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    <title>MongoDB Jira</title>
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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-63752] Make sure the shard merge never leaves an orphaned open backup cursor on donor.</title>
                <link>https://jira.mongodb.org/browse/SERVER-63752</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, we ignore errors that&apos;s returned for &lt;a href=&quot;https://github.com/10gen/mongo/blob/2d2d949ecb7e43c07833118361f21fb8731e7c4b/src/mongo/db/repl/tenant_migration_recipient_service.cpp#L905-L959&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;kill backup cursor command&lt;/a&gt;. So, shard merge can miss killing the backup cursor opened on the donor primary due to recipient primary shutdown or due to some transient n/w error. This would be bad, especially, when there is  an orphaned active backup cursor on donor on shard merge abort. Currently, we only allow one active open backup cursor on a node at any point of time. This would shard merge retry or backup service to cause outage.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1985072">SERVER-63752</key>
            <summary>Make sure the shard merge never leaves an orphaned open backup cursor on donor.</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="3">Duplicate</resolution>
                                        <assignee username="backlog-server-serverless">[DO NOT USE] Backlog - Server Serverless</assignee>
                                    <reporter username="suganthi.mani@mongodb.com">Suganthi Mani</reporter>
                        <labels>
                            <label>shard-merge-milestone-3</label>
                    </labels>
                <created>Wed, 16 Feb 2022 21:22:01 +0000</created>
                <updated>Fri, 3 Mar 2023 14:15:48 +0000</updated>
                            <resolved>Fri, 3 Mar 2023 14:15:48 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="4362215" author="suganthi.mani" created="Thu, 17 Feb 2022 18:42:43 +0000"  >&lt;p&gt;&lt;b&gt;Additional Notes:&lt;/b&gt;&lt;br/&gt;
Since by default we kill cursor if the cursor is idle for more than 10 minutes, the outage is not that bad, but we need to check with cloud the following things,&lt;br/&gt;
1)  If the cloud uses the default value (10 mins) for server parameter &lt;a href=&quot;https://github.com/10gen/mongo/blob/2d2d949ecb7e43c07833118361f21fb8731e7c4b/src/mongo/db/cursor_server_params.idl#L40&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;cursorTimeoutMillis&lt;/a&gt;?&lt;br/&gt;
2) If so, is the backup service outage tolerable?&lt;/p&gt;

&lt;p&gt;In case if the 10 mins is not tolerable, then the fix, I am suggesting is, recipient should retry running the &lt;tt&gt;killCursors&lt;/tt&gt; command on retryable errors and persist the backupCursorId in the state doc and make the new recipient primary to close the cursor (just to be noted, recipient primary opens a backup cursor not under a session, so it&apos;s ok to make the new recipient primary after failover to take the responsibility of closing the backup cursor)&lt;/p&gt;</comment>
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