhs.success))
+      return false;
+    return true;
+  }
+  bool operator != (const scribe_LogMulti_result &rhs) const {
+    return !(*this == rhs);
+  }
+
+  bool operator < (const scribe_LogMulti_result & ) const;
+
+  uint32_t read(apache::thrift::protocol::TProtocol* iprot);
+  uint32_t write(apache::thrift::protocol::TProtocol* oprot) const;
+
+};
+
+class scribe_LogMulti_presult {
+ public:
+
+  static const uint64_t _reflection_id = 5642041737363050316U;
+  static void _reflection_register(::apache::thrift::reflection::Schema&);
+
+  virtual ~scribe_LogMulti_presult() throw() {}
+
+  std::vector<ResultCode> * success;
+
+  struct __isset {
+    __isset() { __clear(); }
+    void __clear() {
+      success = false;
+    }
+    bool success;
+  } __isset;
+
+  uint32_t read(apache::thrift::protocol::TProtocol* iprot);
+
+};
+
+class scribe_LogCompressedMsg_args {
+ public:
+
+  static const uint64_t _reflection_id = 12705053036625273964U;
+  static void _reflection_register(::apache::thrift::reflection::Schema&);
+  scribe_LogCompressedMsg_args() : compressedMessages("") {
+  }
+
+  scribe_LogCompressedMsg_args(const scribe_LogCompressedMsg_args&) = default;
+  scribe_LogCompressedMsg_args& operator=(const scribe_LogCompressedMsg_args&) = default;
+  scribe_LogCompressedMsg_args(scribe_LogCompressedMsg_args&&) = default;
+  scribe_LogCompressedMsg_args& operator=(scribe_LogCompressedMsg_args&&) = default;
+
+  void __clear() {
+    compressedMessages = "";
+    __isset.__clear();
+  }
+
+  virtual ~scribe_LogCompressedMsg_args() throw() {}
+
+  std::string compressedMessages;
+
+  struct __isset {
+    __isset() { __clear(); }
+    void __clear() {
+      compressedMessages = false;
+    }
+    bool compressedMessages;
+  } __isset;
+
+  bool operator == (const scribe_LogCompressedMsg_args & rhs) const
+  {
+    if (!(this->compressedMessages == rhs.compressedMessages))
+      return false;
+    return true;
+  }
+  bool operator != (const scribe_LogCompressedMsg_args &rhs) const {
+    return !(*this == rhs);
+  }
+
+  bool operator < (const scribe_LogCompressedMsg_args & ) const;
+
+  uint32_t read(apache::thrift::protocol::TProtocol* iprot);
+  uint32_t write(apache::thrift::protocol::TProtocol* oprot) const;
+
+};
+
+class scribe_LogCompressedMsg_pargs {
+ public:
+
+  static const uint64_t _reflection_id = 13645577436870531500U;
+  static void _reflection_register(::apache::thrift::reflection::Schema&);
+
+  virtual ~scribe_LogCompressedMsg_pargs() throw() {}
+
+  const std::string* compressedMessages;
+
+  uint32_t write(apache::thrift::protocol::TProtocol* oprot) const;
+
+};
+
+class scribe_LogCompressedMsg_result {
+ public:
+
+  static const uint64_t _reflection_id = 15026639991904524972U;
+  static void _reflection_register(::apache::thrift::reflection::Schema&);
+  scribe_LogCompressedMsg_result() : success(static_cast<ResultCode>(0)) {
+  }
+
+  scribe_LogCompressedMsg_result(const scribe_LogCompressedMsg_result&) = default;
+  scribe_LogCompressedMsg_result& operator=(const scribe_LogCompressedMsg_result&) = default;
+  scribe_LogCompressedMsg_result(scribe_LogCompressedMsg_result&&) = default;
+  scribe_LogCompressedMsg_result& operator=(scribe_LogCompressedMsg_result&&) = default;
+
+  void __clear() {
+    success = static_cast<ResultCode>(0);
+    __isset.__clear();
+  }
+
+  virtual ~scribe_LogCompressedMsg_result() throw() {}
+
+  ResultCode success;
+
+  struct __isset {
+    __isset() { __clear(); }
+    void __clear() {
+      success = false;
+    }
+    bool success;
+  } __isset;
+
+  bool operator == (const scribe_LogCompressedMsg_result & rhs) const
+  {
+    if (!(this->success == rhs.success))
+      return false;
+    return true;
+  }
+  bool operator != (const scribe_LogCompressedMsg_result &rhs) const {
+    return !(*this == rhs);
+  }
+
+  bool operator < (const scribe_LogCompressedMsg_result & ) const;
+
+  uint32_t read(apache::thrift::protocol::TProtocol* iprot);
+  uint32_t write(apache::thrift::protocol::TProtocol* oprot) const;
+
+};
+
+class scribe_LogCompressedMsg_presult {
+ public:
+
+  static const uint64_t _reflection_id = 5311776576442573772U;
+  static void _reflection_register(::apache::thrift::reflection::Schema&);
+
+  virtual ~scribe_LogCompressedMsg_presult() throw() {}
+
+  ResultCode* success;
+
+  struct __isset {
+    __isset() { __clear(); }
+    void __clear() {
+      success = false;
+    }
+    bool success;
+  } __isset;
+
+  uint32_t read(apache::thrift::protocol::TProtocol* iprot);
+
+};
+
+class scribeClient : virtual public scribeIf, virtual public apache::thrift::TClientBase {
+ public:
+  scribeClient(boost::shared_ptr<apache::thrift::protocol::TProtocol> prot) :
+    checkSeqid_(true),
+    nextSendSequenceId_(1),
+    nextRecvSequenceId_(1),
+    piprot_(prot),
+    poprot_(prot) {
+    iprot_ = prot.get();
+    oprot_ = prot.get();
+  }
+  scribeClient(boost::shared_ptr<apache::thrift::protocol::TProtocol> iprot, boost::shared_ptr<apache::thrift::protocol::TProtocol> oprot) :
+    checkSeqid_(true),
+    nextSendSequenceId_(1),
+    nextRecvSequenceId_(1),
+    piprot_(iprot),
+    poprot_(oprot) {
+    iprot_ = iprot.get();
+    oprot_ = oprot.get();
+  }
+  boost::shared_ptr<apache::thrift::protocol::TProtocol> getInputProtocol() {
+    return piprot_;
+  }
+  boost::shared_ptr<apache::thrift::protocol::TProtocol> getOutputProtocol() {
+    return poprot_;
+  }
+  ResultCode Log(const std::vector<LogEntry> & messages);
+  void send_Log(const std::vector<LogEntry> & messages);
+  ResultCode recv_Log();
+  void LogMulti(std::vector<ResultCode> & _return, const std::vector<LogEntry> & messages);
+  void send_LogMulti(const std::vector<LogEntry> & messages);
+  void recv_LogMulti(std::vector<ResultCode> & _return);
+  ResultCode LogCompressedMsg(const std::string& compressedMessages);
+  void send_LogCompressedMsg(const std::string& compressedMessages);
+  ResultCode recv_LogCompressedMsg();
+
+  /**
+   * Disable checking the seqid field in server responses.
