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rocksdb/db/error_handler.cc
mrambacher 12f1137355 Add a SystemClock class to capture the time functions of an Env (#7858) 
Summary:
Introduces and uses a SystemClock class to RocksDB.  This class contains the time-related functions of an Env and these functions can be redirected from the Env to the SystemClock.

Many of the places that used an Env (Timer, PerfStepTimer, RepeatableThread, RateLimiter, WriteController) for time-related functions have been changed to use SystemClock instead.  There are likely more places that can be changed, but this is a start to show what can/should be done.  Over time it would be nice to migrate most (if not all) of the uses of the time functions from the Env to the SystemClock.

There are several Env classes that implement these functions.  Most of these have not been converted yet to SystemClock implementations; that will come in a subsequent PR.  It would be good to unify many of the Mock Timer implementations, so that they behave similarly and be tested similarly (some override Sleep, some use a MockSleep, etc).

Additionally, this change will allow new methods to be introduced to the SystemClock (like https://github.com/facebook/rocksdb/issues/7101 WaitFor) in a consistent manner across a smaller number of classes.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/7858

Reviewed By: pdillinger

Differential Revision: D26006406

Pulled By: mrambacher

fbshipit-source-id: ed10a8abbdab7ff2e23d69d85bd25b3e7e899e90
2021-01-25 22:09:11 -08:00

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// Copyright (c) 2018-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).
//
#include "db/error_handler.h"
#include "db/db_impl/db_impl.h"
#include "db/event_helpers.h"
#include "file/sst_file_manager_impl.h"
namespace ROCKSDB_NAMESPACE {
// Maps to help decide the severity of an error based on the
// BackgroundErrorReason, Code, SubCode and whether db_options.paranoid_checks
// is set or not. There are 3 maps, going from most specific to least specific
// (i.e from all 4 fields in a tuple to only the BackgroundErrorReason and
// paranoid_checks). The less specific map serves as a catch all in case we miss
// a specific error code or subcode.
std::map<std::tuple<BackgroundErrorReason, Status::Code, Status::SubCode, bool>,
Status::Severity>
ErrorSeverityMap = {
// Errors during BG compaction
{std::make_tuple(BackgroundErrorReason::kCompaction,
Status::Code::kIOError, Status::SubCode::kNoSpace,
true),
Status::Severity::kSoftError},
{std::make_tuple(BackgroundErrorReason::kCompaction,
Status::Code::kIOError, Status::SubCode::kNoSpace,
false),
Status::Severity::kNoError},
{std::make_tuple(BackgroundErrorReason::kCompaction,
Status::Code::kIOError, Status::SubCode::kSpaceLimit,
true),
Status::Severity::kHardError},
{std::make_tuple(BackgroundErrorReason::kCompaction,
Status::Code::kIOError, Status::SubCode::kIOFenced,
true),
Status::Severity::kFatalError},
{std::make_tuple(BackgroundErrorReason::kCompaction,
Status::Code::kIOError, Status::SubCode::kIOFenced,
false),
Status::Severity::kFatalError},
// Errors during BG flush
{std::make_tuple(BackgroundErrorReason::kFlush, Status::Code::kIOError,
Status::SubCode::kNoSpace, true),
Status::Severity::kHardError},
{std::make_tuple(BackgroundErrorReason::kFlush, Status::Code::kIOError,
Status::SubCode::kNoSpace, false),
Status::Severity::kNoError},
{std::make_tuple(BackgroundErrorReason::kFlush, Status::Code::kIOError,
Status::SubCode::kSpaceLimit, true),
Status::Severity::kHardError},
{std::make_tuple(BackgroundErrorReason::kFlush, Status::Code::kIOError,
Status::SubCode::kIOFenced, true),
Status::Severity::kFatalError},
{std::make_tuple(BackgroundErrorReason::kFlush, Status::Code::kIOError,
Status::SubCode::kIOFenced, false),
Status::Severity::kFatalError},
// Errors during Write
