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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>
    </build-info>


<item>
            <title>[SERVER-8840] Release distributed locks if shard shuts itself down during a migration</title>
                <link>https://jira.mongodb.org/browse/SERVER-8840</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If a shard primary purposely shuts itself down during a migration (usually because of a problem communicating with the config servers while in the critical section), we should release all distributed locks while shutting down so that future migrations aren&apos;t blocked after the shard recovers (from RS failover and/or by manually bringing the primary back online).&lt;/p&gt;</description>
                <environment></environment>
        <key id="67217">SERVER-8840</key>
            <summary>Release distributed locks if shard shuts itself down during a migration</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="9">Done</resolution>
                                        <assignee username="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                    </labels>
                <created>Mon, 4 Mar 2013 16:52:39 +0000</created>
                <updated>Tue, 6 Dec 2022 05:23:38 +0000</updated>
                            <resolved>Thu, 12 Jul 2018 18:46:30 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1945907" author="greg.mckeon" created="Thu, 12 Jul 2018 18:46:30 +0000"  >&lt;p&gt;As of 3.4, the config server now holds the balancer lock.&lt;/p&gt;</comment>
                            <comment id="305311" author="spencer" created="Wed, 3 Apr 2013 19:01:25 +0000"  >&lt;p&gt;Yep, I&apos;m an idiot, it absolutely does time out after 15 minutes and reclaim the lock.&lt;/p&gt;

&lt;p&gt;Per conversation with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=greg_10gen&quot; class=&quot;user-hover&quot; rel=&quot;greg_10gen&quot;&gt;greg_10gen&lt;/a&gt;, modifying the focus of the ticket slightly to focus on releasing the lock when we purposely shut down mid-migration.&lt;/p&gt;</comment>
                            <comment id="304599" author="eliot" created="Tue, 2 Apr 2013 22:22:34 +0000"  >&lt;p&gt;All distributed locks timeout, why isn&apos;t the regular timeout working in this case?&lt;/p&gt;</comment>
                            <comment id="304591" author="spencer" created="Tue, 2 Apr 2013 22:17:01 +0000"  >&lt;p&gt;Another option for recovery would be for the shards to have a command that indicates whether they have any in-progress migrations, and the balancer could run that command against the shards involved in the last known migration when considering forcing the lock.&lt;/p&gt;</comment>
                            <comment id="304583" author="sumsionjg@familysearch.org" created="Tue, 2 Apr 2013 22:10:06 +0000"  >&lt;p&gt;This thread was useful in recovering from this:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;&lt;a href=&quot;https://groups.google.com/forum/?fromgroups=#!topic/mongodb-user/TFuP_rlPPvQ&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://groups.google.com/forum/?fromgroups=#!topic/mongodb-user/TFuP_rlPPvQ&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="304581" author="sumsionjg@familysearch.org" created="Tue, 2 Apr 2013 22:08:45 +0000"  >&lt;p&gt;I hit this while pre-splitting chunks when preparing for a mass-import.  In my case the moveChunk() failed with an error like:&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;   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;&quot;exception: DBClientBase::findN: transport error: ip189:27017 ns: admin.$cmd query: { moveChunk: \&quot;eureka.person\&quot;, from: \&quot;rs12/ip191:27017,ip214:27017,ip189:27017\&quot;, to: \&quot;rs05/ip175:27017,ip240:27017,ip120:27017\&quot;, fromShard: \&quot;rs12\&quot;, toShard: \&quot;rs05\&quot;, min: { _id: \&quot;G3P-VHMM\&quot; }, max: { _id: \&quot;G4L-GY9M\&quot; }, maxChunkSizeBytes: 67108864, shardId: \&quot;eureka.person-_id_\&quot;G3P-VHMM\&quot;\&quot;, configdb: \&quot;ip232:27019,ip211:27019,ip129:27019\&quot;, secondaryThrottle: false, waitForDelete: false }&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;After looking in the logs, I saw that the ip189 had gone down during the moveChunk, socket error communicating with one of the config nodes.  I&apos;ll attach a log from the box that died, and from the config server.&lt;/p&gt;

&lt;p&gt;I know this is just one of the possible situations that could cause this, but perhaps it&apos;s helpful in fixing this.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="292040">SERVER-24431</issuekey>
        </issuelink>
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                                    </issuelinktype>
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                <attachments>
                            <attachment id="25555" name="config.log" size="845651" author="sumsionjg@familysearch.org" created="Tue, 2 Apr 2013 22:09:22 +0000"/>
                            <attachment id="25554" name="moveChunk-crash.log" size="9218" author="sumsionjg@familysearch.org" created="Tue, 2 Apr 2013 22:09:22 +0000"/>
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