rocksdb/java/rocksjni/write_batch_test.cc

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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
//
// This file implements the "bridge" between Java and C++ and enables
// calling c++ rocksdb::WriteBatch methods testing from Java side.
#include <memory>
#include "db/memtable.h"
#include "db/write_batch_internal.h"
#include "include/org_rocksdb_WriteBatch.h"
#include "include/org_rocksdb_WriteBatchTest.h"
#include "include/org_rocksdb_WriteBatchTestInternalHelper.h"
#include "include/org_rocksdb_WriteBatch_Handler.h"
#include "options/cf_options.h"
#include "rocksdb/db.h"
#include "rocksdb/env.h"
#include "rocksdb/memtablerep.h"
#include "rocksdb/status.h"
#include "rocksdb/write_batch.h"
#include "rocksdb/write_buffer_manager.h"
#include "rocksjni/portal.h"
#include "table/scoped_arena_iterator.h"
#include "test_util/testharness.h"
#include "util/string_util.h"
/*
* Class: org_rocksdb_WriteBatchTest
* Method: getContents
* Signature: (J)[B
*/
jbyteArray Java_org_rocksdb_WriteBatchTest_getContents(JNIEnv* env,
jclass /*jclazz*/,
jlong jwb_handle) {
auto* b = reinterpret_cast<rocksdb::WriteBatch*>(jwb_handle);
assert(b != nullptr);
// todo: Currently the following code is directly copied from
// db/write_bench_test.cc. It could be implemented in java once
// all the necessary components can be accessed via jni api.
rocksdb::InternalKeyComparator cmp(rocksdb::BytewiseComparator());
auto factory = std::make_shared<rocksdb::SkipListFactory>();
rocksdb::Options options;
rocksdb::WriteBufferManager wb(options.db_write_buffer_size);
options.memtable_factory = factory;
rocksdb::MemTable* mem = new rocksdb::MemTable(
cmp, rocksdb::ImmutableCFOptions(options),
rocksdb::MutableCFOptions(options), &wb, rocksdb::kMaxSequenceNumber,
0 /* column_family_id */);
mem->Ref();
std::string state;
rocksdb::ColumnFamilyMemTablesDefault cf_mems_default(mem);
Refactor trimming logic for immutable memtables (#5022) Summary: MyRocks currently sets `max_write_buffer_number_to_maintain` in order to maintain enough history for transaction conflict checking. The effectiveness of this approach depends on the size of memtables. When memtables are small, it may not keep enough history; when memtables are large, this may consume too much memory. We are proposing a new way to configure memtable list history: by limiting the memory usage of immutable memtables. The new option is `max_write_buffer_size_to_maintain` and it will take precedence over the old `max_write_buffer_number_to_maintain` if they are both set to non-zero values. The new option accounts for the total memory usage of flushed immutable memtables and mutable memtable. When the total usage exceeds the limit, RocksDB may start dropping immutable memtables (which is also called trimming history), starting from the oldest one. The semantics of the old option actually works both as an upper bound and lower bound. History trimming will start if number of immutable memtables exceeds the limit, but it will never go below (limit-1) due to history trimming. In order the mimic the behavior with the new option, history trimming will stop if dropping the next immutable memtable causes the total memory usage go below the size limit. For example, assuming the size limit is set to 64MB, and there are 3 immutable memtables with sizes of 20, 30, 30. Although the total memory usage is 80MB > 64MB, dropping the oldest memtable will reduce the memory usage to 60MB < 64MB, so in this case no memtable will be dropped. Pull Request resolved: https://github.com/facebook/rocksdb/pull/5022 Differential Revision: D14394062 Pulled By: miasantreble fbshipit-source-id: 60457a509c6af89d0993f988c9b5c2aa9e45f5c5