{std::make_tuple(BackgroundErrorReason::kWriteCallback,
Status::Code::kIOError, Status::SubCode::kNoSpace,
true),
Status::Severity::kHardError},
{std::make_tuple(BackgroundErrorReason::kWriteCallback,
Status::Code::kIOError, Status::SubCode::kNoSpace,
false),
Status::Severity::kHardError},
{std::make_tuple(BackgroundErrorReason::kWriteCallback,
Status::Code::kIOError, Status::SubCode::kIOFenced,
true),
Status::Severity::kFatalError},
{std::make_tuple(BackgroundErrorReason::kWriteCallback,
Status::Code::kIOError, Status::SubCode::kIOFenced,
false),
Status::Severity::kFatalError},
// Errors during MANIFEST write
{std::make_tuple(BackgroundErrorReason::kManifestWrite,
Status::Code::kIOError, Status::SubCode::kNoSpace,
true),
Status::Severity::kHardError},
{std::make_tuple(BackgroundErrorReason::kManifestWrite,
Status::Code::kIOError, Status::SubCode::kNoSpace,
false),
Status::Severity::kHardError},
{std::make_tuple(BackgroundErrorReason::kManifestWrite,
Status::Code::kIOError, Status::SubCode::kIOFenced,
true),
Status::Severity::kFatalError},
{std::make_tuple(BackgroundErrorReason::kManifestWrite,
Status::Code::kIOError, Status::SubCode::kIOFenced,
false),
Status::Severity::kFatalError},
// Errors during BG flush with WAL disabled
{std::make_tuple(BackgroundErrorReason::kFlushNoWAL,
Status::Code::kIOError, Status::SubCode::kNoSpace,
true),
Status::Severity::kHardError},
{std::make_tuple(BackgroundErrorReason::kFlushNoWAL,
Status::Code::kIOError, Status::SubCode::kNoSpace,
false),
Status::Severity::kNoError},
{std::make_tuple(BackgroundErrorReason::kFlushNoWAL,
Status::Code::kIOError, Status::SubCode::kSpaceLimit,
true),
Status::Severity::kHardError},
{std::make_tuple(BackgroundErrorReason::kFlushNoWAL,
Status::Code::kIOError, Status::SubCode::kIOFenced,
true),
Status::Severity::kFatalError},
{std::make_tuple(BackgroundErrorReason::kFlushNoWAL,
Status::Code::kIOError, Status::SubCode::kIOFenced,
false),
Status::Severity::kFatalError},
// Errors during MANIFEST write when WAL is disabled
{std::make_tuple(BackgroundErrorReason::kManifestWriteNoWAL,
Status::Code::kIOError, Status::SubCode::kNoSpace,
true),
Status::Severity::kHardError},
{std::make_tuple(BackgroundErrorReason::kManifestWriteNoWAL,
Status::Code::kIOError, Status::SubCode::kNoSpace,
false),
Status::Severity::kHardError},
{std::make_tuple(BackgroundErrorReason::kManifestWriteNoWAL,
Status::Code::kIOError, Status::SubCode::kIOFenced,
true),
Status::Severity::kFatalError},
{std::make_tuple(BackgroundErrorReason::kManifestWriteNoWAL,
Status::Code::kIOError, Status::SubCode::kIOFenced,
false),
Status::Severity::kFatalError},
};
std::map<std::tuple<BackgroundErrorReason, Status::Code, bool>,
Status::Severity>
DefaultErrorSeverityMap = {
// Errors during BG compaction
{std::make_tuple(BackgroundErrorReason::kCompaction,
Status::Code::kCorruption, true),
Status::Severity::kUnrecoverableError},
{std::make_tuple(BackgroundErrorReason::kCompaction,
Status::Code::kCorruption, false),
Status::Severity::kNoError},
{std::make_tuple(BackgroundErrorReason::kCompaction,
Status::Code::kIOError, true),
Status::Severity::kFatalError},
{std::make_tuple(BackgroundErrorReason::kCompaction,
Status::Code::kIOError, false),
Status::Severity::kNoError},
// Errors during BG flush
{std::make_tuple(BackgroundErrorReason::kFlush,
Status::Code::kCorruption, true),
Status::Severity::kUnrecoverableError},
{std::make_tuple(BackgroundErrorReason::kFlush,
Status::Code::kCorruption, false),
Status::Severity::kNoError},
{std::make_tuple(BackgroundErrorReason::kFlush, Status::Code::kIOError,
true),
Status::Severity::kFatalError},
{std::make_tuple(BackgroundErrorReason::kFlush, Status::Code::kIOError,
false),
Status::Severity::kNoError},
// Errors during Write
{std::make_tuple(BackgroundErrorReason::kWriteCallback,
Status::Code::kCorruption, true),
Status::Severity::kUnrecoverableError},
