mirror of
https://github.com/mongodb/mongo.git
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291 lines
9.3 KiB
C++
291 lines
9.3 KiB
C++
// @file dur_journal.cpp
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/**
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* Copyright (C) 2010 10gen Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, version 3,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "pch.h"
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#if defined(_DURABLE)
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#include "client.h"
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#include "namespace.h"
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#include "dur_journal.h"
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#include "dur_journalformat.h"
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#include "../util/logfile.h"
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#include "../util/timer.h"
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#include "../util/alignedbuilder.h"
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#include <boost/static_assert.hpp>
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#undef assert
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#define assert MONGO_assert
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#include "../util/mongoutils/str.h"
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#include "../util/concurrency/mvar.h"
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namespace mongo {
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using namespace mongoutils;
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class AlignedBuilder;
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namespace dur {
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BOOST_STATIC_ASSERT( sizeof(JHeader) == 8192 );
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BOOST_STATIC_ASSERT( sizeof(JSectHeader) == 8 );
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BOOST_STATIC_ASSERT( sizeof(JSectFooter) == 20 );
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BOOST_STATIC_ASSERT( sizeof(JEntry) == 12 );
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filesystem::path getJournalDir() {
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filesystem::path p(dbpath);
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p /= "journal";
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return p;
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}
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/** this should be called when something really bad happens so that we can flag appropriately
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*/
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void journalingFailure(const char *msg) {
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/** todo:
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(1) don't log too much
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(2) make an indicator in the journal dir that something bad happened.
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(2b) refuse to do a recovery startup if that is there without manual override.
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*/
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log() << "journaling error " << msg << endl;
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assert(false);
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}
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JHeader::JHeader(string fname) {
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magic[0] = 'j'; magic[1] = '\n';
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version = 0x4141;
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memset(ts, 0, sizeof(ts));
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strncpy(ts, time_t_to_String_short(time(0)).c_str(), sizeof(ts)-1);
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memset(dbpath, 0, sizeof(dbpath));
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strncpy(dbpath, fname.c_str(), sizeof(dbpath)-1);
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memset(reserved3, 0, sizeof(reserved3));
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txt2[0] = txt2[1] = '\n';
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n1 = n2 = n3 = n4 = '\n';
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}
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struct Journal {
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static const unsigned long long DataLimit = 1 * 1024 * 1024 * 1024;
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public:
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string dir; // set by journalMakeDir() during initialization
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MVar<path> &toUnlink;
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Journal() :
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toUnlink(*(new MVar<path>)), /* freeing MVar at program termination would be problematic */
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_lfMutex("lfMutex")
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{
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_written = 0;
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_nextFileNumber = 0;
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_lf = 0;
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}
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void open();
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void rotate();
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void journal(const AlignedBuilder& b);
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path getFilePathFor(int filenumber) const;
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bool tryToCloseLogFile() {
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mutex::try_lock lk(_lfMutex, 2000);
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if( lk.ok ) {
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delete _lf;
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_lf = 0;
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}
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return lk.ok;
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}
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private:
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void _open();
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unsigned long long _written; // bytes written so far
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unsigned _nextFileNumber;
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LogFile *_lf;
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mutex _lfMutex; // lock when using _lf
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};
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static Journal j;
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path Journal::getFilePathFor(int filenumber) const {
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filesystem::path p(dir);
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p /= (str::stream() << "j._" << filenumber);
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return p;
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}
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/** throws */
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void removeJournalFiles() {
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try {
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for ( boost::filesystem::directory_iterator i( getJournalDir() );
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i != boost::filesystem::directory_iterator();
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++i ) {
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string fileName = boost::filesystem::path(*i).leaf();
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if( str::startsWith(fileName, "j._") ) {
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try {
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boost::filesystem::remove(*i);
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}
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catch(std::exception& e) {
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log() << "couldn't remove " << fileName << ' ' << e.what() << endl;
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}
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}
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}
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}
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catch( std::exception& e ) {
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log() << "error removing journal files " << e.what() << endl;
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throw;
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}
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}
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/** at clean shutdown */
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bool okToCleanUp = false; // failed recovery would set this to false
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void journalCleanup() {
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if( testIntent )
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return;