+   *
+   * This should only be used with broken servers that return incorrect seqid values.
+   */
+  void _disableSequenceIdChecks() {
+    checkSeqid_ = false;
+  }
+
+ protected:
+  bool checkSeqid_;
+  int32_t nextSendSequenceId_;
+  int32_t nextRecvSequenceId_;
+  int32_t getNextSendSequenceId();
+  int32_t getNextRecvSequenceId();
+  boost::shared_ptr<apache::thrift::protocol::TProtocol> piprot_;
+  boost::shared_ptr<apache::thrift::protocol::TProtocol> poprot_;
+  apache::thrift::protocol::TProtocol* iprot_;
+  apache::thrift::protocol::TProtocol* oprot_;
+};
+
+class scribeProcessor : public ::apache::thrift::TDispatchProcessor {
+ protected:
+  boost::shared_ptr<scribeIf> iface_;
+  virtual bool dispatchCall(apache::thrift::protocol::TProtocol* iprot, apache::thrift::protocol::TProtocol* oprot, const std::string& fname, int32_t seqid, apache::thrift::server::TConnectionContext* connectionContext);
+ private:
+  typedef  void (scribeProcessor::*ProcessFunction)(int32_t, apache::thrift::protocol::TProtocol*, apache::thrift::protocol::TProtocol*, apache::thrift::server::TConnectionContext*);
+  typedef std::map<std::string, ProcessFunction> ProcessMap;
+  ProcessMap processMap_;
+  void process_Log(int32_t seqid, apache::thrift::protocol::TProtocol* iprot, apache::thrift::protocol::TProtocol* oprot, apache::thrift::server::TConnectionContext* connectionContext);
+  void process_LogMulti(int32_t seqid, apache::thrift::protocol::TProtocol* iprot, apache::thrift::protocol::TProtocol* oprot, apache::thrift::server::TConnectionContext* connectionContext);
+  void process_LogCompressedMsg(int32_t seqid, apache::thrift::protocol::TProtocol* iprot, apache::thrift::protocol::TProtocol* oprot, apache::thrift::server::TConnectionContext* connectionContext);
+ public:
+  scribeProcessor(boost::shared_ptr<scribeIf> iface) :
+    iface_(iface) {
+    processMap_["Log"] = &scribeProcessor::process_Log;
+    processMap_["LogMulti"] = &scribeProcessor::process_LogMulti;
+    processMap_["LogCompressedMsg"] = &scribeProcessor::process_LogCompressedMsg;
+  }
+
+  virtual ~scribeProcessor() {}
+
+  boost::shared_ptr<std::set<std::string> > getProcessFunctions() {
+    boost::shared_ptr<std::set<std::string> > rSet(new std::set<std::string>());
+    rSet->insert("scribe.Log");
+    rSet->insert("scribe.LogMulti");
+    rSet->insert("scribe.LogCompressedMsg");
+    return rSet;
+  }
+};
+
+class scribeProcessorFactory : public ::apache::thrift::TProcessorFactory {
+ public:
+  scribeProcessorFactory(const ::boost::shared_ptr< scribeIfFactory >& handlerFactory) :
+      handlerFactory_(handlerFactory) {}
+
+  ::boost::shared_ptr< ::apache::thrift::TProcessor > getProcessor(::apache::thrift::server::TConnectionContext* ctx);
+
+ protected:
+  ::boost::shared_ptr< scribeIfFactory > handlerFactory_;
+};
+
+class scribeMultiface : virtual public scribeIf {
+ public:
+  scribeMultiface(std::vector<boost::shared_ptr<scribeIf> >& ifaces) : ifaces_(ifaces) {
+  }
+  virtual ~scribeMultiface() {}
+ protected:
+  std::vector<boost::shared_ptr<scribeIf> > ifaces_;
+  scribeMultiface() {}
+  void add(boost::shared_ptr<scribeIf> iface) {
+    ifaces_.push_back(iface);
+  }
+ public:
+  ResultCode Log(const std::vector<LogEntry> & messages) {
+    uint32_t i;
+    uint32_t sz = ifaces_.size();
+    for (i = 0; i < sz - 1; ++i) {
+      ifaces_[i]->Log(messages);
+    }
+    return ifaces_[i]->Log(messages);
+  }
+
+  void LogMulti(std::vector<ResultCode> & _return, const std::vector<LogEntry> & messages) {
+    uint32_t i;
+    uint32_t sz = ifaces_.size();
+    for (i = 0; i < sz; ++i) {
+      ifaces_[i]->LogMulti(_return, messages);
+    }
+  }
+
+  ResultCode LogCompressedMsg(const std::string& compressedMessages) {
+    uint32_t i;
+    uint32_t sz = ifaces_.size();
+    for (i = 0; i < sz - 1; ++i) {
+      ifaces_[i]->LogCompressedMsg(compressedMessages);
+    }
+    return ifaces_[i]->LogCompressedMsg(compressedMessages);
+  }
+
+};
+
+} // namespace
+
+#endif
--- a/scribe/if/gen-cpp/scribe_constants.cpp
+++ b/scribe/if/gen-cpp/scribe_constants.cpp
@ -0,0 +1,17 @@
+/**
+ * Autogenerated by Thrift
+ *
+ * DO NOT EDIT UNLESS YOU ARE SURE THAT YOU KNOW WHAT YOU ARE DOING
+ *  @generated
+ */
+#include "scribe_constants.h"
+
+namespace Tleveldb {
+
+const scribeConstants g_scribe_constants;
+
+scribeConstants::scribeConstants() {
+  SCRIBE_MAX_MESSAGE_LENGTH = 26214400;
+}
+
+} // namespace
--- a/scribe/if/gen-cpp/scribe_constants.h
+++ b/scribe/if/gen-cpp/scribe_constants.h
@ -0,0 +1,25 @@
+/**
+ * Autogenerated by Thrift
+ *
+ * DO NOT EDIT UNLESS YOU ARE SURE THAT YOU KNOW WHAT YOU ARE DOING
+ *  @generated
+ */
+#ifndef scribe_CONSTANTS_H
+#define scribe_CONSTANTS_H
+
+#include "scribe_types.h"
+
+namespace Tleveldb {
+
+class scribeConstants {
+ public:
+  scribeConstants();
+
+  int32_t SCRIBE_MAX_MESSAGE_LENGTH;
+};
+
+extern const scribeConstants g_scribe_constants;
+
+} // namespace
+
+#endif
--- a/scribe/if/gen-cpp/scribe_types.cpp
+++ b/scribe/if/gen-cpp/scribe_types.cpp
@ -0,0 +1,513 @@
+/**
