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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-5976] fsyncLock documentation does not discuss behaviour of multiple locks</title>
                <link>https://jira.mongodb.org/browse/DOCS-5976</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;If you issue multiple calls to &lt;tt&gt;db.fsyncLock&lt;/tt&gt;, each invocation takes a separate lock, and you need to ensure you pair an exact number (or greater number) of matching &lt;tt&gt;db.fsyncUnlock&lt;/tt&gt; commands to unlock things.&lt;/p&gt;

&lt;p&gt;This is not necessarily intuitive behaviour - many people might assume there are only two states - locked and unlocked, and that multiple calls to &lt;tt&gt;db.fsyncLock&lt;/tt&gt; whilst locked are simply idempotent (and similarly for &lt;tt&gt;db.fsyncUnclock&lt;/tt&gt;).&lt;/p&gt;

&lt;p&gt;The output of the commands also doesn&apos;t give any clues about this behaviour either:&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;
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						&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;&amp;gt; db.fsyncLock()&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;{&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;        &quot;info&quot; : &quot;now locked against writes, use db.fsyncUnlock() to unlock&quot;,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&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;        &quot;seeAlso&quot; : &quot;http://dochub.mongodb.org/core/fsynccommand&quot;,&lt;/span&gt;&lt;/pre&gt;
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						&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;        &quot;ok&quot; : 1&lt;/span&gt;&lt;/pre&gt;
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					&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;}&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p/&gt;
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&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;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;&amp;gt; db.fsyncUnlock()&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;   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;{ &quot;ok&quot; : 1, &quot;info&quot; : &quot;unlock completed&quot; }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;

&lt;p&gt;Nor is it mentioned on either the documentation for &lt;tt&gt;fsync&lt;/tt&gt; or &lt;tt&gt;db.fsyncLock&lt;/tt&gt;:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;&lt;a href=&quot;http://docs.mongodb.org/manual/reference/command/fsync/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/reference/command/fsync/&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;http://docs.mongodb.org/manual/reference/method/db.fsyncLock/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/reference/method/db.fsyncLock/&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Is it possible to document this behaviour in either/both of those locations?&lt;/p&gt;</description>
                <environment></environment>
        <key id="224162">DOCS-5976</key>
            <summary>fsyncLock documentation does not discuss behaviour of multiple locks</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="3">Duplicate</resolution>
                                        <assignee username="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="victor.hooi">Victor Hooi</reporter>
                        <labels>
                    </labels>
                <created>Wed, 5 Aug 2015 01:01:13 +0000</created>
                <updated>Mon, 30 Oct 2023 19:37:52 +0000</updated>
                            <resolved>Thu, 29 Mar 2018 02:18:28 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1849088" author="xgen-internal-githook" created="Thu, 29 Mar 2018 15:01:52 +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="1849083" author="xgen-internal-githook" created="Thu, 29 Mar 2018 14:59:45 +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="1848661" author="kay.kim@10gen.com" created="Thu, 29 Mar 2018 02:18:28 +0000"  >&lt;p&gt;Will do as part of 9265&lt;/p&gt;</comment>
                    </comments>
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