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<channel>
    <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-13681] MongoDB stalls during background flush on Windows</title>
                <link>https://jira.mongodb.org/browse/SERVER-13681</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;div class=&quot;panel&quot; style=&quot;background-color: #EEEEEE;border-color: #ccc;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;border-bottom-color: #ccc;background-color: #6CB33F;&quot;&gt;&lt;b&gt;Issue Status as of Aug 4, 2014&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #EEEEEE;&quot;&gt;
&lt;p&gt;&lt;b&gt;ISSUE SUMMARY&lt;/b&gt;&lt;br/&gt;
For MongoDB instances running on Windows, MongoDB takes a global mutex that blocks all requests during the background flush of database files to disk.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;USER IMPACT&lt;/b&gt;&lt;br/&gt;
Database reads, and writes block during background flushes. Users will see long request times while requests wait for the background database flush to finish.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;WORKAROUNDS&lt;/b&gt;&lt;br/&gt;
N/A&lt;/p&gt;

&lt;p&gt;&lt;b&gt;AFFECTED VERSIONS&lt;/b&gt;&lt;br/&gt;
All versions of MongoDB prior to 2.6.4 are affected by this issue.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;FIX VERSION&lt;/b&gt;&lt;br/&gt;
The fix is included in the 2.6.4 production release.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;RESOLUTION DETAILS&lt;/b&gt;&lt;br/&gt;
A unnecessary lock was removed from the product.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h6&gt;&lt;a name=&quot;Originaldescription&quot;&gt;&lt;/a&gt;Original description&lt;/h6&gt;

&lt;p&gt;MongoDB has low CPU usage and does not process requests while a background flush is proceeding.&lt;/p&gt;

&lt;p&gt;The cause of this has been identified as the following blocking chain:&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;T1: Generic Query Thread: Holds: Nothing, Acquires DBLock(R), Waits on T2&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;T2: WRITEDATAFILES Thread: Holds DBLock(W). Acquires: GlobalFlushMutex, Waits T3&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;T3: Flush: Holds Global Flush Mutex, Waits: I/O&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;The lock was originally added in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-7378&quot; title=&quot;Windows Azure logs errors and retries if WRITETODATAFILES and FlushViewOfFile run at the same time&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-7378&quot;&gt;&lt;del&gt;SERVER-7378&lt;/del&gt;&lt;/a&gt; to workaround a bug in the Windows Azure Storage driver . It has been confirmed by Microsoft that there is a bug in the driver that only affects (a) memory mapped files such as MongoDB databases which are (b) concurrently updated while flushing to (c) a drive that is hosted on a Azure disk that does not set host cache preference to read/write.&lt;/p&gt;

