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    <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-34965] Fix mongos_merge.js by clearing the profiler before each set of tests </title>
                <link>https://jira.mongodb.org/browse/SERVER-34965</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Some of the test pipelines in &lt;tt&gt;mongos_merge.js&lt;/tt&gt; split in such a way that the shard cursors will not be exhausted by by time the merge half of the pipeline hits EOF, due to e.g. a merge-side &lt;tt&gt;$limit&lt;/tt&gt; stage. When this happens, the ARM will schedule an asynchronous &lt;tt&gt;killCursors&lt;/tt&gt; command to clean up the shard cursors.&lt;/p&gt;

&lt;p&gt;However, because &lt;tt&gt;mongos_merge.js&lt;/tt&gt;&#160;queries the &lt;tt&gt;system.profile&lt;/tt&gt; collection immediately after running the test pipeline to confirm whether the aggregation ran as expected, on rare occasions the asynchronous &lt;tt&gt;killCursors&lt;/tt&gt; command will reach the shard and be profiled while the test is scanning the profiler collection. If the capped &lt;tt&gt;system.profile&lt;/tt&gt; collection is already at capacity, this will cause the first entry to be removed from the collection to make space. If the test&apos;s query has yielded at the start of the capped collection when this occurs, then it will find that the collection has rolled past its last known point when it attempts to resume iteration, and will fail with &lt;tt&gt;CappedPositionLost&lt;/tt&gt; as a result.&lt;/p&gt;

&lt;p&gt;To fix this, we should ensure that the profiler is never full by clearing it before each set of tests.&lt;/p&gt;</description>
                <environment></environment>
        <key id="542795">SERVER-34965</key>
            <summary>Fix mongos_merge.js by clearing the profiler before each set of tests </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="bernard.gorman@mongodb.com">Bernard Gorman</assignee>
                                    <reporter username="bernard.gorman@mongodb.com">Bernard Gorman</reporter>
                        <labels>
                    </labels>
                <created>Fri, 11 May 2018 19:54:51 +0000</created>
                <updated>Sun, 29 Oct 2023 22:31:51 +0000</updated>
                            <resolved>Tue, 15 May 2018 22:47:36 +0000</resolved>
                                                    <fixVersion>4.0.0-rc0</fixVersion>
                                    <component>Testing Infrastructure</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1892319" author="xgen-internal-githook" created="Tue, 15 May 2018 22:45:23 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;bernard.gorman@gmail.com&apos;, &apos;username&apos;: &apos;gormanb&apos;, &apos;name&apos;: &apos;Bernard Gorman&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34965&quot; title=&quot;Fix mongos_merge.js by clearing the profiler before each set of tests &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34965&quot;&gt;&lt;del&gt;SERVER-34965&lt;/del&gt;&lt;/a&gt; Fix mongos_merge.js by clearing the profiler before each set of tests&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c751a7d30f394fc6daefebfbfe7538db9b1b6c89&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c751a7d30f394fc6daefebfbfe7538db9b1b6c89&lt;/a&gt;&lt;/p&gt;</comment>
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