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Rewrote how injected faults are handled in SQLite to be more reliable and work with an upcoming write throttling feature in AsyncFileCached.

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This commit is contained in:
Steve Atherton 2021-01-15 19:29:14 -08:00
parent 9bca167cc2
commit 6da78b1b19
6 changed files with 154 additions and 38 deletions
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1
fdbserver/CMakeLists.txt
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@ -96,6 +96,7 @@ set(FDBSERVER_SRCS
TLogInterface.h
TLogServer.actor.cpp
VersionedBTree.actor.cpp
VFSAsync.h
VFSAsync.cpp
WaitFailure.actor.cpp
WaitFailure.h

21
fdbserver/KeyValueStoreSQLite.actor.cpp
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@ -32,6 +32,7 @@ extern "C" {
u32 sqlite3VdbeSerialGet(const unsigned char*, u32, Mem*);
}
#include "flow/ThreadPrimitives.h"
#include "fdbserver/VFSAsync.h"
#include "fdbserver/template_fdb.h"
#include "fdbrpc/simulator.h"
#include "flow/actorcompiler.h" // This must be the last #include.
@ -222,6 +223,7 @@ struct SQLiteDB : NonCopyable {
bool page_checksums;
bool fragment_values;
PageChecksumCodec *pPagerCodec; // we do NOT own this pointer, db does.
VFSAsyncFile *vfsDB, *vfsWAL;
void beginTransaction(bool write) {
checkError("BtreeBeginTrans", sqlite3BtreeBeginTrans(btree, write));
@ -236,7 +238,7 @@ struct SQLiteDB : NonCopyable {
void open(bool writable);
void createFromScratch();
SQLiteDB( std::string filename, bool page_checksums, bool fragment_values): filename(filename), db(NULL), btree(NULL), table(-1), freetable(-1), haveMutex(false), page_checksums(page_checksums), fragment_values(fragment_values) {}
SQLiteDB( std::string filename, bool page_checksums, bool fragment_values): filename(filename), db(NULL), btree(NULL), table(-1), freetable(-1), haveMutex(false), page_checksums(page_checksums), fragment_values(fragment_values), vfsDB(nullptr), vfsWAL(nullptr) {}
~SQLiteDB() {
if (db) {
@ -260,14 +262,24 @@ struct SQLiteDB : NonCopyable {
}
}
bool consumeInjectedErrors() {
// Both of these consumeInjectedError() calls must be made, If this was written as one expression
// then if the first one returned true the second call would be skipped.
bool dbErr = (vfsDB != nullptr && vfsDB->consumeInjectedError());
bool walErr = (vfsWAL != nullptr && vfsWAL->consumeInjectedError());
return dbErr || walErr;
}
void checkError( const char* context, int rc ) {
//if (deterministicRandom()->random01() < .001) rc = SQLITE_INTERRUPT;
if (rc) {
// Our exceptions don't propagate through sqlite, so we don't know for sure if the error that caused this was
// an injected fault. Assume that if fault injection is happening, this is an injected fault.
Error err = io_error();
if (g_network->isSimulated() && (g_simulator.getCurrentProcess()->fault_injection_p1 || g_simulator.getCurrentProcess()->machine->machineProcess->fault_injection_p1 || g_simulator.getCurrentProcess()->rebooting))
if (g_network->isSimulated() && (consumeInjectedErrors())) {
err = err.asInjectedFault();
}
if (db)
db->errCode = rc;
@ -1378,6 +1390,11 @@ void SQLiteDB::open(bool writable) {
int result = sqlite3_open_v2(apath.c_str(), &db, (writable ? SQLITE_OPEN_READWRITE : SQLITE_OPEN_READONLY), NULL);
checkError("open", result);
vfsDB = (VFSAsyncFile *)sqlite3_get_vfs_db(db);
ASSERT(vfsDB != nullptr);
vfsWAL = (VFSAsyncFile *)sqlite3_get_vfs_wal(db);
ASSERT(vfsWAL != nullptr);
int chunkSize;
if( !g_network->isSimulated() ) {
chunkSize = 4096 * SERVER_KNOBS->SQLITE_CHUNK_SIZE_PAGES;

