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    <title>MongoDB Jira</title>
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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-36300] Audit re-use of operation contexts in mongos for metadata operations</title>
                <link>https://jira.mongodb.org/browse/SERVER-36300</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;A lot of transaction machinery on mongos relies on the operation context to attach transaction options to outgoing requests in the sharding task executor. If mongos re-uses the operation context used to send the client requests to shards to also send metadata operations / refreshes to the config server, it may be attaching transaction options to those requests as well. This could lead to strange behavior, like mongos believing the CSRS is a participant in a transaction, or possibly metadata refreshes being run as single replica set transactions.&lt;/p&gt;

&lt;p&gt;The purpose of this ticket is to figure out where mongos can use the same operation context for client requests and other operations, and to decide how to deal with this.&lt;/p&gt;

&lt;p&gt;An example is in the batch write path where initializing a ChunkManagerTargeter may involve &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r4.1.1/src/mongo/s/write_ops/chunk_manager_targeter.cpp#L323&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;creating a sharded collection through the config server&lt;/a&gt; using the same operation context that will eventually send the batch writes.&lt;/p&gt;</description>
                <environment></environment>
        <key id="576581">SERVER-36300</key>
            <summary>Audit re-use of operation contexts in mongos for metadata operations</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="jack.mulrow@mongodb.com">Jack Mulrow</assignee>
                                    <reporter username="jack.mulrow@mongodb.com">Jack Mulrow</reporter>
                        <labels>
                            <label>ShardedTxn:RouterSupport</label>
                    </labels>
                <created>Thu, 26 Jul 2018 14:54:27 +0000</created>
                <updated>Sun, 29 Oct 2023 22:29:31 +0000</updated>
                            <resolved>Fri, 19 Oct 2018 14:00:40 +0000</resolved>
                                                    <fixVersion>4.1.5</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2035819" author="jack.mulrow" created="Fri, 19 Oct 2018 14:00:40 +0000"  >&lt;p&gt;As of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37016&quot; title=&quot;Don&amp;#39;t stash TransactionRouter inside ShardingTaskExecutor&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37016&quot;&gt;&lt;del&gt;SERVER-37016&lt;/del&gt;&lt;/a&gt;, the &lt;tt&gt;MultiStatementTransactionRequestsSender&lt;/tt&gt; attaches transaction options instead of the sharding task executor, so the risk described in this ticket is substantially reduced. For instance, the example from the ticket description uses the Shard::runCommand interface, which does use the sharding task executor, but not the new enhanced ARS. As of now, the only places that use this version of the ARS that are not user commands are:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;&lt;tt&gt;establishCursors&lt;/tt&gt;&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;gatherResponses&lt;/tt&gt;&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;BatchWriteExec::executeBatch&lt;/tt&gt;&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;Of these, none seem to be used in ways that would unintentionally send transaction options, so I&apos;m closing this ticket as resolved.&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="576085">SERVER-36277</issuekey>
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