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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-57100] Investigate critical section timeout error for ReshardCollection.yml genny workload</title>
                <link>https://jira.mongodb.org/browse/SERVER-57100</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;While attempting to reshard a collection in the &lt;a href=&quot;https://github.com/mongodb/genny/blob/master/src/workloads/sharding/ReshardCollection.yml&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/genny/blob/master/src/workloads/sharding/ReshardCollection.yml&lt;/a&gt; workload we experienced the following error in multiple runs:&lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;genny::What*&amp;#93;&lt;/span&gt; = Resharding critical section timed out.: generic server error&lt;/p&gt;

&lt;p&gt;The log messages in the genny output are sparse. The purpose of this ticket is to investigate why the failures occurred, add additional logging if required, and identify appropriate t2 or other metrics to assist in diagnosing future issues.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1738243">SERVER-57100</key>
            <summary>Investigate critical section timeout error for ReshardCollection.yml genny workload</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="kshitij.gupta@mongodb.com">Kshitij Gupta</assignee>
                                    <reporter username="lamont.nelson@mongodb.com">Lamont Nelson</reporter>
                        <labels>
                            <label>PM-234-M3</label>
                            <label>PM-234-T-autocommits</label>
                            <label>post-rc0</label>
                    </labels>
                <created>Thu, 20 May 2021 18:56:22 +0000</created>
                <updated>Wed, 2 Jun 2021 22:50:17 +0000</updated>
                            <resolved>Wed, 2 Jun 2021 22:49:24 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="3855354" author="JIRAUSER1253399" created="Wed, 2 Jun 2021 22:49:24 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57303&quot; title=&quot;Create transaction history iterator stage for Resharding&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57303&quot;&gt;&lt;del&gt;SERVER-57303&lt;/del&gt;&lt;/a&gt; was created to track the performance fix and &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57276&quot; title=&quot;Capture max/min percent complete in FTDC metrics as seen by the commit monitor&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57276&quot;&gt;&lt;del&gt;SERVER-57276&lt;/del&gt;&lt;/a&gt; was created to track the remaining operation time metric that the commit monitor sees.&lt;/p&gt;</comment>
                            <comment id="3845327" author="lamont.nelson" created="Thu, 27 May 2021 16:30:23 +0000"  >&lt;p&gt;We did observe the reported estimated time decaying as expected. We need to verify that these values are reasonable. &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kshitij.gupta&quot; class=&quot;user-hover&quot; rel=&quot;kshitij.gupta&quot;&gt;kshitij.gupta&lt;/a&gt; Can you post those log lines and the graphs for resharding metrics from your experiments in this ticket? It seems clear that the fetcher&apos;s query to obtain more work is having issues.&lt;/p&gt;</comment>
                            <comment id="3806719" author="lamont.nelson" created="Fri, 21 May 2021 20:15:42 +0000"  >&lt;p&gt;We looked at the failure data and determined that the incoming write workload may have been faster than the rate of applying the oplogs on the recipient. It would be useful to know what was the estimated time to completion the recipients reported over time.&lt;/p&gt;

&lt;p&gt;There was also a check point nearby the point where we started blocking writes. I&apos;m not sure if this is relevant, but mentioning it here anyway.&lt;/p&gt;

&lt;p&gt;Metric to add to server status: t2 metric for recipients to show the estimated remaining operationTime&lt;/p&gt;


</comment>
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            <issuekey id="1760264">SERVER-57276</issuekey>
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