81
fdbserver/VFSAsync.cpp
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@ -46,6 +46,8 @@
#include <fcntl.h>
#endif
#include "fdbserver/VFSAsync.h"
/*
** The maximum pathname length supported by this VFS.
*/
@ -58,35 +60,11 @@
#define EXCLUSIVE_LOCK 4
const uint32_t RESERVED_COUNT = 1U<<29;
/*
** When using this VFS, the sqlite3_file* handles that SQLite uses are
** actually pointers to instances of type VFSAsyncFile.
*/
typedef struct VFSAsyncFile VFSAsyncFile;
struct VFSAsyncFile {
sqlite3_file base; /* Base class. Must be first. */
int flags;
std::string filename;
Reference<IAsyncFile> file;
VFSAsyncFile::VFSAsyncFile(std::string const& filename, int flags)
: filename(filename), flags(flags), pLockCount(&filename_lockCount_openCount[filename].first), debug_zcrefs(0), debug_zcreads(0), debug_reads(0), chunkSize(0), errorInjected(false) {
filename_lockCount_openCount[filename].second++;
}
uint32_t * const pLockCount; // +1 for each SHARED_LOCK, or 1+X_COUNT for lock level X
int lockLevel; // NO_LOCK, SHARED_LOCK, RESERVED_LOCK, PENDING_LOCK, or EXCLUSIVE_LOCK
struct SharedMemoryInfo *sharedMemory;
int sharedMemorySharedLocks;
int sharedMemoryExclusiveLocks;
int debug_zcrefs, debug_zcreads, debug_reads;
int chunkSize;
VFSAsyncFile(std::string const& filename, int flags) : filename(filename), flags(flags), pLockCount(&filename_lockCount_openCount[filename].first), debug_zcrefs(0), debug_zcreads(0), debug_reads(0), chunkSize(0) {
filename_lockCount_openCount[filename].second++;
}
~VFSAsyncFile();
static std::map<std::string, std::pair<uint32_t,int>> filename_lockCount_openCount;
};
std::map<std::string, std::pair<uint32_t,int>> VFSAsyncFile::filename_lockCount_openCount;
static int asyncClose(sqlite3_file *pFile){
@ -112,7 +90,10 @@ static int asyncRead(sqlite3_file *pFile, void *zBuf, int iAmt, sqlite_int64 iOf
return SQLITE_IOERR_SHORT_READ;
}
return SQLITE_OK;
} catch (Error& ) {
} catch (Error &e) {
if(e.isInjectedFault()) {
((VFSAsyncFile *)pFile)->errorInjected = true;
}
return SQLITE_IOERR_READ;
}
}
@ -123,7 +104,10 @@ static int asyncReleaseZeroCopy(sqlite3_file* pFile, void* data, int iAmt, sqlit
try{
--p->debug_zcrefs;
p->file->releaseZeroCopy( data, iAmt, iOfst );
} catch (Error& ) {
} catch (Error &e) {
if(e.isInjectedFault()) {
((VFSAsyncFile *)pFile)->errorInjected = true;
}
return SQLITE_IOERR;
}
return SQLITE_OK;
@ -145,7 +129,10 @@ static int asyncReadZeroCopy(sqlite3_file *pFile, void **data, int iAmt, sqlite_
}
++p->debug_zcreads;
return SQLITE_OK;
} catch (Error& ) {
} catch (Error &e) {
if(e.isInjectedFault()) {
((VFSAsyncFile *)pFile)->errorInjected = true;
}
return SQLITE_IOERR_READ;
}
}
@ -162,7 +149,10 @@ static int asyncReadZeroCopy(sqlite3_file *pFile, void **data, int iAmt, sqlite_
return SQLITE_IOERR_SHORT_READ;
}
return SQLITE_OK;
} catch (Error& ) {
} catch (Error &e) {
if(e.isInjectedFault()) {
((VFSAsyncFile *)pFile)->errorInjected = true;
}
return SQLITE_IOERR_READ;
}
}
@ -178,7 +168,10 @@ static int asyncWrite(sqlite3_file *pFile, const void *zBuf, int iAmt, sqlite_in
try {
waitFor( p->file->write( zBuf, iAmt, iOfst ) );
return SQLITE_OK;
} catch(Error& ) {
} catch(Error &e) {
if(e.isInjectedFault()) {
((VFSAsyncFile *)pFile)->errorInjected = true;
}
return SQLITE_IOERR_WRITE;
}
}
@ -194,7 +187,10 @@ static int asyncTruncate(sqlite3_file *pFile, sqlite_int64 size){
try {
waitFor( p->file->truncate( size ) );
return SQLITE_OK;
} catch(Error& ) {
} catch(Error &e) {
if(e.isInjectedFault()) {
((VFSAsyncFile *)pFile)->errorInjected = true;
}
return SQLITE_IOERR_TRUNCATE;
}
}
@ -204,7 +200,11 @@ static int asyncSync(sqlite3_file *pFile, int flags){
try {
waitFor( p->file->sync() );
return SQLITE_OK;
} catch (Error& e) {
} catch (Error &e) {
if(e.isInjectedFault()) {
((VFSAsyncFile *)pFile)->errorInjected = true;
}
TraceEvent("VFSSyncError")
.error(e)
.detail("Filename", p->filename)
@ -223,7 +223,10 @@ static int VFSAsyncFileSize(sqlite3_file *pFile, sqlite_int64 *pSize){
try {
*pSize = waitForAndGet( p->file->size() );
return SQLITE_OK;
} catch (Error& ) {
} catch (Error &e) {
if(e.isInjectedFault()) {
((VFSAsyncFile *)pFile)->errorInjected = true;
}
return SQLITE_IOERR_FSTAT;
}
}
@ -648,6 +651,9 @@ static int asyncFullPathname(
memcpy(zPathOut, s.c_str(), s.size()+1);
return SQLITE_OK;
} catch (Error& e) {
if(e.isInjectedFault()) {
((VFSAsyncFile *)pVfs)->errorInjected = true;
}
TraceEvent(SevError,"VFSAsyncFullPathnameError").error(e).detail("PathIn", (std::string)zPath);
return SQLITE_IOERR;
} catch(...) {
@ -716,6 +722,9 @@ static int asyncSleep(sqlite3_vfs *pVfs, int microseconds){
waitFor( g_network->delay( microseconds*1e-6, TaskPriority::DefaultDelay ) || simCancel );
return microseconds;
} catch( Error &e ) {
if(e.isInjectedFault()) {
((VFSAsyncFile *)pVfs)->errorInjected = true;
}
TraceEvent(SevError, "AsyncSleepError").error(e,true);
return 0;
}

