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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-42138] Memory used by ChunkManager objects can grow without bound</title>
                <link>https://jira.mongodb.org/browse/SERVER-42138</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;ChunkManager objects are kept around as long as there is a query using them. If there are a lot of long-running queries and also a lot of chunk moves/splits/merges, this can lead to a build-up of ChunkManager objects in-memory which is unbounded. We should either optimize this somehow or put a cap on the memory used by the ChunkManager, or at the very least figure out how to issue a warning that there are a lot of ChunkManager objects.&lt;/p&gt;

&lt;p&gt;As a side note it could also be good to at least include the number of open metadata snapshots/ChunkManager objects in FTDC data since this has been a problem on several occasions.&lt;/p&gt;</description>
                <environment></environment>
        <key id="850117">SERVER-42138</key>
            <summary>Memory used by ChunkManager objects can grow without bound</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-server-sharding-emea">[DO NOT USE] Backlog - Sharding EMEA</assignee>
                                    <reporter username="matthew.saltz@mongodb.com">Matthew Saltz</reporter>
                        <labels>
                            <label>sharding-causes-bfs-hard</label>
                            <label>sharding-common-backlog</label>
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                <created>Wed, 10 Jul 2019 14:37:04 +0000</created>
                <updated>Mon, 5 Dec 2022 20:27:59 +0000</updated>
                            <resolved>Fri, 25 Nov 2022 11:15:54 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5007594" author="tommaso.tocci" created="Fri, 25 Nov 2022 11:15:54 +0000"  >&lt;p&gt;This is still a problem on master (6.2) but we believe that &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36443&quot; title=&quot;Long-running queries should not cause a build-up of unused ChunkManager objects&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36443&quot;&gt;&lt;del&gt;SERVER-36443&lt;/del&gt;&lt;/a&gt;, PM-2321 and PM-2323 reduced the likelihood that the ChunkManager will consume a lot of memory.&#160;&lt;/p&gt;</comment>
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