+ * Autogenerated by Thrift
+ *
+ * DO NOT EDIT UNLESS YOU ARE SURE THAT YOU KNOW WHAT YOU ARE DOING
+ *  @generated
+ */
+#include "scribe_types.h"
+
+#include <thrift/lib/cpp/Reflection.h>
+#include <algorithm>
+#include <string.h>
+
+namespace Tleveldb {
+
+int _kResultCodeValues[] = {
+  OK,
+  TRY_LATER,
+  ERROR_DECOMPRESS
+};
+
+const char* _kResultCodeNames[] = {
+  "OK",
+  "TRY_LATER",
+  "ERROR_DECOMPRESS"
+};
+
+const std::map<int, const char*> _ResultCode_VALUES_TO_NAMES(apache::thrift::TEnumIterator<int>(3, _kResultCodeValues, _kResultCodeNames), apache::thrift::TEnumIterator<int>(-1, NULL, NULL));
+
+const std::map<const char*, int, apache::thrift::ltstr> _ResultCode_NAMES_TO_VALUES(apache::thrift::TEnumInverseIterator<int>(3, _kResultCodeValues, _kResultCodeNames), apache::thrift::TEnumInverseIterator<int>(-1, NULL, NULL));
+
+} // namespace
+namespace apache { namespace thrift {
+template<>
+const char* TEnumTraits< ::Tleveldb::ResultCode>::findName( ::Tleveldb::ResultCode value) {
+return findName( ::Tleveldb::_ResultCode_VALUES_TO_NAMES, value);
+}
+
+template<>
+bool TEnumTraits< ::Tleveldb::ResultCode>::findValue(const char* name,  ::Tleveldb::ResultCode* out) {
+return findValue( ::Tleveldb::_ResultCode_NAMES_TO_VALUES, name, out);
+}
+}} // apache::thrift
+
+namespace Tleveldb {
+// Reflection initializer for struct scribe.SourceInfo
+namespace {
+void reflectionInitializer_16557823557777806572(::apache::thrift::reflection::Schema& schema) {
+  const uint64_t id = 16557823557777806572U;
+  if (schema.dataTypes.count(id)) return;
+  ::apache::thrift::reflection::DataType dt;
+  dt.name = "struct scribe.SourceInfo";
+    dt.__isset.fields = true;
+  {
+    ::apache::thrift::reflection::StructField f;
+    f.isRequired = true;
+    f.type = 1U;
+    f.name = "host";
+    dt.fields[1] = f;
+  }
+  {
+    ::apache::thrift::reflection::StructField f;
+    f.isRequired = true;
+    f.type = 5U;
+    f.name = "port";
+    dt.fields[2] = f;
+  }
+  {
+    ::apache::thrift::reflection::StructField f;
+    f.isRequired = true;
+    f.type = 6U;
+    f.name = "timestamp";
+    dt.fields[3] = f;
+  }
+  schema.dataTypes[id] = dt;
+  schema.names[dt.name] = id;
+}
+}  // namespace
+
+const uint64_t SourceInfo::_reflection_id;
+void SourceInfo::_reflection_register(::apache::thrift::reflection::Schema& schema) {
+  reflectionInitializer_16557823557777806572(schema);
+}
+uint32_t SourceInfo::read(apache::thrift::protocol::TProtocol* iprot) {
+
+  uint32_t xfer = 0;
+  std::string fname;
+  apache::thrift::protocol::TType ftype;
+  int16_t fid;
+
+  xfer += iprot->readStructBegin(fname);
+
+  using apache::thrift::protocol::TProtocolException;
+
+
+  while (true)
+  {
+    xfer += iprot->readFieldBegin(fname, ftype, fid);
+    if (ftype == apache::thrift::protocol::T_STOP) {
+      break;
+    }
+    switch (fid)
+    {
+      case 1:
+        if (ftype == apache::thrift::protocol::T_STRING) {
+          xfer += iprot->readBinary(this->host);
+          this->__isset.host = true;
+        } else {
+          xfer += iprot->skip(ftype);
+        }
+        break;
+      case 2:
+        if (ftype == apache::thrift::protocol::T_I32) {
+          xfer += iprot->readI32(this->port);
+          this->__isset.port = true;
+        } else {
+          xfer += iprot->skip(ftype);
+        }
+        break;
+      case 3:
+        if (ftype == apache::thrift::protocol::T_I64) {
+          xfer += iprot->readI64(this->timestamp);
+          this->__isset.timestamp = true;
+        } else {
+          xfer += iprot->skip(ftype);
+        }
+        break;
+      default:
+        xfer += iprot->skip(ftype);
+        break;
+    }
+    xfer += iprot->readFieldEnd();
+  }
+
+  xfer += iprot->readStructEnd();
+
+  return xfer;
+}
+
+uint32_t SourceInfo::write(apache::thrift::protocol::TProtocol* oprot) const {
+  uint32_t xfer = 0;
+  xfer += oprot->writeStructBegin("SourceInfo");
+  xfer += oprot->writeFieldBegin("host", apache::thrift::protocol::T_STRING, 1);
+  xfer += oprot->writeBinary(this->host);
+  xfer += oprot->writeFieldEnd();
+  xfer += oprot->writeFieldBegin("port", apache::thrift::protocol::T_I32, 2);
+  xfer += oprot->writeI32(this->port);
+  xfer += oprot->writeFieldEnd();
+  xfer += oprot->writeFieldBegin("timestamp", apache::thrift::protocol::T_I64, 3);
+  xfer += oprot->writeI64(this->timestamp);
+  xfer += oprot->writeFieldEnd();
+  xfer += oprot->writeFieldStop();
+  xfer += oprot->writeStructEnd();
+  return xfer;
+}
+
+void swap(SourceInfo &a, SourceInfo &b) {
+  using ::std::swap;
+  (void)a;
+  (void)b;
+  swap(a.host, b.host);
+  swap(a.port, b.port);
+  swap(a.timestamp, b.timestamp);
+  swap(a.__isset, b.__isset);
+}
+
+// Reflection initializer for map<string, string>
+namespace {
+void reflectionInitializer_9246346592659763371(::apache::thrift::reflection::Schema& schema) {
+  const uint64_t id = 9246346592659763371U;
+  if (schema.dataTypes.count(id)) return;
+  ::apache::thrift::reflection::DataType dt;
+  dt.name = "map<string, string>";
+  dt.__isset.mapKeyType = true;