78
fdbserver/VFSAsync.h Normal file
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@ -0,0 +1,78 @@
/*
* VFSAsync.h
*
* This source file is part of the FoundationDB open source project
*
* Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
*
* 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.
*/
#include "sqlite/sqlite3.h"
#include <string>
#include <map>
#include "fdbrpc/IAsyncFile.h"
#include "fdbserver/CoroFlow.h"
//#include <assert.h>
//#include <string.h>
//#ifdef WIN32
//#include <Windows.h>
//#endif
#ifdef __unixish__
//#include <sys/types.h>
//#include <sys/stat.h>
//#include <sys/file.h>
//#include <sys/param.h>
//#include <sys/time.h>
//#include <unistd.h>
//#include <errno.h>
//#include <fcntl.h>
#endif
/*
** When using this VFS, the sqlite3_file* handles that SQLite uses are
** actually pointers to instances of type VFSAsyncFile.
*/
typedef struct VFSAsyncFile VFSAsyncFile;
struct VFSAsyncFile {
sqlite3_file base; /* Base class. Must be first. */
int flags;
std::string filename;
Reference<IAsyncFile> file;
bool errorInjected;
bool consumeInjectedError() {
bool e = errorInjected;
errorInjected = false;
return e;
}
uint32_t * const pLockCount; // +1 for each SHARED_LOCK, or 1+X_COUNT for lock level X
int lockLevel; // NO_LOCK, SHARED_LOCK, RESERVED_LOCK, PENDING_LOCK, or EXCLUSIVE_LOCK
struct SharedMemoryInfo *sharedMemory;
int sharedMemorySharedLocks;
int sharedMemoryExclusiveLocks;
int debug_zcrefs, debug_zcreads, debug_reads;
int chunkSize;
VFSAsyncFile(std::string const& filename, int flags);
~VFSAsyncFile();
static std::map<std::string, std::pair<uint32_t,int>> filename_lockCount_openCount;
};

8
fdbserver/sqlite/sqlite3.amalgamation.c
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@ -93791,6 +93791,14 @@ SQLITE_API int sqlite3_open_v2(
return openDatabase(filename, ppDb, flags, zVfs);
}
SQLITE_API void * sqlite3_get_vfs_db(sqlite3 *pDb) {
return pDb->aDb[0].pBt->pBt->pPager->pWal->pDbFd;
}
SQLITE_API void * sqlite3_get_vfs_wal(sqlite3 *pDb) {
return pDb->aDb[0].pBt->pBt->pPager->pWal->pWalFd;
}
#ifndef SQLITE_OMIT_UTF16
/*
** Open a new database handle.

3
fdbserver/sqlite/sqlite3.h
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@ -2411,6 +2411,9 @@ SQLITE_API int sqlite3_open_v2(
const char *zVfs /* Name of VFS module to use */
);
SQLITE_API void * sqlite3_get_vfs_db(sqlite3 *pDb);
SQLITE_API void * sqlite3_get_vfs_wal(sqlite3 *pDb);
/*
** CAPI3REF: Error Codes And Messages
**