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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-34608] Drivers may still see ismaster=true from primary in midst of stepping down immediately after operations are killed with InterruptedDueToReplStateChange</title>
                <link>https://jira.mongodb.org/browse/SERVER-34608</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/b48579fcba7dfe3c7178b60c88feec96955c02f7/src/mongo/db/repl/replication_coordinator_impl.cpp#L1587-L1615&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;ReplicationCoordinatorImpl::stepDown()&lt;/tt&gt;&lt;/a&gt; calls &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b48579fcba7dfe3c7178b60c88feec96955c02f7/src/mongo/db/repl/replication_coordinator_external_state_impl.cpp#L644&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;ReplicationCoordinatorExternalStateImpl::killAllUserOperations()&lt;/tt&gt;&lt;/a&gt; prior to calling &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b48579fcba7dfe3c7178b60c88feec96955c02f7/src/mongo/db/repl/topology_coordinator.cpp#L1866&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;TopologyCoordinator::prepareForStepDownAttempt()&lt;/tt&gt;&lt;/a&gt;.&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;auto globalLock = stdx::make_unique&amp;lt;Lock::GlobalLock&amp;gt;(&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    opCtx, MODE_X, stepDownUntil, Lock::GlobalLock::EnqueueOnly());&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// We&apos;ve requested the global exclusive lock which will stop new operations from coming in,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// but existing operations could take a long time to finish, so kill all user operations&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// to help us get the global lock faster.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;_externalState-&amp;gt;killAllUserOperations(opCtx);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;...&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;status = _topCoord-&amp;gt;prepareForStepDownAttempt();&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;The implications of the current behavior w.r.t. retryable writes are that server selection may choose to retry the write operation against the primary in the midst of stepping down. Since the global X lock is held for the duration of the primary&apos;s stepdown attempt, the retry attempt will be blocked on the server until &lt;tt&gt;ReplicationCoordinatorExternalStateImpl::closeConnections()&lt;/tt&gt; (and thus &lt;tt&gt;ServiceEntryPoint::endAllSessions()&lt;/tt&gt;) has been called. A driver would then see a network error but wouldn&apos;t retry the operation for yet another time because it has exhausted its one retry attempt quota.&lt;/p&gt;

&lt;p&gt;For comparison: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/9dbed1bc8108798bebc8ae7a0b56fa4858335146/jstests/replsets/rslib.js#L124-L125&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;The &lt;tt&gt;reconnect()&lt;/tt&gt; function in &lt;tt&gt;jstests/replsets/rslib.js&lt;/tt&gt; works around this issue by retrying until it succeeds in running the &quot;collStats&quot; command&lt;/a&gt; because unlike the &quot;isMaster&quot; command, the &quot;collStats&quot; command requires acquiring the global lock and therefore must wait until the stepdown has finished.&lt;/p&gt;</description>
                <environment></environment>
        <key id="532248">SERVER-34608</key>
            <summary>Drivers may still see ismaster=true from primary in midst of stepping down immediately after operations are killed with InterruptedDueToReplStateChange</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="13202">Works as Designed</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="max.hirschhorn@mongodb.com">Max Hirschhorn</reporter>
                        <labels>
                            <label>former-quick-wins</label>
                    </labels>
                <created>Mon, 23 Apr 2018 04:09:10 +0000</created>
                <updated>Fri, 27 Oct 2023 13:53:51 +0000</updated>
                            <resolved>Fri, 7 Feb 2020 15:56:46 +0000</resolved>
                                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="2184076" author="matthew.russotto" created="Mon, 18 Mar 2019 17:47:08 +0000"  >&lt;p&gt;We believe the fix in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38456&quot; title=&quot;killSessionsLocalKillTransactions must filter for sessions with running transactions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38456&quot;&gt;&lt;del&gt;SERVER-38456&lt;/del&gt;&lt;/a&gt; which will prevent killing retryable writes when trying to kill transactions will result in the workaround working again.&lt;/p&gt;</comment>
                            <comment id="2181823" author="matthew.russotto" created="Fri, 15 Mar 2019 15:38:21 +0000"  >&lt;p&gt;We rejected this, but I believe the RSTL and stepdown changes mean we should reconsider.  The workaround of retrying twice no longer works because it is now possible for the retries to be killed (because we kill in a loop) any number of times.&lt;/p&gt;

&lt;p&gt;I also don&apos;t think we need to take a lock.  It is sufficient to immediately stop reporting isMaster before killing operations.&lt;/p&gt;</comment>
                            <comment id="1884733" author="spencer" created="Mon, 7 May 2018 16:04:24 +0000"  >&lt;p&gt;Discussed this with drivers and we agreed that making isMaster take locks in any situation is probably a bad idea.&#160; Instead drivers are going to work around this on their end - that work is tracked by SPEC-1072.&lt;/p&gt;</comment>
                            <comment id="1872068" author="spencer" created="Mon, 23 Apr 2018 22:37:03 +0000"  >&lt;p&gt;This is by design and unavoidable.  If drivers want to be able to wait until the stepdown process fully succeeds or fails, we could add a flag to isMaster which when set causes it to briefly take a Global IS lock and then release it, just to serialize the isMaster with ongoing stepdowns.  Drivers could then include this flag only when reconnecting to a node that just returned InterruptedDueToReplStateChange.  I&apos;m not sure if that&apos;s worth doing or not though.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="1754718">SERVER-57167</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="533680">SERVER-34666</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="2276352">SERVER-74409</issuekey>
        </issuelink>
                            </inwardlinks>
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