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if( !okToCleanUp )
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return;
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if( !j.tryToCloseLogFile() ) {
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return;
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}
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try {
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removeJournalFiles();
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}
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catch(std::exception& e) {
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log() << "error couldn't remove journal file during shutdown " << e.what() << endl;
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}
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}
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/** assure journal/ dir exists. throws */
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void journalMakeDir() {
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filesystem::path p = getJournalDir();
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j.dir = p.string();
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DEV log() << "dev journalMakeDir() " << j.dir << endl;
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if( !exists(j.dir) ) {
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try {
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create_directory(j.dir);
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}
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catch(std::exception& e) {
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log() << "error creating directory " << j.dir << ' ' << e.what() << endl;
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throw;
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}
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}
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}
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void Journal::_open() {
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assert( _lf == 0 );
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string fname = getFilePathFor(_nextFileNumber).string();
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_lf = new LogFile(fname);
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_nextFileNumber++;
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{
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JHeader h(fname);
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AlignedBuilder b(8192);
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b.appendStruct(h);
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_lf->synchronousAppend(b.buf(), b.len());
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}
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}
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void Journal::open() {
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mutex::scoped_lock lk(_lfMutex);
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_open();
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}
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void unlinkThread() {
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Client::initThread("unlink");
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while( 1 ) {
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path p = j.toUnlink.take();
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try {
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remove(p);
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}
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catch(std::exception& e) {
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log() << "error unlink of journal file " << p.string() << " failed " << e.what() << endl;
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}
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}
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}
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/** check if time to rotate files. assure a file is open.
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done separately from the journal() call as we can do this part
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outside of lock.
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thread: durThread()
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*/
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void journalRotate() {
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j.rotate();
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}
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void Journal::rotate() {
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if( _lf && _written < DataLimit )
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return;
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scoped_lock lk(_lfMutex);
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if( _lf && _written < DataLimit )
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return;
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if( _lf ) {
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delete _lf; // close
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_lf = 0;
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_written = 0;
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/* remove an older journal file. */
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if( _nextFileNumber >= 3 ) {
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unsigned fn = _nextFileNumber - 3;
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// we do unlinks asynchronously - unless they are falling behind.
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// (unlinking big files can be slow on some operating systems; we don't want to stop world)
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path p = j.getFilePathFor(fn);
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if( !j.toUnlink.tryPut(p) ) {
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/* DR___ for durability error and warning codes
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Compare to RS___ for replica sets
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*/
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log() << "DR100 latency warning on journal unlink" << endl;
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Timer t;
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j.toUnlink.put(p);
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log() << "toUnlink.put() " << t.millis() << "ms" << endl;
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}
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}
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}
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try {
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Timer t;
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_open();
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int ms = t.millis();
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if( ms >= 200 ) {
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log() << "DR101 latency warning on journal file open " << ms << "ms" << endl;
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}
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}
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catch(std::exception& e) {
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log() << "warning exception opening journal file " << e.what() << endl;
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}
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}
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/** write to journal
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thread: durThread()
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*/
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void journal(const AlignedBuilder& b) {
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j.journal(b);
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}
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void Journal::journal(const AlignedBuilder& b) {
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try {
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mutex::scoped_lock lk(_lfMutex);
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if( _lf == 0 )
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open();
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_written += b.len();
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_lf->synchronousAppend((void *) b.buf(), b.len());
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}
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catch(std::exception& e) {
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log() << "warning exception in dur::journal " << e.what() << endl;
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}
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}
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}
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}
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#endif
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/* todo
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test (and handle) disk full on journal append
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*/
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