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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-13682] Investigate changes in SERVER-30888: Have FTDC code paths obtain locks with a timeout.</title>
                <link>https://jira.mongodb.org/browse/DOCS-13682</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;

    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;p&gt;    This adds a new optional parameter &apos;waitForLock&apos; to the &apos;collStats&apos; command. The parameter defaults to &apos;true&apos;. When set to true (or by default), the behavior is unchanged from the existing behavior of &apos;collStats&apos; blocking behind its lock acquisition to collect statistics. When set to false, &apos;collStats&apos; will not block behind its lock acquisition. Instead, if the lock cannot be immediately acquired, the &apos;collStats&apos; command will still succeed but its response will not include any statistics. This new waitForLock=false mode is used by FTDC.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;
&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    Currently FTDC takes out locks in two places (once when running WiredTiger and once when running with replication).&lt;br/&gt;
WiredTiger: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/1dc2afc8b5ce09d88535049df2ad72adc0434cc8/src/mongo/db/storage/wiredtiger/wiredtiger_server_status.cpp#L60&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/1dc2afc8b5ce09d88535049df2ad72adc0434cc8/src/mongo/db/storage/wiredtiger/wiredtiger_server_status.cpp#L60&lt;/a&gt;&lt;br/&gt;
Replication: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c1e7921e9d69bd9a37761deb58d119a324341a54/src/mongo/db/ftdc/ftdc_mongod.cpp#L47-L60&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/c1e7921e9d69bd9a37761deb58d119a324341a54/src/mongo/db/ftdc/ftdc_mongod.cpp#L47-L60&lt;/a&gt; which calls into &lt;a href=&quot;https://github.com/mongodb/mongo/blob/1dc2afc8b5ce09d88535049df2ad72adc0434cc8/src/mongo/db/stats/storage_stats.cpp#L57&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/1dc2afc8b5ce09d88535049df2ad72adc0434cc8/src/mongo/db/stats/storage_stats.cpp#L57&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Both can wait forever which can be undesirable for FDTC. Instead it may be useful to utilize &quot;tryLocks&quot; such that an FTDC round can make progress and output data despite some pieces blocking.&lt;/p&gt;

&lt;p&gt;However such a change would also affect &lt;tt&gt;serverStatus&lt;/tt&gt; output thus be an API change that can affect downstream callers.&lt;/p&gt;


&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
</description>
                <environment></environment>
        <key id="1368047">DOCS-13682</key>
            <summary>Investigate changes in SERVER-30888: Have FTDC code paths obtain locks with a timeout.</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="13203">Gone away</resolution>
                                        <assignee username="naomi.pentrel@mongodb.com">Naomi Pentrel</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Mon, 1 Jun 2020 16:13:55 +0000</created>
                <updated>Mon, 13 Nov 2023 18:04:46 +0000</updated>
                            <resolved>Thu, 19 Aug 2021 11:24:55 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                    <fixVersion>4.4.19</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5018543" author="edu.bot" created="Wed, 30 Nov 2022 14:02:37 +0000"  >&lt;p&gt;&lt;em&gt;Fix Version updated for upstream &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30888&quot; title=&quot;Have FTDC code paths obtain locks with a timeout.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30888&quot;&gt;&lt;del&gt;SERVER-30888&lt;/del&gt;&lt;/a&gt;:&lt;/em&gt; &lt;br/&gt;
4.7.0, 4.4.19&lt;/p&gt;</comment>
                            <comment id="4009267" author="naomi.pentrel" created="Thu, 19 Aug 2021 11:24:55 +0000"  >&lt;p&gt;Team no longer thinks this requires documentation:&lt;br/&gt;
&lt;a href=&quot;https://mongodbcr.appspot.com/816910001/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://mongodbcr.appspot.com/816910001/&lt;/a&gt;&lt;/p&gt;</comment>
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