+  dt.mapKeyType = 1U;
+  dt.__isset.valueType = true;
+  dt.valueType = 1U;
+  schema.dataTypes[id] = dt;
+  schema.names[dt.name] = id;
+}
+}  // namespace
+
+// Reflection initializer for struct scribe.LogEntry
+namespace {
+void reflectionInitializer_15053466696968532300(::apache::thrift::reflection::Schema& schema) {
+  const uint64_t id = 15053466696968532300U;
+  if (schema.dataTypes.count(id)) return;
+  reflectionInitializer_16557823557777806572(schema);  // struct scribe.SourceInfo
+  reflectionInitializer_9246346592659763371(schema);  // map<string, string>
+  ::apache::thrift::reflection::DataType dt;
+  dt.name = "struct scribe.LogEntry";
+    dt.__isset.fields = true;
+  {
+    ::apache::thrift::reflection::StructField f;
+    f.isRequired = true;
+    f.type = 1U;
+    f.name = "category";
+    dt.fields[1] = f;
+  }
+  {
+    ::apache::thrift::reflection::StructField f;
+    f.isRequired = true;
+    f.type = 1U;
+    f.name = "message";
+    dt.fields[2] = f;
+  }
+  {
+    ::apache::thrift::reflection::StructField f;
+    f.isRequired = false;
+    f.type = 9246346592659763371U;
+    f.name = "metadata";
+    dt.fields[3] = f;
+  }
+  {
+    ::apache::thrift::reflection::StructField f;
+    f.isRequired = false;
+    f.type = 5U;
+    f.name = "checksum";
+    dt.fields[4] = f;
+  }
+  {
+    ::apache::thrift::reflection::StructField f;
+    f.isRequired = false;
+    f.type = 16557823557777806572U;
+    f.name = "source";
+    dt.fields[5] = f;
+  }
+  {
+    ::apache::thrift::reflection::StructField f;
+    f.isRequired = false;
+    f.type = 5U;
+    f.name = "bucket";
+    dt.fields[6] = f;
+  }
+  schema.dataTypes[id] = dt;
+  schema.names[dt.name] = id;
+}
+}  // namespace
+
+const uint64_t LogEntry::_reflection_id;
+void LogEntry::_reflection_register(::apache::thrift::reflection::Schema& schema) {
+  reflectionInitializer_15053466696968532300(schema);
+}
+uint32_t LogEntry::read(apache::thrift::protocol::TProtocol* iprot) {
+
+  uint32_t xfer = 0;
+  std::string fname;
+  apache::thrift::protocol::TType ftype;
+  int16_t fid;
+
+  xfer += iprot->readStructBegin(fname);
+
+  using apache::thrift::protocol::TProtocolException;
+
+
+  while (true)
+  {
+    xfer += iprot->readFieldBegin(fname, ftype, fid);
+    if (ftype == apache::thrift::protocol::T_STOP) {
+      break;
+    }
+    switch (fid)
+    {
+      case 1:
+        if (ftype == apache::thrift::protocol::T_STRING) {
+          xfer += iprot->readBinary(this->category);
+          this->__isset.category = true;
+        } else {
+          xfer += iprot->skip(ftype);
+        }
+        break;
+      case 2:
+        if (ftype == apache::thrift::protocol::T_STRING) {
+          xfer += iprot->readBinary(this->message);
+          this->__isset.message = true;
+        } else {
+          xfer += iprot->skip(ftype);
+        }
+        break;
+      case 3:
+        if (ftype == apache::thrift::protocol::T_MAP) {
+          {
+            this->metadata.clear();
+            uint32_t _size0;
+            apache::thrift::protocol::TType _ktype1;
+            apache::thrift::protocol::TType _vtype2;
+            xfer += iprot->readMapBegin(_ktype1, _vtype2, _size0);
+            uint32_t _i4;
+            for (_i4 = 0; _i4 < _size0; ++_i4)
+            {
+              std::string _key5;
+              xfer += iprot->readString(_key5);
+              std::string& _val6 = this->metadata[_key5];
+              xfer += iprot->readString(_val6);
+            }
+            xfer += iprot->readMapEnd();
+          }
+          this->__isset.metadata = true;
+        } else {
+          xfer += iprot->skip(ftype);
+        }
+        break;
+      case 4:
+        if (ftype == apache::thrift::protocol::T_I32) {
+          xfer += iprot->readI32(this->checksum);
+          this->__isset.checksum = true;
+        } else {
+          xfer += iprot->skip(ftype);
+        }
+        break;
+      case 5:
+        if (ftype == apache::thrift::protocol::T_STRUCT) {
+          xfer += this->source.read(iprot);
+          this->__isset.source = true;
+        } else {
+          xfer += iprot->skip(ftype);
+        }
+        break;
+      case 6:
+        if (ftype == apache::thrift::protocol::T_I32) {
+          xfer += iprot->readI32(this->bucket);
+          this->__isset.bucket = true;
+        } else {
+          xfer += iprot->skip(ftype);
+        }
+        break;
+      default:
+        xfer += iprot->skip(ftype);
+        break;
+    }
+    xfer += iprot->readFieldEnd();
+  }
+
+  xfer += iprot->readStructEnd();
+
+  return xfer;
+}
+
+uint32_t LogEntry::write(apache::thrift::protocol::TProtocol* oprot) const {
+  uint32_t xfer = 0;
+  xfer += oprot->writeStructBegin("LogEntry");
+  xfer += oprot->writeFieldBegin("category", apache::thrift::protocol::T_STRING, 1);
+  xfer += oprot->writeBinary(this->category);
+  xfer += oprot->writeFieldEnd();
+  xfer += oprot->writeFieldBegin("message", apache::thrift::protocol::T_STRING, 2);
+  xfer += oprot->writeBinary(this->message);
+  xfer += oprot->writeFieldEnd();
