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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-47086] Kill cursors when transitioning to rollback</title>
                <link>https://jira.mongodb.org/browse/SERVER-47086</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Exhaust cursors have a short period of time in between &apos;find&apos; and &apos;getMore&apos;s where the cursor is not actively running operations. Rollback currently doesn&apos;t kill cursors that have no actively running operation.&lt;/p&gt;

&lt;p&gt;This means that a cursor for oplog fetching might not be killed when a node&apos;s sync source transitions to rollback. The sync source could roll back the syncing node&apos;s minValid, meaning it is no longer a valid sync source for the syncing node. Since the syncing node only checks the sync source&apos;s rbid for rollback &lt;a href=&quot;https://github.com/mongodb/mongo/blob/52aa42a9f55b4d852d16cd1a53a1fdafda754129/src/mongo/db/repl/oplog_fetcher.cpp#L143-L151&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;after receiving the first batch&lt;/a&gt;, it would not stop fetching from its potentially invalid sync source.&lt;/p&gt;

&lt;p&gt;We should kill cursors when entering rollback so that the syncing node needs to find a new sync source.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1289125">SERVER-47086</key>
            <summary>Kill cursors when transitioning to rollback</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="samy.lanka@mongodb.com">Samyukta Lanka</reporter>
                        <labels>
                    </labels>
                <created>Tue, 24 Mar 2020 19:17:56 +0000</created>
                <updated>Tue, 6 Dec 2022 02:32:01 +0000</updated>
                            <resolved>Mon, 30 Mar 2020 17:23:41 +0000</resolved>
                                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2996175" author="judah.schvimer" created="Wed, 25 Mar 2020 15:21:40 +0000"  >&lt;p&gt;That is my understanding of the impact.  This will also only happen for rollback via refetch.&lt;/p&gt;</comment>
                            <comment id="2995887" author="tess.avitabile" created="Wed, 25 Mar 2020 13:31:26 +0000"  >&lt;p&gt;Is the impact that the syncing node may stay in RECOVERING forever? Or is there something worse that could happen?&lt;/p&gt;</comment>
                            <comment id="2994969" author="samy.lanka" created="Tue, 24 Mar 2020 20:35:43 +0000"  >&lt;p&gt;If its cursor is killed, the oplog fetcher will follow its retry policy and &lt;a href=&quot;https://github.com/mongodb/mongo/blob/51b338ad41653a8188adcc67b682ea12bbe63b4d/src/mongo/db/repl/oplog_fetcher.cpp#L505-L508&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;create a new cursor&lt;/a&gt; with the same sync source. This could cause a delay between the sync source rolling back and the syncing node seeking a new sync source.&lt;/p&gt;</comment>
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