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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-29369] Unnecessary find of a chunk in _configsvrCommitChunkMigration</title>
                <link>https://jira.mongodb.org/browse/SERVER-29369</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;tt&gt;_configsvrCommitChunkMigration&lt;/tt&gt; command, which is used to persist the new owner of a chunk after a migration performs one &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.4.4/src/mongo/s/catalog/sharding_catalog_manager_chunk_operations_impl.cpp#L146&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;extra lookup&lt;/a&gt; of a chunk in order to verify that the collection epoch has not changed.&lt;/p&gt;

&lt;p&gt;Given that we already find the highest chunk for a collection a little bit &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.4.4/src/mongo/s/catalog/sharding_catalog_manager_chunk_operations_impl.cpp#L663&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;after&lt;/a&gt;, this call is not necessary.&lt;/p&gt;</description>
                <environment></environment>
        <key id="386818">SERVER-29369</key>
            <summary>Unnecessary find of a chunk in _configsvrCommitChunkMigration</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="kaloian.manassiev@mongodb.com">Kaloian Manassiev</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                    </labels>
                <created>Thu, 25 May 2017 06:48:50 +0000</created>
                <updated>Mon, 30 Oct 2023 23:16:31 +0000</updated>
                            <resolved>Wed, 14 Jun 2017 19:19:51 +0000</resolved>
                                    <version>3.4.4</version>
                    <version>3.5.7</version>
                                    <fixVersion>3.5.9</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1597075" author="xgen-internal-githook" created="Wed, 14 Jun 2017 19:16:47 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kaloianm&apos;, u&apos;name&apos;: u&apos;Kaloian Manassiev&apos;, u&apos;email&apos;: u&apos;kaloian.manassiev@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29369&quot; title=&quot;Unnecessary find of a chunk in _configsvrCommitChunkMigration&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29369&quot;&gt;&lt;del&gt;SERVER-29369&lt;/del&gt;&lt;/a&gt; Get rid of one extra find in _configsvrCommitChunkMigration&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ca77c160790082f8efd64a98c586d4fd3f4f64b4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ca77c160790082f8efd64a98c586d4fd3f4f64b4&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1580036" author="kaloian.manassiev" created="Thu, 25 May 2017 15:54:48 +0000"  >&lt;p&gt;Rather, we can perform the check in the later call, when we have found the chunk with the highest version for the purposes of incrementing this value.&lt;/p&gt;</comment>
                            <comment id="1580022" author="schwerin" created="Thu, 25 May 2017 15:45:35 +0000"  >&lt;p&gt;The call is unnecessary because the epoch check effectively happens in the later call?&lt;/p&gt;</comment>
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