+  if (this->__isset.metadata) {
+    xfer += oprot->writeFieldBegin("metadata", apache::thrift::protocol::T_MAP, 3);
+    {
+      xfer += oprot->writeMapBegin(apache::thrift::protocol::T_STRING, apache::thrift::protocol::T_STRING, this->metadata.size());
+      std::map<std::string, std::string> ::const_iterator _iter7;
+      for (_iter7 = this->metadata.begin(); _iter7 != this->metadata.end(); ++_iter7)
+      {
+        xfer += oprot->writeString(_iter7->first);
+        xfer += oprot->writeString(_iter7->second);
+      }
+      xfer += oprot->writeMapEnd();
+    }
+    xfer += oprot->writeFieldEnd();
+  }
+  if (this->__isset.checksum) {
+    xfer += oprot->writeFieldBegin("checksum", apache::thrift::protocol::T_I32, 4);
+    xfer += oprot->writeI32(this->checksum);
+    xfer += oprot->writeFieldEnd();
+  }
+  if (this->__isset.source) {
+    xfer += oprot->writeFieldBegin("source", apache::thrift::protocol::T_STRUCT, 5);
+    xfer += this->source.write(oprot);
+    xfer += oprot->writeFieldEnd();
+  }
+  if (this->__isset.bucket) {
+    xfer += oprot->writeFieldBegin("bucket", apache::thrift::protocol::T_I32, 6);
+    xfer += oprot->writeI32(this->bucket);
+    xfer += oprot->writeFieldEnd();
+  }
+  xfer += oprot->writeFieldStop();
+  xfer += oprot->writeStructEnd();
+  return xfer;
+}
+
+void swap(LogEntry &a, LogEntry &b) {
+  using ::std::swap;
+  (void)a;
+  (void)b;
+  swap(a.category, b.category);
+  swap(a.message, b.message);
+  swap(a.metadata, b.metadata);
+  swap(a.checksum, b.checksum);
+  swap(a.source, b.source);
+  swap(a.bucket, b.bucket);
+  swap(a.__isset, b.__isset);
+}
+
+// Reflection initializer for list<struct scribe.LogEntry>
+namespace {
+void reflectionInitializer_10251729064312664553(::apache::thrift::reflection::Schema& schema) {
+  const uint64_t id = 10251729064312664553U;
+  if (schema.dataTypes.count(id)) return;
+  reflectionInitializer_15053466696968532300(schema);  // struct scribe.LogEntry
+  ::apache::thrift::reflection::DataType dt;
+  dt.name = "list<struct scribe.LogEntry>";
+  dt.__isset.valueType = true;
+  dt.valueType = 15053466696968532300U;
+  schema.dataTypes[id] = dt;
+  schema.names[dt.name] = id;
+}
+}  // namespace
+
+// Reflection initializer for struct scribe.MessageList
+namespace {
+void reflectionInitializer_5674270912483072844(::apache::thrift::reflection::Schema& schema) {
+  const uint64_t id = 5674270912483072844U;
+  if (schema.dataTypes.count(id)) return;
+  reflectionInitializer_10251729064312664553(schema);  // list<struct scribe.LogEntry>
+  ::apache::thrift::reflection::DataType dt;
+  dt.name = "struct scribe.MessageList";
+    dt.__isset.fields = true;
+  {
+    ::apache::thrift::reflection::StructField f;
+    f.isRequired = true;
+    f.type = 10251729064312664553U;
+    f.name = "messages";
+    dt.fields[1] = f;
+  }
+  schema.dataTypes[id] = dt;
+  schema.names[dt.name] = id;
+}
+}  // namespace
+
+const uint64_t MessageList::_reflection_id;
+void MessageList::_reflection_register(::apache::thrift::reflection::Schema& schema) {
+  reflectionInitializer_5674270912483072844(schema);
+}
+uint32_t MessageList::read(apache::thrift::protocol::TProtocol* iprot) {
+
+  uint32_t xfer = 0;
+  std::string fname;
+  apache::thrift::protocol::TType ftype;
+  int16_t fid;
+
+  xfer += iprot->readStructBegin(fname);
+
+  using apache::thrift::protocol::TProtocolException;
+
+
+  while (true)
+  {
+    xfer += iprot->readFieldBegin(fname, ftype, fid);
+    if (ftype == apache::thrift::protocol::T_STOP) {
+      break;
+    }
+    switch (fid)
+    {
+      case 1:
+        if (ftype == apache::thrift::protocol::T_LIST) {
+          {
+            this->messages.clear();
+            uint32_t _size8;
+            apache::thrift::protocol::TType _etype11;
+            xfer += iprot->readListBegin(_etype11, _size8);
+            this->messages.resize(_size8);
+            uint32_t _i12;
+            for (_i12 = 0; _i12 < _size8; ++_i12)
+            {
+              xfer += this->messages[_i12].read(iprot);
+            }
+            xfer += iprot->readListEnd();
+          }
+          this->__isset.messages = true;
+        } else {
+          xfer += iprot->skip(ftype);
+        }
+        break;
+      default:
+        xfer += iprot->skip(ftype);
+        break;
+    }
+    xfer += iprot->readFieldEnd();
+  }
+
+  xfer += iprot->readStructEnd();
+
+  return xfer;
+}
+
+uint32_t MessageList::write(apache::thrift::protocol::TProtocol* oprot) const {
+  uint32_t xfer = 0;
+  xfer += oprot->writeStructBegin("MessageList");
+  xfer += oprot->writeFieldBegin("messages", apache::thrift::protocol::T_LIST, 1);
+  {
+    xfer += oprot->writeListBegin(apache::thrift::protocol::T_STRUCT, this->messages.size());
+    std::vector<LogEntry> ::const_iterator _iter13;
+    for (_iter13 = this->messages.begin(); _iter13 != this->messages.end(); ++_iter13)
+    {
+      xfer += (*_iter13).write(oprot);
+    }
+    xfer += oprot->writeListEnd();
+  }
+  xfer += oprot->writeFieldEnd();
+  xfer += oprot->writeFieldStop();
+  xfer += oprot->writeStructEnd();