{std::make_tuple(BackgroundErrorReason::kWriteCallback,
Status::Code::kCorruption, false),
Status::Severity::kNoError},
{std::make_tuple(BackgroundErrorReason::kWriteCallback,
Status::Code::kIOError, true),
Status::Severity::kFatalError},
{std::make_tuple(BackgroundErrorReason::kWriteCallback,
Status::Code::kIOError, false),
Status::Severity::kNoError},
{std::make_tuple(BackgroundErrorReason::kManifestWrite,
Status::Code::kIOError, true),
Status::Severity::kFatalError},
{std::make_tuple(BackgroundErrorReason::kManifestWrite,
Status::Code::kIOError, false),
Status::Severity::kFatalError},
// Errors during BG flush with WAL disabled
{std::make_tuple(BackgroundErrorReason::kFlushNoWAL,
Status::Code::kCorruption, true),
Status::Severity::kUnrecoverableError},
{std::make_tuple(BackgroundErrorReason::kFlushNoWAL,
Status::Code::kCorruption, false),
Status::Severity::kNoError},
{std::make_tuple(BackgroundErrorReason::kFlushNoWAL,
Status::Code::kIOError, true),
Status::Severity::kFatalError},
{std::make_tuple(BackgroundErrorReason::kFlushNoWAL,
Status::Code::kIOError, false),
Status::Severity::kNoError},
{std::make_tuple(BackgroundErrorReason::kManifestWriteNoWAL,
Status::Code::kIOError, true),
Status::Severity::kFatalError},
{std::make_tuple(BackgroundErrorReason::kManifestWriteNoWAL,
Status::Code::kIOError, false),
Status::Severity::kFatalError},
};
std::map<std::tuple<BackgroundErrorReason, bool>, Status::Severity>
DefaultReasonMap = {
// Errors during BG compaction
{std::make_tuple(BackgroundErrorReason::kCompaction, true),
Status::Severity::kFatalError},
{std::make_tuple(BackgroundErrorReason::kCompaction, false),
Status::Severity::kNoError},
// Errors during BG flush
{std::make_tuple(BackgroundErrorReason::kFlush, true),
Status::Severity::kFatalError},
{std::make_tuple(BackgroundErrorReason::kFlush, false),
Status::Severity::kNoError},
// Errors during Write
{std::make_tuple(BackgroundErrorReason::kWriteCallback, true),
Status::Severity::kFatalError},
{std::make_tuple(BackgroundErrorReason::kWriteCallback, false),
Status::Severity::kFatalError},
// Errors during Memtable update
{std::make_tuple(BackgroundErrorReason::kMemTable, true),
Status::Severity::kFatalError},
{std::make_tuple(BackgroundErrorReason::kMemTable, false),
Status::Severity::kFatalError},
};
void ErrorHandler::CancelErrorRecovery() {
#ifndef ROCKSDB_LITE
db_mutex_->AssertHeld();
// We'll release the lock before calling sfm, so make sure no new
// recovery gets scheduled at that point
auto_recovery_ = false;
SstFileManagerImpl* sfm = reinterpret_cast<SstFileManagerImpl*>(
db_options_.sst_file_manager.get());
if (sfm) {
// This may or may not cancel a pending recovery
db_mutex_->Unlock();
bool cancelled = sfm->CancelErrorRecovery(this);
db_mutex_->Lock();
if (cancelled) {
recovery_in_prog_ = false;
}
}
// If auto recovery is also runing to resume from the retryable error,
// we should wait and end the auto recovery.
EndAutoRecovery();
#endif
}
// This is the main function for looking at an error during a background
// operation and deciding the severity, and error recovery strategy. The high
// level algorithm is as follows -
// 1. Classify the severity of the error based on the ErrorSeverityMap,
// DefaultErrorSeverityMap and DefaultReasonMap defined earlier
// 2. Call a Status code specific override function to adjust the severity
// if needed. The reason for this is our ability to recover may depend on
// the exact options enabled in DBOptions
// 3. Determine if auto recovery is possible. A listener notification callback
// is called, which can disable the auto recovery even if we decide its
// feasible
// 4. For Status::NoSpace() errors, rely on SstFileManagerImpl to control
// the actual recovery. If no sst file manager is specified in DBOptions,
// a default one is allocated during DB::Open(), so there will always be
// one.