&lt;p&gt;We have removed the &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-7378&quot; title=&quot;Windows Azure logs errors and retries if WRITETODATAFILES and FlushViewOfFile run at the same time&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-7378&quot;&gt;&lt;del&gt;SERVER-7378&lt;/del&gt;&lt;/a&gt; workaround since it penalizes all Windows deployment scenarios, including all scenarios where there is no bug (like bare-metal, other cloud providers, etc).&lt;/p&gt;</description>
                <environment></environment>
        <key id="132661">SERVER-13681</key>
            <summary>MongoDB stalls during background flush on Windows</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="9">Done</resolution>
                                        <assignee username="mark.benvenuto@mongodb.com">Mark Benvenuto</assignee>
                                    <reporter username="mark.benvenuto@mongodb.com">Mark Benvenuto</reporter>
                        <labels>
                            <label>26qa</label>
                            <label>28qa</label>
                            <label>Windows</label>
                    </labels>
                <created>Tue, 22 Apr 2014 19:47:17 +0000</created>
                <updated>Wed, 11 Mar 2015 16:55:16 +0000</updated>
                            <resolved>Thu, 31 Jul 2014 03:34:32 +0000</resolved>
                                                    <fixVersion>2.6.4</fixVersion>
                    <fixVersion>2.7.5</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="675294" author="xgen-internal-githook" created="Tue, 29 Jul 2014 18:02:55 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kangas&apos;, u&apos;name&apos;: u&apos;Matt Kangas&apos;, u&apos;email&apos;: u&apos;matt.kangas@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13681&quot; title=&quot;MongoDB stalls during background flush on Windows&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13681&quot;&gt;&lt;del&gt;SERVER-13681&lt;/del&gt;&lt;/a&gt; Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-7378&quot; title=&quot;Windows Azure logs errors and retries if WRITETODATAFILES and FlushViewOfFile run at the same time&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-7378&quot;&gt;&lt;del&gt;SERVER-7378&lt;/del&gt;&lt;/a&gt; Prevent WRITETODATAFILES and FlushViewOfFile from running at the same time&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 5352345eda2ffa24a72af1d5bbaccaa32bcb1006&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d7637a71f401f2457db3caca8c8a03d9b46d1ed0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d7637a71f401f2457db3caca8c8a03d9b46d1ed0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="675272" author="matt.kangas@10gen.com" created="Tue, 29 Jul 2014 17:57:18 +0000"  >&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2ec547c158e1bd7e0339288e0b7ed33ba46e58f6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2ec547c158e1bd7e0339288e0b7ed33ba46e58f6&lt;/a&gt;&lt;br/&gt;
Branch: v2.6&lt;/p&gt;

&lt;p&gt;Author:     Matt Kangas &amp;lt;matt.kangas@mongodb.com&amp;gt;&lt;br/&gt;
AuthorDate: Fri Jul 25 14:35:12 2014 -0400&lt;br/&gt;
Commit:     Matt Kangas &amp;lt;matt.kangas@mongodb.com&amp;gt;&lt;br/&gt;
CommitDate: Tue Jul 29 13:51:38 2014 -0400&lt;/p&gt;

&lt;p&gt;    Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-7378&quot; title=&quot;Windows Azure logs errors and retries if WRITETODATAFILES and FlushViewOfFile run at the same time&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-7378&quot;&gt;&lt;del&gt;SERVER-7378&lt;/del&gt;&lt;/a&gt; Prevent WRITETODATAFILES and FlushViewOfFile from running at the same time&quot;&lt;/p&gt;

&lt;p&gt;    This reverts commit 5352345eda2ffa24a72af1d5bbaccaa32bcb1006&lt;/p&gt;</comment>
                            <comment id="670760" author="xgen-internal-githook" created="Thu, 24 Jul 2014 22:29:00 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;markbenvenuto&apos;, u&apos;name&apos;: u&apos;Mark Benvenuto&apos;, u&apos;email&apos;: u&apos;mark.benvenuto@mongodb.com&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13681&quot; title=&quot;MongoDB stalls during background flush on Windows&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13681&quot;&gt;&lt;del&gt;SERVER-13681&lt;/del&gt;&lt;/a&gt;: Remove lock that was an incorrect workaround for Azure Drive write size limitations.&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 78c068e5d63d77648954252a785b3673d6e314b7.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 231262fda82a3245b8690fdc6421ea1fa3a8a2dd)&lt;br/&gt;
Branch: v2.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d2ca93b7a52be546df68ec6a5343ccbffd4ca8b3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d2ca93b7a52be546df68ec6a5343ccbffd4ca8b3&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="670616" author="xgen-internal-githook" created="Thu, 24 Jul 2014 20:43:25 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;markbenvenuto&apos;, u&apos;name&apos;: u&apos;Mark Benvenuto&apos;, u&apos;email&apos;: u&apos;mark.benvenuto@mongodb.com&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13681&quot; title=&quot;MongoDB stalls during background flush on Windows&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13681&quot;&gt;&lt;del&gt;SERVER-13681&lt;/del&gt;&lt;/a&gt;: Remove lock that was an incorrect workaround for Azure Drive write size limitations.&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 78c068e5d63d77648954252a785b3673d6e314b7.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/231262fda82a3245b8690fdc6421ea1fa3a8a2dd&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/231262fda82a3245b8690fdc6421ea1fa3a8a2dd&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="663487" author="andrew.emil@10gen.com" created="Fri, 18 Jul 2014 19:21:13 +0000"  >&lt;p&gt;Added new logs and etl file. Log is named &quot;log&quot;, etl file is named &quot;profile2.etl&quot;&lt;/p&gt;</comment>
                            <comment id="663425" author="andrew.emil@10gen.com" created="Fri, 18 Jul 2014 18:28:31 +0000"  >&lt;p&gt;Sample log uploaded, trying to get more detailed logs using xperf now&lt;/p&gt;</comment>
                            <comment id="663422" author="andrew.emil@10gen.com" created="Fri, 18 Jul 2014 18:26:19 +0000"  >&lt;p&gt;Was able to reproduce this issue on 2.6.4-pre (32ae9aa4f46eb95b4d70b7f69a1e84bc95a1a5d1) running with --nojournal&lt;/p&gt;