+  return xfer;
+}
+
+void swap(MessageList &a, MessageList &b) {
+  using ::std::swap;
+  (void)a;
+  (void)b;
+  swap(a.messages, b.messages);
+  swap(a.__isset, b.__isset);
+}
+
+} // namespace
--- a/scribe/if/gen-cpp/scribe_types.h
+++ b/scribe/if/gen-cpp/scribe_types.h
@ -0,0 +1,247 @@
+/**
+ * Autogenerated by Thrift
+ *
+ * DO NOT EDIT UNLESS YOU ARE SURE THAT YOU KNOW WHAT YOU ARE DOING
+ *  @generated
+ */
+#ifndef scribe_TYPES_H
+#define scribe_TYPES_H
+
+#include <Thrift.h>
+#include <TApplicationException.h>
+#include <protocol/TProtocol.h>
+#include <transport/TTransport.h>
+
+namespace apache { namespace thrift { namespace reflection {
+class Schema;
+}}}
+
+
+namespace Tleveldb {
+
+enum ResultCode {
+  OK = 0,
+  TRY_LATER = 1,
+  ERROR_DECOMPRESS = 2
+};
+
+extern const std::map<int, const char*> _ResultCode_VALUES_TO_NAMES;
+
+extern const std::map<const char*, int, apache::thrift::ltstr> _ResultCode_NAMES_TO_VALUES;
+
+} // namespace
+namespace apache { namespace thrift {
+template<>
+inline constexpr  ::Tleveldb::ResultCode TEnumTraits< ::Tleveldb::ResultCode>::min() {
+return  ::Tleveldb::ResultCode::OK;
+}
+template<>
+inline constexpr  ::Tleveldb::ResultCode TEnumTraits< ::Tleveldb::ResultCode>::max() {
+return  ::Tleveldb::ResultCode::ERROR_DECOMPRESS;
+}
+}} // apache:thrift
+
+namespace Tleveldb {
+class SourceInfo {
+ public:
+
+  static const uint64_t _reflection_id = 16557823557777806572U;
+  static void _reflection_register(::apache::thrift::reflection::Schema&);
+  SourceInfo() : host(""), port(0), timestamp(0) {
+  }
+
+  SourceInfo(const SourceInfo&) = default;
+  SourceInfo& operator=(const SourceInfo&) = default;
+  SourceInfo(SourceInfo&&) = default;
+  SourceInfo& operator=(SourceInfo&&) = default;
+
+  void __clear() {
+    host = "";
+    port = 0;
+    timestamp = 0;
+    __isset.__clear();
+  }
+
+  virtual ~SourceInfo() throw() {}
+
+  std::string host;
+  int32_t port;
+  int64_t timestamp;
+
+  struct __isset {
+    __isset() { __clear(); }
+    void __clear() {
+      host = false;
+      port = false;
+      timestamp = false;
+    }
+    bool host;
+    bool port;
+    bool timestamp;
+  } __isset;
+
+  bool operator == (const SourceInfo & rhs) const
+  {
+    if (!(this->host == rhs.host))
+      return false;
+    if (!(this->port == rhs.port))
+      return false;
+    if (!(this->timestamp == rhs.timestamp))
+      return false;
+    return true;
+  }
+  bool operator != (const SourceInfo &rhs) const {
+    return !(*this == rhs);
+  }
+
+  bool operator < (const SourceInfo & ) const;
+
+  uint32_t read(apache::thrift::protocol::TProtocol* iprot);
+  uint32_t write(apache::thrift::protocol::TProtocol* oprot) const;
+
+};
+
+class SourceInfo;
+void swap(SourceInfo &a, SourceInfo &b);
+
+class LogEntry {
+ public:
+
+  static const uint64_t _reflection_id = 15053466696968532300U;
+  static void _reflection_register(::apache::thrift::reflection::Schema&);
+  LogEntry() : category(""), message(""), checksum(0), bucket(0) {
+  }
+
+  LogEntry(const LogEntry&) = default;
+  LogEntry& operator=(const LogEntry&) = default;
+  LogEntry(LogEntry&&) = default;
+  LogEntry& operator=(LogEntry&&) = default;
+
+  void __clear() {
+    category = "";
+    message = "";
+    metadata.clear();
+    checksum = 0;
+    source.__clear();
+    bucket = 0;
+    __isset.__clear();
+  }
+
+  virtual ~LogEntry() throw() {}
+
+  std::string category;
+  std::string message;
+  std::map<std::string, std::string>  metadata;
+  int32_t checksum;
+  SourceInfo source;
+  int32_t bucket;
+
+  struct __isset {
+    __isset() { __clear(); }
+    void __clear() {
+      category = false;
+      message = false;
+      metadata = false;
+      checksum = false;
+      source = false;
+      bucket = false;
+    }
+    bool category;
+    bool message;
+    bool metadata;
+    bool checksum;
+    bool source;
+    bool bucket;
+  } __isset;
+
+  bool operator == (const LogEntry & rhs) const
+  {
+    if (!(this->category == rhs.category))
+      return false;
+    if (!(this->message == rhs.message))
+      return false;
+    if (__isset.metadata != rhs.__isset.metadata)
+      return false;
+    else if (__isset.metadata && !(metadata == rhs.metadata))
+      return false;
+    if (__isset.checksum != rhs.__isset.checksum)
+      return false;
+    else if (__isset.checksum && !(checksum == rhs.checksum))
+      return false;
+    if (__isset.source != rhs.__isset.source)
+      return false;
+    else if (__isset.source && !(source == rhs.source))
+      return false;
+    if (__isset.bucket != rhs.__isset.bucket)
+      return false;
+    else if (__isset.bucket && !(bucket == rhs.bucket))
+      return false;
+    return true;
+  }
+  bool operator != (const LogEntry &rhs) const {
+    return !(*this == rhs);
+  }
+
+  bool operator < (const LogEntry & ) const;
+
+  uint32_t read(apache::thrift::protocol::TProtocol* iprot);
+  uint32_t write(apache::thrift::protocol::TProtocol* oprot) const;
+
+};
+
+class LogEntry;
+void swap(LogEntry &a, LogEntry &b);
+
