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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
    </build-info>


<item>
            <title>[SERVER-12216] Database freezes during flushing mmaps, flushing takes over half minute</title>
                <link>https://jira.mongodb.org/browse/SERVER-12216</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Log says:&lt;br/&gt;
Mon Dec 30 17:12:08.065 &lt;span class=&quot;error&quot;&gt;&amp;#91;DataFileSync&amp;#93;&lt;/span&gt; flushing mmaps took 143988ms  for 30 files&lt;br/&gt;
(with syncdelay = 300, with default delay flushing takes 30-40 sec).&lt;/p&gt;</description>
                <environment>Windows Server 2008</environment>
        <key id="103972">SERVER-12216</key>
            <summary>Database freezes during flushing mmaps, flushing takes over half minute</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="ilyalyu">Ilya</reporter>
                        <labels>
                    </labels>
                <created>Mon, 30 Dec 2013 16:27:36 +0000</created>
                <updated>Wed, 10 Dec 2014 23:04:24 +0000</updated>
                            <resolved>Wed, 12 Mar 2014 04:04:37 +0000</resolved>
                                    <version>2.4.8</version>
                                                                        <votes>6</votes>
                                    <watches>19</watches>
                                                                                                                <comments>
                            <comment id="513965" author="dan@10gen.com" created="Wed, 12 Mar 2014 04:04:37 +0000"  >&lt;p&gt;Thanks for the update.&lt;/p&gt;</comment>
                            <comment id="513686" author="mdcallag" created="Tue, 11 Mar 2014 20:35:59 +0000"  >&lt;p&gt;That fixed the problem. The longest stall with 2.4.9 on my benchmark is almost 300 seconds and about 10 seconds with 2.6.0 rc0&lt;/p&gt;</comment>
                            <comment id="512713" author="dan@10gen.com" created="Mon, 10 Mar 2014 17:57:25 +0000"  >&lt;p&gt;In 2.5.5 we made a change that should alleviate the worst of the problem you&apos;re seeing.  See: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-7973&quot; title=&quot;Mongo should be able to reply to client requests for data in RAM while flushing to disk&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-7973&quot;&gt;&lt;del&gt;SERVER-7973&lt;/del&gt;&lt;/a&gt;, but in short, the MongoFilesLock is not held during the msync system call anymore.&lt;/p&gt;</comment>
                            <comment id="512559" author="mdcallag" created="Mon, 10 Mar 2014 15:56:23 +0000"  >&lt;p&gt;I suspect that dropping a database might also get stuck/delayed by msync even when there are no dirty pages for that database.&lt;/p&gt;

&lt;p&gt;From browsing the source I also think that Solaris and Windows builds use the exclusive lock more frequently and are more likely to get stalls.&lt;/p&gt;</comment>
                            <comment id="512039" author="mdcallag" created="Sat, 8 Mar 2014 19:08:44 +0000"  >&lt;p&gt;From browsing, LockedFilesExclusive is used by&lt;br/&gt;
1) MongoMMF::close - didn&apos;t take time to figure out how this is used&lt;br/&gt;
2) MongoFile::setFilename - called by MemoryMappedFile::map, maybe when files are opened.&lt;/p&gt;

&lt;p&gt;I wonder if #2 is also a a potential stall if that were called when a long-running sync were done.&lt;/p&gt;</comment>
                            <comment id="512037" author="mdcallag" created="Sat, 8 Mar 2014 18:57:16 +0000"  >&lt;p&gt;I reproduce minutes long stalls about once per hour using the insert benchmark &amp;#8211; &lt;a href=&quot;http://www.tokutek.com/resources/benchmark-results/tokumx-benchmark-hdd/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.tokutek.com/resources/benchmark-results/tokumx-benchmark-hdd/&lt;/a&gt;. My test server has a HW RAID card (fast fsync) and disk array that does between 1000 and 2000 random IOPs. I use the default syncdelay of 60 seconds and MongoDB 2.4.9.&lt;/p&gt;

