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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>
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<item>
            <title>[SERVER-13729] Reads &amp; Writes are blocked during data file allocation on Windows</title>
                <link>https://jira.mongodb.org/browse/SERVER-13729</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 Jul 18, 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;
On Windows, all reads and writes are blocked during data file allocation due to unecessary locking.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;USER IMPACT&lt;/b&gt;&lt;br/&gt;
&lt;tt&gt;mongod&lt;/tt&gt; stops processing all requests until I/O is completed. This has a negative performance impact, and if the blocking is too long it can impact heartbeats on replica sets.&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;
MongoDB production releases up to 2.6.3 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;
Add a dedicated lock to handle the case of the race condition between &lt;tt&gt;_flushAll&lt;/tt&gt; and the file being closed.&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;
&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;
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					&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;
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				&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: AllocateFile Thread: Holds DBLock(W), Acquires: LockMongoFilesExclusive, 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 LockMongoFilesShared, Waits: I/O&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;

&lt;p&gt;&lt;em&gt;&lt;b&gt;Problem&lt;/b&gt;&lt;/em&gt;: The MemoryMappedFile class needs to support concurrency, but was not correctly implemented so the wrong lock was used which causes unneeded synchronization.&lt;br/&gt;
&lt;b&gt;&lt;em&gt;Fix&lt;/em&gt;&lt;/b&gt;: Add a dedicated lock to handle the case of the race condition between _flushAll, and the file being closed.&lt;br/&gt;
Introduced in the fix for &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;&lt;/p&gt;</description>
                <environment></environment>
        <key id="133228">SERVER-13729</key>
            <summary>Reads &amp; Writes are blocked during data file allocation 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>Windows</label>
                    </labels>
                <created>Thu, 24 Apr 2014 21:30:56 +0000</created>
                <updated>Wed, 11 Mar 2015 16:55:18 +0000</updated>
                            <resolved>Fri, 6 Jun 2014 04:21:50 +0000</resolved>
                                                    <fixVersion>2.6.4</fixVersion>
                    <fixVersion>2.7.2</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="623613" author="xgen-internal-githook" created="Mon, 16 Jun 2014 21:34:08 +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-13729&quot; title=&quot;Reads &amp;amp; Writes are blocked during data file allocation on Windows&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13729&quot;&gt;&lt;del&gt;SERVER-13729&lt;/del&gt;&lt;/a&gt;: Fix Data File Growth on Windows&lt;/p&gt;

&lt;p&gt;Reuse an existing lock to use as a lock to handle the race condition&lt;br/&gt;
between _flushAll, and the memory mapped file being closed instead&lt;br/&gt;
of holding LockMongoFilesxxx for an excessively long time.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit c4fa4dc85aec3b8dfd9ada7a58521d8f1bbf4fff)&lt;br/&gt;
Branch: v2.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c98867bc6805da23c35c5c827c96f27a6a349006&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c98867bc6805da23c35c5c827c96f27a6a349006&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="610459" author="xgen-internal-githook" created="Thu, 5 Jun 2014 23:07:40 +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-13729&quot; title=&quot;Reads &amp;amp; Writes are blocked during data file allocation on Windows&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13729&quot;&gt;&lt;del&gt;SERVER-13729&lt;/del&gt;&lt;/a&gt;: Fix Data File Growth on Windows&lt;/p&gt;

&lt;p&gt;Reuse an existing lock to use as a lock to handle the race condition&lt;br/&gt;
between _flushAll, and the memory mapped file being closed instead&lt;br/&gt;
of holding LockMongoFilesxxx for an excessively long time.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c4fa4dc85aec3b8dfd9ada7a58521d8f1bbf4fff&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c4fa4dc85aec3b8dfd9ada7a58521d8f1bbf4fff&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
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                                        <issuelink>
            <issuekey id="78098">SERVER-9868</issuekey>
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            <issuelink>
            <issuekey id="114461">SERVER-12880</issuekey>
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            <issuelink>
            <issuekey id="128814">SERVER-13444</issuekey>
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            <issuekey id="140937">SERVER-14198</issuekey>
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