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dur_commitjob.cpp
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dur_commitjob.cpp
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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 "taskqueue.h"
namespace mongo {
namespace dur {
BOOST_STATIC_ASSERT( UncommittedBytesLimit > BSONObjMaxInternalSize * 3 );
BOOST_STATIC_ASSERT( sizeof(void*)==4 || UncommittedBytesLimit > BSONObjMaxInternalSize * 6 );
void Writes::D::go(const Writes::D& d) {
commitJob.wi()._insertWriteIntent(d.p, d.len);
}
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 Writes::clear() {
dbMutex.assertAtLeastReadLocked();
_alreadyNoted.clear();
_writes.clear();
_ops.clear();
_drained = false;
#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
void Writes::_insertWriteIntent(void* p, int len) {
WriteIntent wi(p, len);
if (_writes.empty()) {
_writes.insert(wi);
return;
}
typedef set<WriteIntent>::const_iterator iterator; // shorter
iterator closest = _writes.lower_bound(wi);
// closest.end() >= wi.end()
if ((closest != _writes.end() && closest->overlaps(wi)) || // high end
(closest != _writes.begin() && (--closest)->overlaps(wi))) { // low end
if (closest->contains(wi))
return; // nothing to do
// find overlapping range and merge into wi
iterator end(closest);
iterator begin(closest);
while ( end->overlaps(wi)) { wi.absorb(*end); ++end; if (end == _writes.end()) break; } // look forwards
while (begin->overlaps(wi)) { wi.absorb(*begin); if (begin == _writes.begin()) break; --begin; } // look backwards
if (!begin->overlaps(wi)) ++begin; // make inclusive
DEV { // ensure we're not deleting anything we shouldn't
for (iterator it(begin); it != end; ++it) {
assert(wi.contains(*it));
}
}
_writes.erase(begin, end);
_writes.insert(wi);
DEV { // ensure there are no overlaps
// this can be very slow - n^2 - so make it RARELY
RARELY {
for (iterator it(_writes.begin()), end(boost::prior(_writes.end())); it != end; ++it) {
assert(!it->overlaps(*boost::next(it)));
}
}
}
}
else { // no entries overlapping wi
_writes.insert(closest, wi);
}
}
/** note an operation other than a "basic write" */
void CommitJob::noteOp(shared_ptr<DurOp> p) {
DEV dbMutex.assertWriteLocked();
dassert( cmdLine.dur );
if( !_hasWritten ) {
assert( !dbMutex._remapPrivateViewRequested );
_hasWritten = true;
}
_wi._ops.push_back(p);
}
size_t privateMapBytes = 0; // used by _REMAPPRIVATEVIEW to track how much / how fast to remap
void CommitJob::reset() {
_hasWritten = false;
_wi.clear();
_ab.reset();
privateMapBytes += _bytes;
_bytes = 0;
_nSinceCommitIfNeededCall = 0;
}
CommitJob::CommitJob() : _ab(4 * 1024 * 1024) , _hasWritten(false),
_bytes(0), _nSinceCommitIfNeededCall(0) { }
void CommitJob::note(void* p, int len) {
// 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
DEV dbMutex.assertWriteLocked();
dassert( cmdLine.dur );
if( !_wi._alreadyNoted.checkAndSet(p, len) ) {
MemoryMappedFile::makeWritable(p, len);
if( !_hasWritten ) {
// you can't be writing if one of these is pending, so this is a verification.
assert( !dbMutex._remapPrivateViewRequested );
// we don't bother doing a group commit when nothing is written, so we have a var to track that
_hasWritten = true;
}
/** 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
_wi.insertWriteIntent(p, len);
wassert( _wi._writes.size() < 2000000 );
assert( _wi._writes.size() < 20000000 );
{
// 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;
}
#endif
uassert(13623, "DR102 too much data written uncommitted", _bytes < UncommittedBytesLimit * 3);
}
}
}
}
}
}