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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-20361] Improve the behaviour of multi-update/delete against a sharded collection</title>
                <link>https://jira.mongodb.org/browse/SERVER-20361</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Multi-updates/deletes against a sharded collection are sent with shard version IGNORED against the set of all nodes which the given router thinks have chunks from that collection. Because of this, the following anomalies can happen:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;The update/delete is not applied against all documents in the collection (when the router doesn&apos;t know chunk was donated to another shard, not currently included in the cache)&lt;/li&gt;
	&lt;li&gt;The update/delete is applied multiple times on different shards for the same document (because the lack of versioning prevents them from synchronizing with chunk migration, in which case they can be applied both on the donor and the recipient)&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;This ticket is intended to serve as the generic catch-all of these issues.&lt;/p&gt;</description>
                <environment></environment>
        <key id="229242">SERVER-20361</key>
            <summary>Improve the behaviour of multi-update/delete against a sharded collection</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-cluster-scalability">Backlog - Cluster Scalability</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                            <label>sharding-causes-bfs-hard</label>
                    </labels>
                <created>Thu, 10 Sep 2015 21:43:58 +0000</created>
                <updated>Tue, 12 Dec 2023 15:49:43 +0000</updated>
                                            <version>2.6.11</version>
                    <version>3.0.6</version>
                    <version>3.1.7</version>
                                                    <component>Sharding</component>
                    <component>Write Ops</component>
                                        <votes>0</votes>
                                    <watches>25</watches>
                                                                                                                <comments>
                            <comment id="1195897" author="esha.maharishi@10gen.com" created="Tue, 8 Mar 2016 01:14:03 +0000"  >&lt;p&gt;After the commit in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22203&quot; title=&quot;remove shardVersion information and usages from BatchedCommandRequest&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22203&quot;&gt;&lt;del&gt;SERVER-22203&lt;/del&gt;&lt;/a&gt;, on multiUpdates and multiRemoves only the OperationShardVersion is used in checkShardVersion, and the OperationShardVersion is no longer set to IGNORED by the mongod.&lt;/p&gt;

&lt;p&gt;Instead, the mongos sends an IGNORED shard version if targeting multiple shards for a multiUpdate or multiRemove &lt;b&gt;without&lt;/b&gt; an equality match on the shard key.&lt;/p&gt;

&lt;p&gt;Therefore, this issue remains for non-idempotent multiUpdates &lt;b&gt;with&lt;/b&gt; an equality match on the shard key:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;mongos targets multiple shards for a non-idempotent multiUpdate with equality match on shard key&lt;/li&gt;
	&lt;li&gt;some chunks have moved, so StaleShardVersion is returned to mongos by some shard&lt;/li&gt;
	&lt;li&gt;mongos re-targets and re-sends the request, causing the update to be applied again on the re-targeted shards&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;As an aside, any time mongos targets multiple shards, it actually targets all shards. However, only shards containing the relevant data are affected by the re-applied write.&lt;/p&gt;</comment>
                            <comment id="1026836" author="spencer" created="Thu, 10 Sep 2015 21:47:47 +0000"  >&lt;p&gt;I believe the fix would be to simply get the version for checkShardVersion from the OperationShardVersion/ShardedConnectionInfo rather than the parsed BatchedUpdateRequest&lt;/p&gt;</comment>
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