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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-66481] Failure to start an internal cross-shard transaction from a shardsvr mongod on behalf of a client that is already running a transaction</title>
                <link>https://jira.mongodb.org/browse/SERVER-66481</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The transaction API supports running an internal cross-shard transaction from a shardsvr mongod on behalf of a client regardless of the session configuration it is running with (i.e. the mongod acts a router). However, currently it is unable to do so if the client is running a transaction. The reason is that when starting a cross-shard transaction from a shardsvr mongod, the transaction API sends all the commands in the transaction through the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/59bec6ec49ecf623c70ef5fe78e3e9ad969bc160/src/mongo/db/cluster_transaction_api.cpp#L72&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;ServiceEntryPointMongos&lt;/a&gt; (i.e. the transaction is driven by the TransactionRouter for the client session on that mongod); the API currently always sends the first command in the transaction &lt;a href=&quot;https://github.com/mongodb/mongo/blob/59bec6ec49ecf623c70ef5fe78e3e9ad969bc160/src/mongo/db/transaction_api.cpp#L729&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;without startTransaction&lt;/a&gt; and this causes the transaction to fail with &lt;a href=&quot;https://github.com/mongodb/mongo/blob/59bec6ec49ecf623c70ef5fe78e3e9ad969bc160/src/mongo/s/transaction_router.cpp#L987-L993&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;NoSuchTransaction&lt;/a&gt; since the TransactionRouter is unaware of any ongoing transaction with that session id and transaction number (only the TransactionParticipant is). Making the API send the first command with startTransaction=true would allow the TransactionRouter on the mongod to successfully initialize the transaction. However, if the shard acting as a router for internal transaction also participates in the transaction, the first command to that shard would fail with &lt;a href=&quot;https://github.com/mongodb/mongo/blob/59bec6ec49ecf623c70ef5fe78e3e9ad969bc160/src/mongo/db/transaction_participant.cpp#L817-L820&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;ConflictingOperationInProgress&lt;/a&gt; since the TransactionRouter would send that command with startTransaction=true since it is unaware that the transaction has already started on that shard.&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2047264">SERVER-66481</key>
            <summary>Failure to start an internal cross-shard transaction from a shardsvr mongod on behalf of a client that is already running a transaction</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="13201">Fixed</resolution>
                                        <assignee username="jason.zhang@mongodb.com">Jason Zhang</assignee>
                                    <reporter username="cheahuychou.mao@mongodb.com">Cheahuychou Mao</reporter>
                        <labels>
                    </labels>
                <created>Mon, 16 May 2022 14:19:44 +0000</created>
                <updated>Sun, 29 Oct 2023 21:38:14 +0000</updated>
                            <resolved>Mon, 6 Jun 2022 23:30:26 +0000</resolved>
                                                    <fixVersion>6.0.0-rc10</fixVersion>
                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4612978" author="xgen-internal-githook" created="Mon, 13 Jun 2022 21:52:18 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jason Zhang&apos;, &apos;email&apos;: &apos;jason.zhang@mongodb.com&apos;, &apos;username&apos;: &apos;jz1242&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66481&quot; title=&quot;Failure to start an internal cross-shard transaction from a shardsvr mongod on behalf of a client that is already running a transaction&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66481&quot;&gt;&lt;del&gt;SERVER-66481&lt;/del&gt;&lt;/a&gt; Disable cross-shard internal transactions run from a shard&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 9e56fb40d86bab1a77ffa60fd8a94c4783735734)&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/895e8c6f612471da79c8e913d6d08f0e1b56c027&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/895e8c6f612471da79c8e913d6d08f0e1b56c027&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4598014" author="xgen-internal-githook" created="Mon, 6 Jun 2022 21:01:14 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jason Zhang&apos;, &apos;email&apos;: &apos;jason.zhang@mongodb.com&apos;, &apos;username&apos;: &apos;jz1242&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66481&quot; title=&quot;Failure to start an internal cross-shard transaction from a shardsvr mongod on behalf of a client that is already running a transaction&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66481&quot;&gt;&lt;del&gt;SERVER-66481&lt;/del&gt;&lt;/a&gt; Disable cross-shard internal transactions run from a shard&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9e56fb40d86bab1a77ffa60fd8a94c4783735734&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9e56fb40d86bab1a77ffa60fd8a94c4783735734&lt;/a&gt;&lt;/p&gt;</comment>
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