// This can also get called as part of a recovery operation. In that case, we
// also track the error separately in recovery_error_ so we can tell in the
// end whether recovery succeeded or not
const Status& ErrorHandler::SetBGError(const Status& bg_err,
BackgroundErrorReason reason) {
db_mutex_->AssertHeld();
if (bg_err.ok()) {
return bg_err;
}
bool paranoid = db_options_.paranoid_checks;
Status::Severity sev = Status::Severity::kFatalError;
Status new_bg_err;
DBRecoverContext context;
bool found = false;
{
auto entry = ErrorSeverityMap.find(std::make_tuple(reason, bg_err.code(),
bg_err.subcode(), paranoid));
if (entry != ErrorSeverityMap.end()) {
sev = entry->second;
found = true;
}
}
if (!found) {
auto entry = DefaultErrorSeverityMap.find(std::make_tuple(reason,
bg_err.code(), paranoid));
if (entry != DefaultErrorSeverityMap.end()) {
sev = entry->second;
found = true;
}
}
if (!found) {
auto entry = DefaultReasonMap.find(std::make_tuple(reason, paranoid));
if (entry != DefaultReasonMap.end()) {
sev = entry->second;
}
}
new_bg_err = Status(bg_err, sev);
// Check if recovery is currently in progress. If it is, we will save this
// error so we can check it at the end to see if recovery succeeded or not
if (recovery_in_prog_ && recovery_error_.ok()) {
recovery_error_ = new_bg_err;
}
bool auto_recovery = auto_recovery_;
if (new_bg_err.severity() >= Status::Severity::kFatalError && auto_recovery) {
auto_recovery = false;
}
// Allow some error specific overrides
if (new_bg_err == Status::NoSpace()) {
new_bg_err = OverrideNoSpaceError(new_bg_err, &auto_recovery);
}
if (!new_bg_err.ok()) {
Status s = new_bg_err;
EventHelpers::NotifyOnBackgroundError(db_options_.listeners, reason, &s,
db_mutex_, &auto_recovery);
if (!s.ok() && (s.severity() > bg_error_.severity())) {
bg_error_ = s;
} else {
// This error is less severe than previously encountered error. Don't
// take any further action
return bg_error_;
}
}
recover_context_ = context;
if (auto_recovery) {
recovery_in_prog_ = true;
// Kick-off error specific recovery
if (bg_error_ == Status::NoSpace()) {
RecoverFromNoSpace();
}
}
return bg_error_;
}
// This is the main function for looking at IO related error during the
// background operations. The main logic is:
// 1) File scope IO error is treated as retryable IO error in the write
// path. In RocksDB, If a file has write IO error and it is at file scope,
// RocksDB never write to the same file again. RocksDB will create a new
// file and rewrite the whole content. Thus, it is retryable.
// 1) if the error is caused by data loss, the error is mapped to
// unrecoverable error. Application/user must take action to handle
// this situation (File scope case is excluded).
// 2) if the error is a Retryable IO error (i.e., it is a file scope IO error,
// or its retryable flag is set and not a data loss error), auto resume
// will be called and the auto resume can be controlled by resume count
// and resume interval options. There are three sub-cases:
// a) if the error happens during compaction, it is mapped to a soft error.
// the compaction thread will reschedule a new compaction.
// b) if the error happens during flush and also WAL is empty, it is mapped
// to a soft error. Note that, it includes the case that IO error happens
// in SST or manifest write during flush.
// c) all other errors are mapped to hard error.
// 3) for other cases, SetBGError(const Status& bg_err, BackgroundErrorReason
// reason) will be called to handle other error cases.
const Status& ErrorHandler::SetBGError(const IOStatus& bg_io_err,
BackgroundErrorReason reason) {
db_mutex_->AssertHeld();
if (bg_io_err.ok()) {
return bg_io_err;
}
ROCKS_LOG_WARN(db_options_.info_log, "Background IO error %s",
bg_io_err.ToString().c_str());
if (recovery_in_prog_ && recovery_io_error_.ok()) {
recovery_io_error_ = bg_io_err;
}
if (BackgroundErrorReason::kManifestWrite == reason ||
BackgroundErrorReason::kManifestWriteNoWAL == reason) {
// Always returns ok
db_->DisableFileDeletionsWithLock().PermitUncheckedError();
}
Status new_bg_io_err = bg_io_err;
DBRecoverContext context;
if (bg_io_err.GetScope() != IOStatus::IOErrorScope::kIOErrorScopeFile &&
bg_io_err.GetDataLoss()) {
// First, data loss (non file scope) is treated as unrecoverable error. So
// it can directly overwrite any existing bg_error_.
