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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>[DOCS-9265] 3.4: Clarify multiple fsyncLock behavior  </title>
                <link>https://jira.mongodb.org/browse/DOCS-9265</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h5&gt;&lt;a name=&quot;DocumentationChanges&quot;&gt;&lt;/a&gt;Documentation Changes&lt;/h5&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Clarify that fsyncLock/fsyncUnlock tracks the number of open fsyncLocks. For example, &lt;tt&gt;fsyncLock(); fsyncLock(); fsyncUnlock();&lt;/tt&gt; stays locked.&lt;/li&gt;
	&lt;li&gt;Document &lt;tt&gt;lockCount&lt;/tt&gt; field of return document.&lt;/li&gt;
&lt;/ul&gt;


&lt;h5&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h5&gt;
&lt;p&gt;Currently (and historically) users could call fsyncLock multiple times which would then require the same number of fsyncUnlock calls to unlock the mongod instance. We should make this behavior clear in both our fsyncLock and fsyncUnlock documentation. I would recommend changing just for 3.4 as there exists a race condition that makes multiple lock/unlock unsafe prior to 3.4 (see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6302&quot; title=&quot;Race condition when multiple fsyncLock() invocations made on a mongod instance.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6302&quot;&gt;&lt;del&gt;SERVER-6302&lt;/del&gt;&lt;/a&gt;).&lt;/p&gt;

&lt;p&gt;Additionally, with the fix for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6302&quot; title=&quot;Race condition when multiple fsyncLock() invocations made on a mongod instance.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6302&quot;&gt;&lt;del&gt;SERVER-6302&lt;/del&gt;&lt;/a&gt; in 3.4 we added a &quot;lockCount&quot; field to the fsyncLock / fsyncUnlock result documents. This field contains the lock count after executing the command. In the fsyncUnlock case, a lockCount of &quot;0&quot; means the lock has been released and mongod can accept writes. We should reference this field and behavior in our documentation.&lt;/p&gt;</description>
                <environment></environment>
        <key id="328909">DOCS-9265</key>
            <summary>3.4: Clarify multiple fsyncLock behavior  </summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="james.wahlin@mongodb.com">James Wahlin</reporter>
                        <labels>
                    </labels>
                <created>Wed, 2 Nov 2016 20:49:47 +0000</created>
                <updated>Thu, 26 Jul 2018 03:09:23 +0000</updated>
                            <resolved>Thu, 29 Mar 2018 15:06:10 +0000</resolved>
                                                                        <due></due>
                            <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1849086" author="xgen-internal-githook" created="Thu, 29 Mar 2018 15:01:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;name&apos;: &apos;kay&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-9265&quot; title=&quot;3.4: Clarify multiple fsyncLock behavior  &quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-9265&quot;&gt;&lt;del&gt;DOCS-9265&lt;/del&gt;&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-5976&quot; title=&quot;fsyncLock documentation does not discuss behaviour of multiple locks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-5976&quot;&gt;&lt;del&gt;DOCS-5976&lt;/del&gt;&lt;/a&gt;: fsyncLock/Unlock and lock counts&lt;br/&gt;
Branch: v3.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/deb8aa5bb4731f46c6d93b45acc723d79c4b4c21&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/deb8aa5bb4731f46c6d93b45acc723d79c4b4c21&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1849082" author="xgen-internal-githook" created="Thu, 29 Mar 2018 14:59:43 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;name&apos;: &apos;kay&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-9265&quot; title=&quot;3.4: Clarify multiple fsyncLock behavior  &quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-9265&quot;&gt;&lt;del&gt;DOCS-9265&lt;/del&gt;&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-5976&quot; title=&quot;fsyncLock documentation does not discuss behaviour of multiple locks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-5976&quot;&gt;&lt;del&gt;DOCS-5976&lt;/del&gt;&lt;/a&gt;: fsyncLock/Unlock and lock counts&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/de4e26dc99160a8e5024b5d7810dcd45089dc79a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/de4e26dc99160a8e5024b5d7810dcd45089dc79a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1440064" author="james.wahlin@10gen.com" created="Tue, 22 Nov 2016 14:48:05 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=andrew.aldridge&quot; class=&quot;user-hover&quot; rel=&quot;andrew.aldridge&quot;&gt;andrew.aldridge&lt;/a&gt; - looks like &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-5976&quot; title=&quot;fsyncLock documentation does not discuss behaviour of multiple locks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-5976&quot;&gt;&lt;del&gt;DOCS-5976&lt;/del&gt;&lt;/a&gt; is a partial-duplicate of this ticket.&lt;/p&gt;</comment>
                            <comment id="1427879" author="allison.moore@10gen.com" created="Mon, 7 Nov 2016 14:49:08 +0000"  >&lt;p&gt;To you for grooming, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=andrew.aldridge&quot; class=&quot;user-hover&quot; rel=&quot;andrew.aldridge&quot;&gt;andrew.aldridge&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
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                                                                <inwardlinks description="is duplicated by">
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            <issuekey id="224162">DOCS-5976</issuekey>
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            <issuekey id="43380">SERVER-6302</issuekey>
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