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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-54626] Retryable writes may execute more than once in resharding if statements straddle the fetchTimestamp</title>
                <link>https://jira.mongodb.org/browse/SERVER-54626</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;div class=&apos;table-wrap&apos;&gt;
&lt;table class=&apos;confluenceTable&apos;&gt;&lt;tbody&gt;
&lt;tr&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;Donor 1&lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;Donor 2&lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;Coordinator&lt;/th&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;Donor 1 chooses minFetchTimestamp ts=10&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&amp;nbsp;&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&amp;nbsp;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;Donor 1 performs retryable write stmtId 1 at ts=20&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&amp;nbsp;&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&amp;nbsp;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;Donor 1 performs retryable write stmtId 2 at ts=30&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&amp;nbsp;&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&amp;nbsp;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&amp;nbsp;&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;Donor 2 chooses minFetchTimestamp ts=25&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&amp;nbsp;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&amp;nbsp;&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&amp;nbsp;&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;Coordinator chooses fetchTimestamp ts=25&lt;/td&gt;
&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;
&lt;/div&gt;


&lt;p&gt;leads to a sequence where the recipients won&apos;t have written an incomplete stmtId for the retryable write &lt;a href=&quot;https://github.com/mongodb/mongo/blob/23d05fa8b976208fd5564ace429d90d9f6c93509/src/mongo/db/s/resharding/resharding_txn_cloner.cpp#L103-L105&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;due to the timestamp for stmtId 2 being greater than the fetchTimestamp&lt;/a&gt;. This allows the statements from the retryable write to execute a second time on the recipients after the resharding operation has finished.&lt;/p&gt;

&lt;p/&gt;
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&lt;p/&gt;

&lt;p&gt;The {&quot;lastWriteOpTime.ts&quot;: {$lt: &amp;lt;fetchTimestamp&amp;gt;}} clause is what causes stmtId 2 and therefore the entire retryable write to be skipped over by the recipients.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1628188">SERVER-54626</key>
            <summary>Retryable writes may execute more than once in resharding if statements straddle the fetchTimestamp</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="yuhong.zhang@mongodb.com">Yuhong Zhang</assignee>
                                    <reporter username="max.hirschhorn@mongodb.com">Max Hirschhorn</reporter>
                        <labels>
                            <label>PM-234-M3</label>
                            <label>PM-234-T-config-txn-clone</label>
                    </labels>
                <created>Fri, 19 Feb 2021 03:30:52 +0000</created>
                <updated>Sun, 29 Oct 2023 21:57:20 +0000</updated>
                            <resolved>Wed, 3 Mar 2021 15:01:03 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3644352" author="JIRAUSER1253424" created="Wed, 3 Mar 2021 15:01:03 +0000"  >&lt;p&gt;Option 3 was chosen to address the issue.&lt;/p&gt;</comment>
                            <comment id="3643499" author="xgen-internal-githook" created="Wed, 3 Mar 2021 01:24:13 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Yuhong Zhang&apos;, &apos;email&apos;: &apos;danielzhangyh@gmail.com&apos;, &apos;username&apos;: &apos;YuhongZhang98&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54626&quot; title=&quot;Retryable writes may execute more than once in resharding if statements straddle the fetchTimestamp&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54626&quot;&gt;&lt;del&gt;SERVER-54626&lt;/del&gt;&lt;/a&gt; Retryable writes may execute more than once in resharding if statements straddle the fetchTimestamp&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/82cb2954a0b252f7bc193bf01b5ca105cd637b6e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/82cb2954a0b252f7bc193bf01b5ca105cd637b6e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3626329" author="max.hirschhorn@10gen.com" created="Sat, 20 Feb 2021 01:49:38 +0000"  >&lt;p&gt;I could imagine addressing this issue one of a few different ways:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Change the pipeline to use $graphLookup similar to what is done for resharding&apos;s oplog fetching pipeline to walk the prevOpTime chain to its root. This would have additional complexity of needing another view to avoid exceeding the 100MB memory limit for aggregation pipelines and allowing that view to be queried on across databases.&lt;/li&gt;
	&lt;li&gt;Change SessionTxnRecord to store &lt;a href=&quot;https://github.com/mongodb/mongo/blob/23d05fa8b976208fd5564ace429d90d9f6c93509/src/mongo/db/session_txn_record.idl#L64&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;a startOpTime-like field&lt;/a&gt; for retryable writes which corresponds to the prevOpTime root&apos;s optime. The aggregation pipeline would then use a {&quot;firstWriteOpTime.ts&quot;: {$lt: &amp;lt;fetchTimestamp&amp;gt;}} filter instead.&lt;/li&gt;
	&lt;li&gt;Change recipients to read from the config.transactions collection using {atClusterTime: &amp;lt;fetchTimestamp&amp;gt;} and remove the {&quot;lastWriteOpTime.ts&quot;: {$lt: &amp;lt;fetchTimestamp&amp;gt;}} clause.
	&lt;ul&gt;
		&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/8f0d629e42b2e53505f04680d1285cd06bb32f4b/src/mongo/db/s/resharding/resharding_recipient_service.cpp#L457-L459&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;ReshardingTxnCloners completing before the recipient transitions to kApplying&lt;/a&gt; would become a correctness requirement. This is because donor shards unpin the fetchTimestamp value once all recipients have transitioned to kApplying. Without donor shards pinning their own history, the aggregate command could arbitrarily fail with an operation-fatal SnapshotUnavailable error.&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;I suspect option (3) is likely the most straightforward to implement.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="1629090">SERVER-54681</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1649421">SERVER-55214</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1652773">SERVER-55305</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="1544652">SERVER-52921</issuekey>
        </issuelink>
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