&lt;p&gt;The problem is that updating internal mongod metadata after adding a new file is blocked until msync&apos;s on all files are finished. &lt;/p&gt;

&lt;p&gt;The mongod error log has this pattern around the time my java/mongo client gets an exception from the 60 second socketwait timeout:&lt;br/&gt;
1) flushing maps took 60+ seconds&lt;br/&gt;
2) followed immediately by &quot;allocating new datafile&quot;&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Sat Mar  8 10:00:57.466 [conn20] command iibench.$cmd command: { getlasterror: 1, fsync: true } ntoreturn:1 keyUpdates:0  reslen:79 259ms&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Sat Mar  8 10:00:57.772 [conn20] command iibench.$cmd command: { getlasterror: 1, fsync: true } ntoreturn:1 keyUpdates:0  reslen:79 211ms&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Sat Mar  8 10:01:57.897 [conn19] end connection 127.0.0.1:22258 (1 connection now open)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Sat Mar  8 10:01:59.007 [initandlisten] connection accepted from 127.0.0.1:48491 #21 (2 connections now open)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Sat Mar  8 10:02:02.800 [DataFileSync] flushing mmaps took 114360ms  for 26 files&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Sat Mar  8 10:02:03.719 [FileAllocator] allocating new datafile /data/mysql/m249/db/iibench.24, filling with zeroes...&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Sat Mar  8 10:02:03.720 [FileAllocator] done allocating datafile /data/mysql/m249/db/iibench.24, size: 2047MB,  took 0 secs&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Sat Mar  8 10:02:03.770 [conn20] insert iibench.purchases_index ninserted:1000 keyUpdates:0 locks(micros) w:65994240 65994ms&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Sat Mar  8 10:02:03.818 [conn20] end connection 127.0.0.1:22614 (1 connection now open)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Sat Mar  8 10:02:03.942 [initandlisten] connection accepted from 127.0.0.1:42227 #22 (2 connections now open)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Sat Mar  8 10:02:10.534 [conn22] insert iibench.purchases_index ninserted:1000 keyUpdates:0 locks(micros) w:102909 102ms&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Sat Mar  8 10:02:14.056 [conn22] command iibench.$cmd command: { getlasterror: 1, fsync: true } ntoreturn:1 keyUpdates:0  reslen:79 2923ms&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Stacktraces from the time of the long wait show the problem&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;nanosleep,mongo::sleepmicros,mongo::RWLockRecursiveNongreedy::Lock,Exclusive,LockMongoFilesExclusive,mongo::MongoFile::created,mongo::MemoryMappedFile::MemoryMappedFile,mongo::MongoMMF::MongoMMF,MongoDataFile,mongo::Database::getFile,mongo::Database::addAFile,mongo::Database::suitableFile,mongo::Database::allocExtent,mongo::outOfSpace,mongo::allocateSpaceForANewRecord,mongo::DataFileMgr::insert,mongo::DataFileMgr::insertWithObjMod,mongo::checkAndInsert,mongo::insertMulti,mongo::receivedInsert,mongo::assembleResponse,mongo::MyMessageHandler::process,mongo::PortMessageServer::handleIncomingMsg&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;msync,mongo::PosixFlushable::flush,mongo::MongoFile::_flushAll,mongo::MongoFile::flushAll,mongo::DataFileSync::run,mongo::BackgroundJob::jobBody,operator(),operator()&amp;lt;boost::_mfi::mf1&amp;lt;void,,operator(),boost::detail::thread_data&amp;lt;boost::_bi::bind_t&amp;lt;void,,boost::(anonymous&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;MongoFile::_flushAll appears to hold LockMongoFilesShared while doing the msync for all files.&lt;/p&gt;

&lt;p&gt;MongoFile::created gets LockMongoFilesExclusive to finish adding a new file. That will block until the msyncs are finished.&lt;/p&gt;

&lt;p&gt;I wonder whether other stalls lurk in the code form the use of LockMongoFiles&lt;/p&gt;
{Shared/Exclusive}</comment>
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