&lt;p&gt;Reproduction environment:&lt;br/&gt;
Windows Server 2012 R2 Datacenter&lt;br/&gt;
Azure &quot;Standard A2&quot; 2 core 3.5GB RAM &lt;br/&gt;
50gig No-Caching storage&lt;/p&gt;</comment>
                            <comment id="623612" author="xgen-internal-githook" created="Mon, 16 Jun 2014 21:34:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;markbenvenuto&apos;, u&apos;name&apos;: u&apos;Mark Benvenuto&apos;, u&apos;email&apos;: u&apos;mark.benvenuto@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13681&quot; title=&quot;MongoDB stalls during background flush on Windows&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13681&quot;&gt;&lt;del&gt;SERVER-13681&lt;/del&gt;&lt;/a&gt;: Remove lock that was an incorrect workaround for Azure Drive write size limitations.&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Limit flushes to 2MB chunks to prevent hitting a limitation in&lt;br/&gt;
Azure Network Drives (XDrive) which have a 2MB file write size limitation.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;(cherry picked from commit 78c068e5d63d77648954252a785b3673d6e314b7)&lt;br/&gt;
Branch: v2.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4a990e69f02498e707059aff4359fb95c605814a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4a990e69f02498e707059aff4359fb95c605814a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="610458" author="xgen-internal-githook" created="Thu, 5 Jun 2014 23:07:37 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;markbenvenuto&apos;, u&apos;name&apos;: u&apos;Mark Benvenuto&apos;, u&apos;email&apos;: u&apos;mark.benvenuto@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13681&quot; title=&quot;MongoDB stalls during background flush on Windows&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13681&quot;&gt;&lt;del&gt;SERVER-13681&lt;/del&gt;&lt;/a&gt;: Remove lock that was an incorrect workaround for Azure Drive write size limitations.&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Limit flushes to 2MB chunks to prevent hitting a limitation in&lt;br/&gt;
Azure Network Drives (XDrive) which have a 2MB file write size limitation.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/78c068e5d63d77648954252a785b3673d6e314b7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/78c068e5d63d77648954252a785b3673d6e314b7&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</comment>
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                                                        </outwardlinks>
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                                        <issuelink>
            <issuekey id="78098">SERVER-9868</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="114461">SERVER-12880</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="128814">SERVER-13444</issuekey>
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            <issuekey id="71861">SERVER-9355</issuekey>
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                                        <issuelink>
            <issuekey id="149821">DOCS-3841</issuekey>
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                            <attachment id="48056" name="log" size="9287" author="andrew.emil@10gen.com" created="Fri, 18 Jul 2014 19:21:13 +0000"/>
                            <attachment id="48048" name="log.2014-07-18T17-42-40" size="6954" author="andrew.emil@10gen.com" created="Fri, 18 Jul 2014 18:28:30 +0000"/>
                            <attachment id="48057" name="profile2.etl" size="6684672" author="andrew.emil@10gen.com" created="Fri, 18 Jul 2014 19:21:13 +0000"/>
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