+class MessageList {
+ public:
+
+  static const uint64_t _reflection_id = 5674270912483072844U;
+  static void _reflection_register(::apache::thrift::reflection::Schema&);
+  MessageList() {
+  }
+
+  MessageList(const MessageList&) = default;
+  MessageList& operator=(const MessageList&) = default;
+  MessageList(MessageList&&) = default;
+  MessageList& operator=(MessageList&&) = default;
+
+  void __clear() {
+    messages.clear();
+    __isset.__clear();
+  }
+
+  virtual ~MessageList() throw() {}
+
+  std::vector<LogEntry>  messages;
+
+  struct __isset {
+    __isset() { __clear(); }
+    void __clear() {
+      messages = false;
+    }
+    bool messages;
+  } __isset;
+
+  bool operator == (const MessageList & rhs) const
+  {
+    if (!(this->messages == rhs.messages))
+      return false;
+    return true;
+  }
+  bool operator != (const MessageList &rhs) const {
+    return !(*this == rhs);
+  }
+
+  bool operator < (const MessageList & ) const;
+
+  uint32_t read(apache::thrift::protocol::TProtocol* iprot);
+  uint32_t write(apache::thrift::protocol::TProtocol* oprot) const;
+
+};
+
+class MessageList;
+void swap(MessageList &a, MessageList &b);
+
+} // namespace
+
+#endif
--- a/scribe/if/scribe.thrift
+++ b/scribe/if/scribe.thrift
@ -0,0 +1,82 @@
+#!/usr/local/bin/thrift --cpp --php
+
+##  Copyright (c) 2007-2012 Facebook
+##
+##  Licensed under the Apache License, Version 2.0 (the "License");
+##  you may not use this file except in compliance with the License.
+##  You may obtain a copy of the License at
+##
+##      http://www.apache.org/licenses/LICENSE-2.0
+##
+##  Unless required by applicable law or agreed to in writing, software
+##  distributed under the License is distributed on an "AS IS" BASIS,
+##  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+##  See the License for the specific language governing permissions and
+##  limitations under the License.
+##
+## See accompanying file LICENSE or visit the Scribe site at:
+## http://developers.facebook.com/scribe/
+
+namespace cpp Tleveldb
+namespace java Tleveldb
+
+// Max message length allowed to log through scribe
+const i32 SCRIBE_MAX_MESSAGE_LENGTH = 26214400;
+
+enum ResultCode
+{
+  OK,
+  TRY_LATER,
+  ERROR_DECOMPRESS
+}
+
+struct SourceInfo
+{
+  1:  binary host,
+  2:  i32 port,
+  3:  i64 timestamp
+}
+
+struct LogEntry
+{
+  1:  binary category,
+  2:  binary message,
+  3:  optional map<string, string> metadata,
+  4:  optional i32 checksum,
+  5:  optional SourceInfo source,
+  6:  optional i32 bucket
+}
+
+struct MessageList
+{
+  1: list<LogEntry> messages
+}
+
+service scribe
+{
+  #
+  # Delivers a list of LogEntry messages to the Scribe server.
+  # A returned ResultCode of anything other than OK indicates that the
+  # whole batch was unable to be delivered to the server.
+  # If data loss is a concern, the caller should buffer and retry the messages.
+  #
+  ResultCode Log(1: list<LogEntry> messages);
+
+  #
+  # NOTE: FOR INTERNAL USE ONLY!
+  #
+  # Delivers a list of LogEntry messages to the Scribe server, but
+  # allows partial successes. A list of ResultCodes will be returned to
+  # indicate the success or failure of each message at the corresponding index.
+  # If data loss is a concern, the caller should retry only the failed messages.
+  #
+  list<ResultCode> LogMulti(1: list<LogEntry> messages);
+
+  #
+  # NOTE: FOR INTERNAL USE ONLY!
+  #
+  # The same as Log(...) except that the list of messages must first be
+  # serialized and compressed in some internal format.
+  #
+  ResultCode LogCompressedMsg(1: binary compressedMessages);
+}
--- a/scribe/scribe_logger.cc
+++ b/scribe/scribe_logger.cc
@ -0,0 +1,90 @@
+#include "scribe_logger.h"
+
+namespace leveldb {
+
+const std::string ScribeLogger::COL_SEPERATOR = "\x1";
+const std::string ScribeLogger::DEPLOY_STATS_CATEGORY = "leveldb_deploy_stats";
+
+ScribeLogger::ScribeLogger(const std::string& host, int port,
+    int retry_times, uint32_t retry_intervals, int batch_size)
+  : host_(host),
+    port_(port),
+    retry_times_(retry_times),
+    retry_intervals_ (retry_intervals),
+    batch_size_ (batch_size) {
+  shared_ptr<TSocket> socket(new TSocket(host_, port_));
+  shared_ptr<TFramedTransport> framedTransport(new TFramedTransport(socket));
+  framedTransport->open();
+  shared_ptr<TBinaryProtocol> protocol(new TBinaryProtocol(framedTransport));
+  scribe_client_ = new scribeClient(protocol);
+}
+
+void ScribeLogger::Log(const std::string& category,
+    const std::string& message) {
+  LogEntry entry;
+  entry.category = category;
+  entry.message = message;
+
+  logger_mutex_.Lock();
+  logs_.push_back(entry);
+
+  if (logs_.size() >= batch_size_) {
+    ResultCode  ret = scribe_client_->Log(logs_);
+    int retries_left = retry_times_;
+    while (ret == TRY_LATER && retries_left > 0) {
+      Env::Default()->SleepForMicroseconds(retry_intervals_);
+      ret = scribe_client_->Log(logs_);
+      retries_left--;
+    }
+
+    // Clear the local messages if either successfully write out
+    // or has failed in the last 10 calls.