bool auto_recovery = false;
Status bg_err(new_bg_io_err, Status::Severity::kUnrecoverableError);
bg_error_ = bg_err;
if (recovery_in_prog_ && recovery_error_.ok()) {
recovery_error_ = bg_err;
}
EventHelpers::NotifyOnBackgroundError(db_options_.listeners, reason,
&bg_err, db_mutex_, &auto_recovery);
recover_context_ = context;
return bg_error_;
} else if (bg_io_err.GetScope() ==
IOStatus::IOErrorScope::kIOErrorScopeFile ||
bg_io_err.GetRetryable()) {
// Second, check if the error is a retryable IO error (file scope IO error
// is also treated as retryable IO error in RocksDB write path). if it is
// retryable error and its severity is higher than bg_error_, overwrite the
// bg_error_ with new error. In current stage, for retryable IO error of
// compaction, treat it as soft error. In other cases, treat the retryable
// IO error as hard error.
bool auto_recovery = false;
EventHelpers::NotifyOnBackgroundError(db_options_.listeners, reason,
&new_bg_io_err, db_mutex_,
&auto_recovery);
if (BackgroundErrorReason::kCompaction == reason) {
Status bg_err(new_bg_io_err, Status::Severity::kSoftError);
if (bg_err.severity() > bg_error_.severity()) {
bg_error_ = bg_err;
}
recover_context_ = context;
return bg_error_;
} else if (BackgroundErrorReason::kFlushNoWAL == reason ||
BackgroundErrorReason::kManifestWriteNoWAL == reason) {
// When the BG Retryable IO error reason is flush without WAL,
// We map it to a soft error. At the same time, all the background work
// should be stopped except the BG work from recovery. Therefore, we
// set the soft_error_no_bg_work_ to true. At the same time, since DB
// continues to receive writes when BG error is soft error, to avoid
// to many small memtable being generated during auto resume, the flush
// reason is set to kErrorRecoveryRetryFlush.
Status bg_err(new_bg_io_err, Status::Severity::kSoftError);
if (recovery_in_prog_ && recovery_error_.ok()) {
recovery_error_ = bg_err;
}
if (bg_err.severity() > bg_error_.severity()) {
bg_error_ = bg_err;
}
soft_error_no_bg_work_ = true;
context.flush_reason = FlushReason::kErrorRecoveryRetryFlush;
recover_context_ = context;
return StartRecoverFromRetryableBGIOError(bg_io_err);
} else {
Status bg_err(new_bg_io_err, Status::Severity::kHardError);
if (recovery_in_prog_ && recovery_error_.ok()) {
recovery_error_ = bg_err;
}
if (bg_err.severity() > bg_error_.severity()) {
bg_error_ = bg_err;
}
recover_context_ = context;
return StartRecoverFromRetryableBGIOError(bg_io_err);
}
} else {
return SetBGError(new_bg_io_err, reason);
}
}
Status ErrorHandler::OverrideNoSpaceError(const Status& bg_error,
bool* auto_recovery) {
#ifndef ROCKSDB_LITE
if (bg_error.severity() >= Status::Severity::kFatalError) {
return bg_error;
}
if (db_options_.sst_file_manager.get() == nullptr) {
// We rely on SFM to poll for enough disk space and recover
*auto_recovery = false;
return bg_error;
}
if (db_options_.allow_2pc &&
(bg_error.severity() <= Status::Severity::kSoftError)) {
// Don't know how to recover, as the contents of the current WAL file may
// be inconsistent, and it may be needed for 2PC. If 2PC is not enabled,
// we can just flush the memtable and discard the log
*auto_recovery = false;
return Status(bg_error, Status::Severity::kFatalError);
}
{
uint64_t free_space;
if (db_options_.env->GetFreeSpace(db_options_.db_paths[0].path,
&free_space) == Status::NotSupported()) {
*auto_recovery = false;
}
}
return bg_error;
#else
(void)auto_recovery;
