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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-57452] Investigate if the sort stage in the retryable write pre-fetch pipeline is necessary</title>
                <link>https://jira.mongodb.org/browse/SERVER-57452</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In tenant migration, we use an aggregation pipeline to pre-fetch retryable writes from the donor. The pipeline includes a&#160;&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/3ebc15ca093bc83bd478914df4259adf4177c833/src/mongo/db/repl/tenant_migration_util.cpp#L326-L341&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;sort stage&lt;/a&gt;, which might not be necessary because when inserting the pre-fetch result into the oplog buffer, it will be sorted. This ticket needs to verify if this stage can be removed.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1769315">SERVER-57452</key>
            <summary>Investigate if the sort stage in the retryable write pre-fetch pipeline is necessary</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="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="wenbin.zhu@mongodb.com">Wenbin Zhu</assignee>
                                    <reporter username="wenbin.zhu@mongodb.com">Wenbin Zhu</reporter>
                        <labels>
                            <label>pm-1791_non-cloud-blocking</label>
                    </labels>
                <created>Fri, 4 Jun 2021 18:21:33 +0000</created>
                <updated>Sun, 29 Oct 2023 21:52:37 +0000</updated>
                            <resolved>Wed, 9 Jun 2021 18:48:03 +0000</resolved>
                                                    <fixVersion>5.0.0-rc2</fixVersion>
                    <fixVersion>5.1.0-rc0</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="4107799" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 18:36:37 +0000"  >&lt;p&gt;Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it&#8217;s been triggered. For more active release information, please keep an eye on #server-release. Thank you!&lt;/p&gt;</comment>
                            <comment id="3869834" author="xgen-internal-githook" created="Wed, 9 Jun 2021 22:00:20 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Wenbin Zhu&apos;, &apos;email&apos;: &apos;wenbin.zhu@mongodb.com&apos;, &apos;username&apos;: &apos;WenbinZhu&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57452&quot; title=&quot;Investigate if the sort stage in the retryable write pre-fetch pipeline is necessary&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57452&quot;&gt;&lt;del&gt;SERVER-57452&lt;/del&gt;&lt;/a&gt; Remove the sort stage in retryable write pre-fetch as oplog buffer now allows unordered insert.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 577a79b14113874d64294a81ba97ca65522f019b)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a946a263a0c4f43b41651fa91c214d75455f307c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a946a263a0c4f43b41651fa91c214d75455f307c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3869347" author="xgen-internal-githook" created="Wed, 9 Jun 2021 18:44:01 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Wenbin Zhu&apos;, &apos;email&apos;: &apos;wenbin.zhu@mongodb.com&apos;, &apos;username&apos;: &apos;WenbinZhu&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57452&quot; title=&quot;Investigate if the sort stage in the retryable write pre-fetch pipeline is necessary&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57452&quot;&gt;&lt;del&gt;SERVER-57452&lt;/del&gt;&lt;/a&gt; Remove the sort stage in retryable write pre-fetch as oplog buffer now allows unordered insert.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/577a79b14113874d64294a81ba97ca65522f019b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/577a79b14113874d64294a81ba97ca65522f019b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3867558" author="JIRAUSER1258790" created="Tue, 8 Jun 2021 21:53:02 +0000"  >&lt;p&gt;The &lt;tt&gt;preload()&lt;/tt&gt; method introduced in&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53509&quot; title=&quot;Create an oplog chain and update config.transactions for retryable writes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53509&quot;&gt;&lt;del&gt;SERVER-53509&lt;/del&gt;&lt;/a&gt;&#160;allows unordered entries to be inserted into oplog buffer collection. And since reading oplog buffer collection &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2c1191cc8ff9ead1c600a85f7a1adbac8e09b1e1/src/mongo/db/repl/oplog_buffer_collection.cpp#L418-L419&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;returns entries in timestamp order&lt;/a&gt;, the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/3ebc15ca093bc83bd478914df4259adf4177c833/src/mongo/db/repl/tenant_migration_util.cpp#L326-L341&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;sort stage&lt;/a&gt; during pre-fetch can be removed.&lt;/p&gt;</comment>
                            <comment id="3862676" author="lingzhi.deng" created="Mon, 7 Jun 2021 15:43:03 +0000"  >&lt;p&gt;We had the sort stage before we added the &lt;tt&gt;preload&lt;/tt&gt; method to the oplog buffer in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53509&quot; title=&quot;Create an oplog chain and update config.transactions for retryable writes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53509&quot;&gt;&lt;del&gt;SERVER-53509&lt;/del&gt;&lt;/a&gt;. Now that the pre-fetched entries are inserted to the oplog buffer using &lt;tt&gt;preload&lt;/tt&gt;, we can probably remove the sort stage.&lt;/p&gt;</comment>
                    </comments>
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