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/* @file dur_commitjob.cpp */
/**
* Copyright (C) 2009 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "pch.h"
#include "dur_commitjob.h"
#include "dur_stats.h"
#include "taskqueue.h"
#include "client.h"
#include "../util/concurrency/threadlocal.h"
namespace mongo {
#if defined(_DEBUG) && (defined(_WIN64) || !defined(_WIN32))
#define CHECK_SPOOLING 1
#endif
namespace dur {
extern unsigned notesThisLock;
void ThreadLocalIntents::push(const WriteIntent& x) {
if( !commitJob._hasWritten )
commitJob._hasWritten = true;
if( n == 21 )
unspool();
i[n++] = x;
#if( CHECK_SPOOLING )
nSpooled++;
#endif
}
void ThreadLocalIntents::_unspool() {
if( n ) {
DEV notesThisLock += n;
for( int j = 0; j < n; j++ )
commitJob.note(i[j].start(), i[j].length());
#if( CHECK_SPOOLING )
nSpooled.signedAdd(-n);
#endif
n = 0;
dassert( cmdLine.dur );
}
}
void ThreadLocalIntents::unspool() {
if( n ) {
SimpleMutex::scoped_lock lk(commitJob.groupCommitMutex);
_unspool();
}
}
AtomicUInt ThreadLocalIntents::nSpooled;
}
TSP_DECLARE(dur::ThreadLocalIntents,tlIntents)
TSP_DEFINE(dur::ThreadLocalIntents,tlIntents)
namespace dur {
void assertNothingSpooled() {
#if( CHECK_SPOOLING )
if( ThreadLocalIntents::nSpooled != 0 ) {
log() << ThreadLocalIntents::nSpooled.get() << endl;
if( tlIntents.get() )
log() << "me:" << tlIntents.get()->n_informational() << endl;
else
log() << "no tlIntent for my thread" << endl;
assert(false);
}
#endif
}
// when we release our w or W lock this is invoked
void unspoolWriteIntents() {
ThreadLocalIntents *t = tlIntents.get();
if( t )
t->unspool();
}
/** base declare write intent function that all the helpers call. */
/** we batch up our write intents so that we do not have to synchronize too often */
void DurableImpl::declareWriteIntent(void *p, unsigned len) {
cc().writeHappened();
MemoryMappedFile::makeWritable(p, len);
ThreadLocalIntents *t = tlIntents.getMake();
t->push(WriteIntent(p,len));
}
BOOST_STATIC_ASSERT( UncommittedBytesLimit > BSONObjMaxInternalSize * 3 );
BOOST_STATIC_ASSERT( sizeof(void*)==4 || UncommittedBytesLimit > BSONObjMaxInternalSize * 6 );
void WriteIntent::absorb(const WriteIntent& other) {
dassert(overlaps(other));
void* newStart = min(start(), other.start());
p = max(p, other.p);
len = (char*)p - (char*)newStart;
dassert(contains(other));
}
void IntentsAndDurOps::clear() {
assertLockedForCommitting();
commitJob.groupCommitMutex.dassertLocked();
_alreadyNoted.clear();
_intents.clear();
_durOps.clear();
#if defined(DEBUG_WRITE_INTENT)
cout << "_debug clear\n";
_debug.clear();
#endif
}
#if defined(DEBUG_WRITE_INTENT)
void assertAlreadyDeclared(void *p, int len) {
if( commitJob.wi()._debug[p] >= len )
return;
log() << "assertAlreadyDeclared fails " << (void*)p << " len:" << len << ' ' << commitJob.wi()._debug[p] << endl;
printStackTrace();
abort();
}
#endif
/** note an operation other than a "basic write" */
void CommitJob::noteOp(shared_ptr<DurOp> p) {
dassert( cmdLine.dur );
// DurOp's are rare so it is ok to have the lock cost here
SimpleMutex::scoped_lock lk(groupCommitMutex);
cc().writeHappened();
_hasWritten = true;
_intentsAndDurOps._durOps.push_back(p);
}
size_t privateMapBytes = 0; // used by _REMAPPRIVATEVIEW to track how much / how fast to remap
void CommitJob::commitingBegin() {
assertLockedForCommitting();
_commitNumber = _notify.now();
stats.curr->_commits++;
}
void CommitJob::_committingReset() {
_hasWritten = false;
_intentsAndDurOps.clear();
privateMapBytes += _bytes;
_bytes = 0;
_nSinceCommitIfNeededCall = 0;
}
CommitJob::CommitJob() :
groupCommitMutex("groupCommit"),
_hasWritten(false)
{
_commitNumber = 0;
_bytes = 0;
_nSinceCommitIfNeededCall = 0;
}
void CommitJob::note(void* p, int len) {
groupCommitMutex.dassertLocked();
dassert( _hasWritten );
// from the point of view of the dur module, it would be fine (i think) to only
// be read locked here. but must be at least read locked to avoid race with
// remapprivateview
if( !_intentsAndDurOps._alreadyNoted.checkAndSet(p, len) ) {
/** tips for debugging:
if you have an incorrect diff between data files in different folders
(see jstests/dur/quick.js for example),
turn this on and see what is logged. if you have a copy of its output from before the
regression, a simple diff of these lines would tell you a lot likely.
*/
#if 0 && defined(_DEBUG)
{
static int n;
if( ++n < 10000 ) {
size_t ofs;
MongoMMF *mmf = privateViews._find(w.p, ofs);
if( mmf ) {
log() << "DEBUG note write intent " << w.p << ' ' << mmf->filename() << " ofs:" << hex << ofs << " len:" << w.len << endl;
}
else {
log() << "DEBUG note write intent " << w.p << ' ' << w.len << " NOT FOUND IN privateViews" << endl;
}
}
else if( n == 10000 ) {
log() << "DEBUG stopping write intent logging, too much to log" << endl;
}
}
#endif
// remember intent. we will journal it in a bit
_intentsAndDurOps.insertWriteIntent(p, len);
{
// a bit over conservative in counting pagebytes used
static size_t lastPos; // note this doesn't reset with each commit, but that is ok we aren't being that precise
size_t x = ((size_t) p) & ~0xfff; // round off to page address (4KB)
if( x != lastPos ) {
lastPos = x;
unsigned b = (len+4095) & ~0xfff;
_bytes += b;
#if defined(_DEBUG)
_nSinceCommitIfNeededCall++;
if( _nSinceCommitIfNeededCall >= 80 ) {
if( _nSinceCommitIfNeededCall % 40 == 0 ) {
log() << "debug nsincecommitifneeded:" << _nSinceCommitIfNeededCall << " bytes:" << _bytes << endl;
if( _nSinceCommitIfNeededCall == 240 || _nSinceCommitIfNeededCall == 1200 ) {
log() << "_DEBUG printing stack given high nsinccommitifneeded number" << endl;
printStackTrace();
}
}
}
#endif
if (_bytes > UncommittedBytesLimit * 3) {
static time_t lastComplain;
static unsigned nComplains;
// throttle logging
if( ++nComplains < 100 || time(0) - lastComplain >= 60 ) {
lastComplain = time(0);
warning() << "DR102 too much data written uncommitted " << _bytes/1000000.0 << "MB" << endl;
if( nComplains < 10 || nComplains % 10 == 0 ) {
// wassert makes getLastError show an error, so we just print stack trace
printStackTrace();
}
}
}
}
}
}
}
}
}
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