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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-47184] replSetReconfig command should check if the node is primary before no-op write</title>
                <link>https://jira.mongodb.org/browse/SERVER-47184</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The replSetReconfig command does a no-op write, but does not check that the node is still primary before doing so. Since the command only takes a lock when writing down the config document, it is possible for the primary to stepdown and transition to secondary before doing this no-op write. &lt;/p&gt;

&lt;p&gt;We end up calling onInternalOpMessage, which will pass in an empty namespace. Because of this, we don&apos;t actually do the primary check in _logOpsInner. This would mean that we can allow the reconfig no-op write to occur on a secondary.&lt;/p&gt;

&lt;p&gt;This is tracked separately from &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47142&quot; title=&quot;Check primary before writing replset config and no-op&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47142&quot;&gt;&lt;del&gt;SERVER-47142&lt;/del&gt;&lt;/a&gt; since we would like to backport this change to 4.2 and earlier affected versions. &lt;/p&gt;</description>
                <environment></environment>
        <key id="1297176">SERVER-47184</key>
            <summary>replSetReconfig command should check if the node is primary before no-op write</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="siyuan.zhou@mongodb.com">Siyuan Zhou</assignee>
                                    <reporter username="pavithra.vetriselvan@mongodb.com">Pavithra Vetriselvan</reporter>
                        <labels>
                    </labels>
                <created>Mon, 30 Mar 2020 18:04:35 +0000</created>
                <updated>Mon, 11 May 2020 23:48:19 +0000</updated>
                            <resolved>Mon, 11 May 2020 23:48:19 +0000</resolved>
                                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="3077893" author="tess.avitabile" created="Mon, 11 May 2020 12:31:02 +0000"  >&lt;p&gt;Thank you, sounds good to me.&lt;/p&gt;</comment>
                            <comment id="3076522" author="siyuan.zhou@10gen.com" created="Fri, 8 May 2020 20:11:31 +0000"  >&lt;p&gt;This bug only occurs when a primary steps down after &lt;a href=&quot;http://10.1.2.40/mongodb_v4.2/source/src/mongo/db/repl/replication_coordinator_impl.cpp#2663&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;accepting a reconfig&lt;/a&gt; but before writing the no-op. That window including writing the config locally is narrow. Since both reconfig and stepdown are rare, their combination is extremely rare.&lt;/p&gt;

&lt;p&gt;When this happens, oplog application will complain that the oplog is out of order and fassert. That&apos;s how we observed this issue in build failures. Since this isn&apos;t reported anywhere even thought it exists in all earlier versions, I tend to close this as Won&apos;t Fix. CC &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=tess.avitabile&quot; class=&quot;user-hover&quot; rel=&quot;tess.avitabile&quot;&gt;tess.avitabile&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;On 4.4 and master, this has been fixed as part of Safe Reconfig project in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47142&quot; title=&quot;Check primary before writing replset config and no-op&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47142&quot;&gt;&lt;del&gt;SERVER-47142&lt;/del&gt;&lt;/a&gt;. &lt;/p&gt;</comment>
                            <comment id="3013491" author="pavithra.vetriselvan" created="Mon, 30 Mar 2020 18:07:09 +0000"  >&lt;p&gt;Note that this also exists on 4.0 and 3.6.&lt;/p&gt;</comment>
                    </comments>
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