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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-38094] Send prepareTransaction with write concern that waits for majority commit point but not committed snapshot</title>
                <link>https://jira.mongodb.org/browse/SERVER-38094</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As of&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35811&quot; title=&quot;Pin stable timestamp behind the oldest prepareTimestamp&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35811&quot;&gt;&lt;del&gt;SERVER-35811&lt;/del&gt;&lt;/a&gt;, the stable timestamp is not allowed to advance beyond the opTime of the prepare oplog entry of the oldest non-committed/aborted transaction, which means the prepareTransaction command cannot satisfy majority write concern until all earlier prepared transactions have committed or aborted (because majority wc waits for the committed snapshot to advance, which is tied to the stable timestamp). This is a problem for cross-shard transactions because the coordinator shard sends &lt;tt&gt;prepareTransaction&lt;/tt&gt;&#160;to all participant shards with majority write concern and will not make a commit decision until it hears responses from each (or times out and aborts). So if two cross shard transactions involve two of the same shards and their prepare oplog entries are in different orders on those shards, neither coordinator will receive all of the responses it needs to make a decision, and the transactions will deadlock until at least one times out.&lt;/p&gt;

&lt;p&gt;To work around this, each transaction coordinator can send &lt;tt&gt;prepareTransaction&lt;/tt&gt;&#160;with a new write concern that waits for the prepare entry to be majority committed, but not in the committed snapshot, so write concern can be satisfied without waiting for the stable timestamp to advance, but the entry still cannot be rolled back.&lt;/p&gt;</description>
                <environment></environment>
        <key id="632584">SERVER-38094</key>
            <summary>Send prepareTransaction with write concern that waits for majority commit point but not committed snapshot</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:DistributedCommit</label>
                            <label>ShardedTxn:Testing</label>
                    </labels>
                <created>Mon, 12 Nov 2018 18:49:57 +0000</created>
                <updated>Sun, 29 Oct 2023 22:26:37 +0000</updated>
                            <resolved>Thu, 15 Nov 2018 19:54:24 +0000</resolved>
                                                    <fixVersion>4.1.6</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2200484" author="xgen-internal-githook" created="Wed, 3 Apr 2019 14:37:44 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Suganthi Mani&apos;, &apos;username&apos;: &apos;smani87&apos;, &apos;email&apos;: &apos;suganthi.mani@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39041&quot; title=&quot;Remove implementation of internalMajorityNoSnapshot&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39041&quot;&gt;&lt;del&gt;SERVER-39041&lt;/del&gt;&lt;/a&gt; Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38094&quot; title=&quot;Send prepareTransaction with write concern that waits for majority commit point but not committed snapshot&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38094&quot;&gt;&lt;del&gt;SERVER-38094&lt;/del&gt;&lt;/a&gt; Add write concern that waits for majority commit point but not committed snapshot&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 922e2f27c087cc017bb612a5c86eedb2cfa52a75.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/445dcfe70310303713184181919689485a158cd0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/445dcfe70310303713184181919689485a158cd0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2066910" author="xgen-internal-githook" created="Mon, 19 Nov 2018 19:57:03 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jack Mulrow&apos;, &apos;email&apos;: &apos;jack.mulrow@mongodb.com&apos;, &apos;username&apos;: &apos;jsmulrow&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38094&quot; title=&quot;Send prepareTransaction with write concern that waits for majority commit point but not committed snapshot&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38094&quot;&gt;&lt;del&gt;SERVER-38094&lt;/del&gt;&lt;/a&gt; Skip majorityNoSnapshot jstest if storage engine doesn&apos;t support majority read concern&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ac2880e51b9b540a24f9babc632a89c23d0b51b4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ac2880e51b9b540a24f9babc632a89c23d0b51b4&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2063653" author="xgen-internal-githook" created="Thu, 15 Nov 2018 19:51:25 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jack Mulrow&apos;, &apos;email&apos;: &apos;jack.mulrow@mongodb.com&apos;, &apos;username&apos;: &apos;jsmulrow&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38094&quot; title=&quot;Send prepareTransaction with write concern that waits for majority commit point but not committed snapshot&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38094&quot;&gt;&lt;del&gt;SERVER-38094&lt;/del&gt;&lt;/a&gt; Send prepareTransaction with write concern that only waits for majority commit point&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/98c411aac146b85898af737ebe3dac5cf98b5d9e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/98c411aac146b85898af737ebe3dac5cf98b5d9e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2063291" author="xgen-internal-githook" created="Thu, 15 Nov 2018 16:00:57 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jack Mulrow&apos;, &apos;email&apos;: &apos;jack.mulrow@mongodb.com&apos;, &apos;username&apos;: &apos;jsmulrow&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38094&quot; title=&quot;Send prepareTransaction with write concern that waits for majority commit point but not committed snapshot&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38094&quot;&gt;&lt;del&gt;SERVER-38094&lt;/del&gt;&lt;/a&gt; Add write concern that waits for majority commit point but not committed snapshot&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/922e2f27c087cc017bb612a5c86eedb2cfa52a75&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/922e2f27c087cc017bb612a5c86eedb2cfa52a75&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="631270">SERVER-38025</issuekey>
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            <issuekey id="630037">SERVER-37976</issuekey>
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