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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-30888] Have FTDC code paths obtain locks with a timeout.</title>
                <link>https://jira.mongodb.org/browse/SERVER-30888</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&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;</description>
                <environment></environment>
        <key id="421828">SERVER-30888</key>
            <summary>Have FTDC code paths obtain locks with a timeout.</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="13201">Fixed</resolution>
                                        <assignee username="gregory.noma@mongodb.com">Gregory Noma</assignee>
                                    <reporter username="daniel.gottlieb@mongodb.com">Daniel Gottlieb</reporter>
                        <labels>
                    </labels>
                <created>Wed, 30 Aug 2017 14:45:00 +0000</created>
                <updated>Mon, 30 Oct 2023 23:13:56 +0000</updated>
                            <resolved>Mon, 1 Jun 2020 16:13:55 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                    <fixVersion>4.4.19</fixVersion>
                                    <component>Storage</component>
                                        <votes>1</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="5018173" author="xgen-internal-githook" created="Wed, 30 Nov 2022 11:45:20 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Noma&apos;, &apos;email&apos;: &apos;gregory.noma@gmail.com&apos;, &apos;username&apos;: &apos;gregorynoma&apos;}
&lt;p&gt;Message: &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; Obtain locks with timeouts when collecting FTDC statistics&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ccc77166c2a601956a0df94b3c9c61d508f5ebb8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ccc77166c2a601956a0df94b3c9c61d508f5ebb8&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3150349" author="xgen-internal-githook" created="Mon, 1 Jun 2020 16:20:44 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Noma&apos;, &apos;email&apos;: &apos;gregory.noma@gmail.com&apos;, &apos;username&apos;: &apos;gregorynoma&apos;}
&lt;p&gt;Message: &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; Obtain locks with timeouts when collecting FTDC statistics&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d74e83b8ab66d4584d4ab2082ee9c123f35dbfd2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d74e83b8ab66d4584d4ab2082ee9c123f35dbfd2&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1795528">SERVER-58026</issuekey>
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            <issuekey id="419197">SERVER-30790</issuekey>
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            <issuelink>
            <issuekey id="1839821">SERVER-59065</issuekey>
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            <issuekey id="2170473">SERVER-70971</issuekey>
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                            <customfieldvalue>This adds a new optional parameter &amp;#39;waitForLock&amp;#39; to the &amp;#39;collStats&amp;#39; command. The parameter defaults to &amp;#39;true&amp;#39;. When set to true (or by default), the behavior is unchanged from the existing behavior of &amp;#39;collStats&amp;#39; blocking behind its lock acquisition to collect statistics. When set to false, &amp;#39;collStats&amp;#39; will not block behind its lock acquisition. Instead, if the lock cannot be immediately acquired, the &amp;#39;collStats&amp;#39; command will still succeed but its response will not include any statistics. This new waitForLock=false mode is used by FTDC.</customfieldvalue>

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