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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-66629] Convergence of the migration catch up phase when the user performs batched insertions/deletions</title>
                <link>https://jira.mongodb.org/browse/SERVER-66629</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The goal of this task is to understand how batched insertions/&lt;a href=&quot;https://jira.mongodb.org/browse/PM-2227&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;deletions&lt;/a&gt; on the donor shard affect the migration catch up phase.&lt;/p&gt;

&lt;p&gt;More specifically, recently we got two &lt;a href=&quot;https://buildbaron.corp.mongodb.com/ui/#/bfg/BFG-1172094&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;BFG-1172094&lt;/a&gt;, &lt;a href=&quot;https://buildbaron.corp.mongodb.com/ui/#/bfg/BFG-1172896&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;BFG-1172896 (&lt;/a&gt;part of BF-25179) that showed that under the presence of batched deletions the catch-up phase on the recipient didn&apos;t manage to converge with 37.5s.&lt;/p&gt;

&lt;p&gt;Apart from that, it is interesting to point out that even if the migration is aborted, when we are applying the changes on the recipient we only check whether the migration was aborted between batches. In these two BFGs, there was just one batch but had 100K docs, so it took a lot of time to abort the operation.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2052129">SERVER-66629</key>
            <summary>Convergence of the migration catch up phase when the user performs batched insertions/deletions</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-server-sharding-nyc">[DO NOT USE] Backlog - Sharding NYC</assignee>
                                    <reporter username="sergi.mateo-bellido@mongodb.com">Sergi Mateo Bellido</reporter>
                        <labels>
                            <label>sharding-nyc-subteam2</label>
                    </labels>
                <created>Sat, 21 May 2022 13:55:03 +0000</created>
                <updated>Wed, 1 Feb 2023 16:13:24 +0000</updated>
                            <resolved>Wed, 1 Feb 2023 16:13:24 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5159062" author="JIRAUSER1253399" created="Wed, 1 Feb 2023 16:13:24 +0000"  >&lt;p&gt;Discussed this with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=sergi.mateo-bellido%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;sergi.mateo-bellido@mongodb.com&quot;&gt;sergi.mateo-bellido@mongodb.com&lt;/a&gt;&#160; offline, and with the recent work on parallelizing chunk migrations, this is less likely to happen. Closing this.&lt;/p&gt;</comment>
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