2019-08-23 22:54:09 +02:00
rocksdb::Status s = rocksdb::WriteBatchInternal::InsertInto(
b, &cf_mems_default, nullptr, nullptr);
unsigned int count = 0;
rocksdb::Arena arena;
rocksdb::ScopedArenaIterator iter(
mem->NewIterator(rocksdb::ReadOptions(), &arena));
for (iter->SeekToFirst(); iter->Valid(); iter->Next()) {
rocksdb::ParsedInternalKey ikey;
ikey.clear();
bool parsed = rocksdb::ParseInternalKey(iter->key(), &ikey);
if (!parsed) {
assert(parsed);
}
switch (ikey.type) {
case rocksdb::kTypeValue:
state.append("Put(");
state.append(ikey.user_key.ToString());
state.append(", ");
state.append(iter->value().ToString());
state.append(")");
count++;
break;
case rocksdb::kTypeMerge:
state.append("Merge(");
state.append(ikey.user_key.ToString());
state.append(", ");
state.append(iter->value().ToString());
state.append(")");
count++;
break;
case rocksdb::kTypeDeletion:
state.append("Delete(");
state.append(ikey.user_key.ToString());
state.append(")");
count++;
break;
case rocksdb::kTypeSingleDeletion:
state.append("SingleDelete(");
state.append(ikey.user_key.ToString());
state.append(")");
count++;
break;
case rocksdb::kTypeRangeDeletion:
state.append("DeleteRange(");
state.append(ikey.user_key.ToString());
state.append(", ");
state.append(iter->value().ToString());
state.append(")");
count++;
break;
case rocksdb::kTypeLogData:
state.append("LogData(");
state.append(ikey.user_key.ToString());
state.append(")");
count++;
break;
default:
assert(false);
state.append("Err:Expected(");
state.append(std::to_string(ikey.type));
state.append(")");
count++;
break;
}
state.append("@");
state.append(rocksdb::NumberToString(ikey.sequence));
}
if (!s.ok()) {
state.append(s.ToString());
} else if (rocksdb::WriteBatchInternal::Count(b) != count) {
state.append("Err:CountMismatch(expected=");
state.append(std::to_string(rocksdb::WriteBatchInternal::Count(b)));
state.append(", actual=");
state.append(std::to_string(count));
state.append(")");
}
delete mem->Unref();
jbyteArray jstate = env->NewByteArray(static_cast<jsize>(state.size()));
if (jstate == nullptr) {
// exception thrown: OutOfMemoryError
return nullptr;
}
env->SetByteArrayRegion(
jstate, 0, static_cast<jsize>(state.size()),
const_cast<jbyte*>(reinterpret_cast<const jbyte*>(state.c_str())));
if (env->ExceptionCheck()) {
// exception thrown: ArrayIndexOutOfBoundsException
env->DeleteLocalRef(jstate);
return nullptr;
}
return jstate;
}
/*
* Class: org_rocksdb_WriteBatchTestInternalHelper
* Method: setSequence
* Signature: (JJ)V
*/
void Java_org_rocksdb_WriteBatchTestInternalHelper_setSequence(
JNIEnv* /*env*/, jclass /*jclazz*/, jlong jwb_handle, jlong jsn) {
auto* wb = reinterpret_cast<rocksdb::WriteBatch*>(jwb_handle);
assert(wb != nullptr);
rocksdb::WriteBatchInternal::SetSequence(
wb, static_cast<rocksdb::SequenceNumber>(jsn));
}
/*
* Class: org_rocksdb_WriteBatchTestInternalHelper
* Method: sequence
* Signature: (J)J
*/
jlong Java_org_rocksdb_WriteBatchTestInternalHelper_sequence(JNIEnv* /*env*/,
jclass /*jclazz*/,
jlong jwb_handle) {
auto* wb = reinterpret_cast<rocksdb::WriteBatch*>(jwb_handle);
assert(wb != nullptr);
return static_cast<jlong>(rocksdb::WriteBatchInternal::Sequence(wb));
}
/*
* Class: org_rocksdb_WriteBatchTestInternalHelper
* Method: append
* Signature: (JJ)V
*/
void Java_org_rocksdb_WriteBatchTestInternalHelper_append(JNIEnv* /*env*/,
jclass /*jclazz*/,
jlong jwb_handle_1,
jlong jwb_handle_2) {
auto* wb1 = reinterpret_cast<rocksdb::WriteBatch*>(jwb_handle_1);
assert(wb1 != nullptr);
auto* wb2 = reinterpret_cast<rocksdb::WriteBatch*>(jwb_handle_2);
assert(wb2 != nullptr);
rocksdb::WriteBatchInternal::Append(wb1, wb2);
}