+    if (ret == OK || logs_.size() > batch_size_ * 5) {
+      logs_.clear();
+    }
+  }
+
+  logger_mutex_.Unlock();
+}
+
+void ScribeLogger::MakeScribeMessage(std::string& output,
+    std::vector<std::string>& cols) {
+  int sz = cols.size();
+  int i = 0;
+  for (; i < sz - 1; i++) {
+    std::string& col = cols.at(i);
+    output += col;
+    output += ScribeLogger::COL_SEPERATOR;
+  }
+  std::string& col = cols.at(i);
+  output+=col;
+}
+
+void ScribeLogger::Log_Deploy_Stats(
+    const std::string& db_version,
+    const std::string& machine_info,
+    const std::string& data_dir,
+    const uint64_t data_size,
+    const uint32_t file_number,
+    const std::string& data_size_per_level,
+    const std::string& file_number_per_level,
+    const int64_t& ts_unix) {
+  std::string message;
+  std::vector<std::string> cols;
+  cols.push_back(db_version);
+  cols.push_back(machine_info);
+  cols.push_back(data_dir);
+  cols.push_back(boost::lexical_cast<std::string>(data_size));
+  cols.push_back(boost::lexical_cast<std::string>(file_number));
+  cols.push_back(data_size_per_level);
+  cols.push_back(file_number_per_level);
+  cols.push_back(boost::lexical_cast<std::string>(ts_unix));
+  MakeScribeMessage(message, cols);
+  return Log(ScribeLogger::DEPLOY_STATS_CATEGORY, message);
+}
+
+ScribeLogger::~ScribeLogger(){
+  delete scribe_client_;
+}
+
+}
--- a/scribe/scribe_logger.h
+++ b/scribe/scribe_logger.h
@ -0,0 +1,71 @@
+#ifndef SCRIBE_LOGGER_H_
+#define SCRIBE_LOGGER_H_
+
+#include "scribe/if/gen-cpp/scribe.h"
+#include "scribe/if/gen-cpp/scribe_types.h"
+#include "thrift/lib/cpp/protocol/TProtocol.h"
+#include "thrift/lib/cpp/transport/TSocket.h"
+#include "thrift/lib/cpp/protocol/TBinaryProtocol.h"
+#include "thrift/lib/cpp/transport/TBufferTransports.h"
+
+#include "leveldb/env.h"
+#include "port/port.h"
+#include "util/stats_logger.h"
+
+#include "boost/lexical_cast.hpp"
+
+using namespace Tleveldb;
+using Tleveldb::scribeClient;
+
+using namespace apache::thrift;
+using namespace apache::thrift::protocol;
+using namespace apache::thrift::transport;
+using boost::shared_ptr;
+
+
+using namespace  ::Tleveldb;
+
+namespace leveldb {
+
+class ScribeLogger : public StatsLogger{
+private:
+  std::string host_;
+  int port_;
+  int batch_size_;
+
+  scribeClient* scribe_client_;
+  std::vector<LogEntry> logs_;
+  port::Mutex logger_mutex_;
+
+  int retry_times_;
+  uint32_t  retry_intervals_;
+
+  void MakeScribeMessage(std::string& output, std::vector<std::string>& cols);
+
+public:
+
+  static const std::string COL_SEPERATOR;
+  static const std::string DEPLOY_STATS_CATEGORY;
+
+  ScribeLogger(const std::string& host, int port,
+      int retry_times=3, uint32_t retry_intervals=1000000,
+      int batch_size=1);
+  virtual ~ScribeLogger();
+
+  virtual void Log(const std::string& category, const std::string& message);
+
+  virtual void Log_Deploy_Stats(
+      const std::string& db_version,
+      const std::string& machine_info,
+      const std::string& data_dir,
+      const uint64_t data_size,
+      const uint32_t file_number,
+      const std::string& data_size_per_level,
+      const std::string& file_number_per_level,
+      const int64_t& ts_unix
+      );
+
+};
+}
+
+#endif /* SCRIBE_LOGGER_H_ */
--- a/util/env_posix.cc
+++ b/util/env_posix.cc
@ -537,6 +537,43 @@ class PosixEnv : public Env {
    usleep(micros);
  }

+  virtual Status GetHostName(char* name, uint len) {
+    int ret = gethostname(name, len);
+    if (ret < 0) {
+      if (errno == EFAULT || errno == EINVAL)
+        return Status::InvalidArgument(strerror(errno));
+      else
+        return IOError("GetHostName", errno);
+    }
+    return Status::OK();
+  }
+
+  virtual Status GetCurrentTime(int64_t* unix_time) {
+    time_t ret = time(NULL);
+    if (ret == (time_t) -1) {
+      return IOError("GetCurrentTime", errno);
+    }
+    *unix_time = (int64_t) ret;
+    return Status::OK();
+  }
+
+  virtual Status GetAbsolutePath(const std::string& db_path,
+      std::string* output_path) {
+    if (db_path.find('/') == 0) {
+      *output_path = db_path;
+      return Status::OK();
+    }
+
+    char the_path[256];
+    char* ret = getcwd(the_path, 256);
+    if (ret == NULL) {
+      return Status::IOError(strerror(errno));
+    }
+
+    *output_path = ret;
+    return Status::OK();
+  }
+
 private:
  void PthreadCall(const char* label, int result) {
    if (result != 0) {
--- a/util/options.cc
+++ b/util/options.cc
@ -35,7 +35,8 @@ Options::Options()
      max_grandparent_overlap_factor(10),
      filter_policy(NULL),
      statistics(NULL),
-      disableDataSync(false) {
+      disableDataSync(false),
+      db_stats_log_interval(1800) {
 }

 }  // namespace leveldb
--- a/util/stats_logger.h
+++ b/util/stats_logger.h
@ -0,0 +1,23 @@
+#ifndef STATS_LOGGER_H_
+#define STATS_LOGGER_H_
+
+namespace leveldb {
+
+class StatsLogger {
+
+ public:
+
+  virtual void Log_Deploy_Stats(const std::string& db_version,
+                                const std::string& machine_info,
+                                const std::string& data_dir,
+                                const uint64_t data_size,
+                                const uint32_t file_number,
+                                const std::string& data_size_per_level,
+                                const std::string& file_number_per_level,
+                                const int64_t& ts_unix) = 0;
+
+};
+
+}
+
+#endif