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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
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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-41165] Transaction participants don&apos;t need to do a noop write before committing a read-only transaction</title>
                <link>https://jira.mongodb.org/browse/SERVER-41165</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, TransactionParticipant::commitUnpreparedTransaction &lt;a href=&quot;https://github.com/mongodb/mongo/blob/496e7b3439df32730aa9c41f23f730fea2ca0464/src/mongo/db/transaction_participant.cpp#L1232-L1235&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;does a noop write&lt;/a&gt; after committing a read-only transaction, so that waiting for writeConcern waits for a Timestamp after the transaction&apos;s read Timestamp, to respect the isolation level requested by the client&apos;s writeConcern.&lt;/p&gt;

&lt;p&gt;Instead, it can just wait for writeConcern of the read Timestamp.&lt;/p&gt;</description>
                <environment></environment>
        <key id="769446">SERVER-41165</key>
            <summary>Transaction participants don&apos;t need to do a noop write before committing a read-only transaction</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="esha.maharishi@mongodb.com">Esha Maharishi</reporter>
                        <labels>
                            <label>ShardedTxn:FutureOptimizations</label>
                    </labels>
                <created>Wed, 15 May 2019 22:14:00 +0000</created>
                <updated>Tue, 6 Dec 2022 02:59:32 +0000</updated>
                                                                            <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="2262486" author="esha.maharishi@10gen.com" created="Tue, 28 May 2019 19:35:07 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=judah.schvimer&quot; class=&quot;user-hover&quot; rel=&quot;judah.schvimer&quot;&gt;judah.schvimer&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=tess.avitabile&quot; class=&quot;user-hover&quot; rel=&quot;tess.avitabile&quot;&gt;tess.avitabile&lt;/a&gt;, this optimization is independent of any sharding machinery and can also apply to single replica set transactions.&lt;/p&gt;

&lt;p&gt;It was not a high priority in PM-564, but I think that&apos;s mainly because we were blocked on it.&lt;/p&gt;

&lt;p&gt;We passed it to repl since the repl team seemed to be solving related problems and had more context on when and how (and if) this optimization should be done.&lt;/p&gt;</comment>
                            <comment id="2262400" author="tess.avitabile" created="Tue, 28 May 2019 18:51:55 +0000"  >&lt;p&gt;Since this optimization is only for transactions with snapshot readConcern, I don&apos;t think it is that valuable. We plan to schedule&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39364&quot; title=&quot;Audit uses of setLastOpToSystemLastOpTime&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39364&quot;&gt;&lt;del&gt;SERVER-39364&lt;/del&gt;&lt;/a&gt; early in 4.4, which will hopefully allow us to get rid of the noop write in all cases.&lt;/p&gt;</comment>
                            <comment id="2262392" author="judah.schvimer" created="Tue, 28 May 2019 18:49:17 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=esha.maharishi&quot; class=&quot;user-hover&quot; rel=&quot;esha.maharishi&quot;&gt;esha.maharishi&lt;/a&gt;, do you have any extra information on how this optimization was prioritized in PM-564 so we can triage it effectively?&lt;/p&gt;

&lt;p&gt;Also, is there any coordinator work necessary to make this work?&lt;/p&gt;</comment>
                            <comment id="2254014" author="tess.avitabile" created="Tue, 21 May 2019 13:43:41 +0000"  >&lt;p&gt;Note that this optimization only applies to transactions with read concern snapshot, since local/majority transactions do not have a read timestamp. Local/majority transactions will still need to use a noop write until we have a general solution for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39364&quot; title=&quot;Audit uses of setLastOpToSystemLastOpTime&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39364&quot;&gt;&lt;del&gt;SERVER-39364&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
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