return Status(bg_error, Status::Severity::kFatalError);
#endif
}
void ErrorHandler::RecoverFromNoSpace() {
#ifndef ROCKSDB_LITE
SstFileManagerImpl* sfm =
reinterpret_cast<SstFileManagerImpl*>(db_options_.sst_file_manager.get());
// Inform SFM of the error, so it can kick-off the recovery
if (sfm) {
sfm->StartErrorRecovery(this, bg_error_);
}
#endif
}
Status ErrorHandler::ClearBGError() {
#ifndef ROCKSDB_LITE
db_mutex_->AssertHeld();
// Signal that recovery succeeded
if (recovery_error_.ok()) {
Status old_bg_error = bg_error_;
// Clear and check the recovery IO and BG error
bg_error_ = Status::OK();
recovery_io_error_ = IOStatus::OK();
bg_error_.PermitUncheckedError();
recovery_io_error_.PermitUncheckedError();
recovery_in_prog_ = false;
soft_error_no_bg_work_ = false;
EventHelpers::NotifyOnErrorRecoveryCompleted(db_options_.listeners,
old_bg_error, db_mutex_);
}
return recovery_error_;
#else
return bg_error_;
#endif
}
Status ErrorHandler::RecoverFromBGError(bool is_manual) {
#ifndef ROCKSDB_LITE
InstrumentedMutexLock l(db_mutex_);
bool no_bg_work_original_flag = soft_error_no_bg_work_;
if (is_manual) {
// If its a manual recovery and there's a background recovery in progress
// return busy status
if (recovery_in_prog_) {
return Status::Busy();
}
recovery_in_prog_ = true;
// In manual resume, we allow the bg work to run. If it is a auto resume,
// the bg work should follow this tag.
soft_error_no_bg_work_ = false;
// In manual resume, if the bg error is a soft error and also requires
// no bg work, the error must be recovered by call the flush with
// flush reason: kErrorRecoveryRetryFlush. In other case, the flush
// reason is set to kErrorRecovery.
if (no_bg_work_original_flag) {
recover_context_.flush_reason = FlushReason::kErrorRecoveryRetryFlush;
} else {
recover_context_.flush_reason = FlushReason::kErrorRecovery;
}
}
if (bg_error_.severity() == Status::Severity::kSoftError &&
recover_context_.flush_reason == FlushReason::kErrorRecovery) {
// Simply clear the background error and return
recovery_error_ = Status::OK();
return ClearBGError();
}
// Reset recovery_error_. We will use this to record any errors that happen
// during the recovery process. While recovering, the only operations that
// can generate background errors should be the flush operations
recovery_error_ = Status::OK();
recovery_error_.PermitUncheckedError();
Status s = db_->ResumeImpl(recover_context_);
if (s.ok()) {
soft_error_no_bg_work_ = false;
} else {
soft_error_no_bg_work_ = no_bg_work_original_flag;
}
// For manual recover, shutdown, and fatal error cases, set
// recovery_in_prog_ to false. For automatic background recovery, leave it
// as is regardless of success or failure as it will be retried
if (is_manual || s.IsShutdownInProgress() ||
bg_error_.severity() >= Status::Severity::kFatalError) {
recovery_in_prog_ = false;
}
return s;
#else
(void)is_manual;
return bg_error_;
#endif
}
const Status& ErrorHandler::StartRecoverFromRetryableBGIOError(
const IOStatus& io_error) {
#ifndef ROCKSDB_LITE
db_mutex_->AssertHeld();
if (bg_error_.ok()) {
return bg_error_;
} else if (io_error.ok()) {
return io_error;
} else if (db_options_.max_bgerror_resume_count <= 0 || recovery_in_prog_) {
// Auto resume BG error is not enabled, directly return bg_error_.
return bg_error_;
}
if (recovery_thread_) {
// In this case, if recovery_in_prog_ is false, current thread should
// wait the previous recover thread to finish and create a new thread
// to recover from the bg error.
