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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-75790] ShardServerOpObserver does not correctly identify if it&apos;s acting as primary or secondary</title>
                <link>https://jira.mongodb.org/browse/SERVER-75790</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;ShardServerOpObserver uses `&lt;a href=&quot;https://github.com/mongodb/mongo/blob/600f07dda26241ef255f916995f59e6b1398309b/src/mongo/db/s/shard_server_op_observer.cpp#L65-L72&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;isStandaloneOrPrimary&lt;/a&gt;` to identify if the observed write was done by this node itself (i.e. primary) or from secondary oplog application.&lt;/p&gt;

&lt;p&gt;However, the implementation of `isStandaloneOrPrimary` is flawed: It uses ReplicationCoordinator::getMemberState, which turns RS_PRIMARY as soon as the node wins the election. However, the newly-elected node may still be draining oplog. In that situation, the observer should still behave in &quot;secondary&quot; mode.&lt;/p&gt;

&lt;p&gt;The correct way to implement `isStandaloneOrPrimary` is to use ReplicationCoordinator::canAcceptWritesFor (which &lt;a href=&quot;https://github.com/mongodb/mongo/blob/600f07dda26241ef255f916995f59e6b1398309b/src/mongo/db/op_observer/user_write_block_mode_op_observer.cpp#L43-L46&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;other op_observers already use&lt;/a&gt;). `canAcceptWritesFor` will only turn true after oplog has been drained.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2308805">SERVER-75790</key>
            <summary>ShardServerOpObserver does not correctly identify if it&apos;s acting as primary or secondary</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="13201">Fixed</resolution>
                                        <assignee username="jordi.serra-torrens@mongodb.com">Jordi Serra Torrens</assignee>
                                    <reporter username="jordi.serra-torrens@mongodb.com">Jordi Serra Torrens</reporter>
                        <labels>
                    </labels>
                <created>Thu, 6 Apr 2023 15:35:18 +0000</created>
                <updated>Sun, 29 Oct 2023 21:23:29 +0000</updated>
                            <resolved>Tue, 11 Apr 2023 10:35:15 +0000</resolved>
                                    <version>5.0.0</version>
                    <version>6.0.0</version>
                                    <fixVersion>7.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5337545" author="xgen-internal-githook" created="Tue, 11 Apr 2023 10:34:14 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Jordi Serra Torrens&apos;, &apos;email&apos;: &apos;jordi.serra-torrens@mongodb.com&apos;, &apos;username&apos;: &apos;jordist&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-75790&quot; title=&quot;ShardServerOpObserver does not correctly identify if it&amp;#39;s acting as primary or secondary&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-75790&quot;&gt;&lt;del&gt;SERVER-75790&lt;/del&gt;&lt;/a&gt; Use `canAcceptWritesForDatabase` on ShardServerOpObserver&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/feef2e9047a5642a899938fbbd70764f2143f268&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/feef2e9047a5642a899938fbbd70764f2143f268&lt;/a&gt;&lt;/p&gt;</comment>
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