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    <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-49044] Make AsyncRequestSender not retry remote command requests with startTransaction=true</title>
                <link>https://jira.mongodb.org/browse/SERVER-49044</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The AsyncRequestSender can &lt;a href=&quot;https://github.com/mongodb/mongo/blob/6eae2c14a0259c0d54b25c3ec2aa513bdca2c818/src/mongo/s/async_requests_sender.cpp#L277&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;retry&lt;/a&gt; a remote command request on retriable errors up to kMaxNumFailedHostRetryAttempts times. Based on BF-17754, it is not safe for the ARS to retry remote commands that are run inside transactions since it can lead to a crash in the following case:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;There is an unprepared transaction that gets&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/b2f840c9efca29820fb48a89741fa18ace8a33b1/src/mongo/db/repl/replication_coordinator_impl.cpp#L2490&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;aborted&lt;/a&gt;&#160;by the RstlKillOpThread on stepdown and the command fails with InterruptedDueToReplStateChange.&lt;/li&gt;
	&lt;li&gt;The ARS&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/56d94a679860c827f8f442675193b9ee2f4d4c49/src/mongo/s/async_requests_sender.cpp#L276-L292&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;retries&lt;/a&gt;&#160;the remote command request for that transaction statement (with&#160;&lt;tt&gt;startTransaction: true&lt;/tt&gt;) against the new primary and the transaction gets committed with two-phase commit.&lt;/li&gt;
	&lt;li&gt;The transaction state in the old primary&#8217;s TransactionParticipant is still AbortedWithoutPrepare when the oplog entry for prepare gets replicated to the old primary so the transaction state assertion&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/f341f3648e180a63ab8e30529cc5f26f93076200/src/mongo/db/transaction_participant.cpp#L1693&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;&#160;fails and the op applier fails this&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/82fd62e031f46a2c0e919f512df70c4de0b0d151/src/mongo/db/repl/oplog_applier_impl.cpp#L501&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;fatal assertion&lt;/a&gt;.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;So the ARS should check to see if the operation with &lt;a href=&quot;https://github.com/mongodb/mongo/blob/07169364c2aece0fb99f4a97b796196edb033efa/src/mongo/db/operation_context.h#L425&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;startTransaction=true&lt;/a&gt;&#160;and not retry if it is. There is already a rough &lt;a href=&quot;https://mongodbcr.appspot.com/601250001/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;CR patch&lt;/a&gt; for testing this case.&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1387321">SERVER-49044</key>
            <summary>Make AsyncRequestSender not retry remote command requests with startTransaction=true</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="luis.osta@mongodb.com">Luis Osta</assignee>
                                    <reporter username="cheahuychou.mao@mongodb.com">Cheahuychou Mao</reporter>
                        <labels>
                    </labels>
                <created>Tue, 23 Jun 2020 19:53:54 +0000</created>
                <updated>Sun, 29 Oct 2023 22:06:37 +0000</updated>
                            <resolved>Wed, 15 Jul 2020 14:39:03 +0000</resolved>
                                                    <fixVersion>4.4.1</fixVersion>
                    <fixVersion>4.7.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3334075" author="xgen-internal-githook" created="Wed, 12 Aug 2020 04:58:04 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Luis Osta&apos;, &apos;email&apos;: &apos;luis.osta@mongodb.com&apos;, &apos;username&apos;: &apos;LuisOsta&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-49044&quot; title=&quot;Make AsyncRequestSender not retry remote command requests with startTransaction=true&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-49044&quot;&gt;&lt;del&gt;SERVER-49044&lt;/del&gt;&lt;/a&gt; Make AsyncRequestSender not retry remote command requests with startTransaction=true&lt;/p&gt;

&lt;p&gt;(cherry picked from commit e4ad46c0fab6ce2b633f212db65ab5479c4c191e)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/290fc62c9574828bb2c176a794f311935b31e8d4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/290fc62c9574828bb2c176a794f311935b31e8d4&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3286483" author="xgen-internal-githook" created="Wed, 15 Jul 2020 16:30:28 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Luis Osta&apos;, &apos;email&apos;: &apos;luis.osta@mongodb.com&apos;, &apos;username&apos;: &apos;LuisOsta&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-49044&quot; title=&quot;Make AsyncRequestSender not retry remote command requests with startTransaction=true&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-49044&quot;&gt;&lt;del&gt;SERVER-49044&lt;/del&gt;&lt;/a&gt; Make AsyncRequestSender not retry remote command requests with startTransaction=true&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e4ad46c0fab6ce2b633f212db65ab5479c4c191e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e4ad46c0fab6ce2b633f212db65ab5479c4c191e&lt;/a&gt;&lt;/p&gt;</comment>
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