db_mutex_->Unlock();
recovery_thread_->join();
db_mutex_->Lock();
}
recovery_in_prog_ = true;
recovery_thread_.reset(
new port::Thread(&ErrorHandler::RecoverFromRetryableBGIOError, this));
if (recovery_io_error_.ok() && recovery_error_.ok()) {
return recovery_error_;
} else {
TEST_SYNC_POINT("StartRecoverRetryableBGIOError:RecoverFail");
return bg_error_;
}
#else
(void)io_error;
return bg_error_;
#endif
}
// Automatic recover from Retryable BG IO error. Must be called after db
// mutex is released.
void ErrorHandler::RecoverFromRetryableBGIOError() {
#ifndef ROCKSDB_LITE
TEST_SYNC_POINT("RecoverFromRetryableBGIOError:BeforeStart");
TEST_SYNC_POINT("RecoverFromRetryableBGIOError:BeforeStart1");
InstrumentedMutexLock l(db_mutex_);
if (end_recovery_) {
return;
}
DBRecoverContext context = recover_context_;
int resume_count = db_options_.max_bgerror_resume_count;
uint64_t wait_interval = db_options_.bgerror_resume_retry_interval;
// Recover from the retryable error. Create a separate thread to do it.
while (resume_count > 0) {
if (end_recovery_) {
return;
}
TEST_SYNC_POINT("RecoverFromRetryableBGIOError:BeforeResume0");
TEST_SYNC_POINT("RecoverFromRetryableBGIOError:BeforeResume1");
recovery_io_error_ = IOStatus::OK();
recovery_error_ = Status::OK();
Status s = db_->ResumeImpl(context);
TEST_SYNC_POINT("RecoverFromRetryableBGIOError:AfterResume0");
TEST_SYNC_POINT("RecoverFromRetryableBGIOError:AfterResume1");
if (s.IsShutdownInProgress() ||
bg_error_.severity() >= Status::Severity::kFatalError) {
// If DB shutdown in progress or the error severity is higher than
// Hard Error, stop auto resume and returns.
TEST_SYNC_POINT("RecoverFromRetryableBGIOError:RecoverFail0");
recovery_in_prog_ = false;
return;
}
if (!recovery_io_error_.ok() &&
recovery_error_.severity() <= Status::Severity::kHardError &&
recovery_io_error_.GetRetryable()) {
// If new BG IO error happens during auto recovery and it is retryable
// and its severity is Hard Error or lower, the auto resmue sleep for
// a period of time and redo auto resume if it is allowed.
TEST_SYNC_POINT("RecoverFromRetryableBGIOError:BeforeWait0");
TEST_SYNC_POINT("RecoverFromRetryableBGIOError:BeforeWait1");
int64_t wait_until = db_->clock_->NowMicros() + wait_interval;
cv_.TimedWait(wait_until);
TEST_SYNC_POINT("RecoverFromRetryableBGIOError:AfterWait0");
} else {
// There are three possibility: 1) recover_io_error is set during resume
// and the error is not retryable, 2) recover is successful, 3) other
// error happens during resume and cannot be resumed here.
if (recovery_io_error_.ok() && recovery_error_.ok() && s.ok()) {
// recover from the retryable IO error and no other BG errors. Clean
// the bg_error and notify user.
TEST_SYNC_POINT("RecoverFromRetryableBGIOError:RecoverSuccess");
Status old_bg_error = bg_error_;
bg_error_ = Status::OK();
bg_error_.PermitUncheckedError();
EventHelpers::NotifyOnErrorRecoveryCompleted(db_options_.listeners,
old_bg_error, db_mutex_);
recovery_in_prog_ = false;
if (soft_error_no_bg_work_) {
soft_error_no_bg_work_ = false;
}
return;
} else {
TEST_SYNC_POINT("RecoverFromRetryableBGIOError:RecoverFail1");
// In this case: 1) recovery_io_error is more serious or not retryable
// 2) other Non IO recovery_error happens. The auto recovery stops.
recovery_in_prog_ = false;
return;
}
}
resume_count--;
}
recovery_in_prog_ = false;
TEST_SYNC_POINT("RecoverFromRetryableBGIOError:LoopOut");
return;
#else
return;
#endif
}
void ErrorHandler::EndAutoRecovery() {
db_mutex_->AssertHeld();
if (!end_recovery_) {
end_recovery_ = true;
}
cv_.SignalAll();
db_mutex_->Unlock();
if (recovery_thread_) {
recovery_thread_->join();
}
db_mutex_->Lock();
return;
}
} // namespace ROCKSDB_NAMESPACE
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