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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-78322] Avoid unnecessarily scanning chunks still not persisted during incremental refresh</title>
                <link>https://jira.mongodb.org/browse/SERVER-78322</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;On a shard, an incremental routing table refresh can start while there are still a lot of chunks that need to be persisted from a previous refresh. When this happens, almost the whole chunks vector is &lt;a href=&quot;https://github.com/mongodb/mongo/blob/7a3da53d603617a6811e104f46086028f49c61d0/src/mongo/db/s/shard_server_catalog_cache_loader.cpp#L1019-L1022&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;unnecessarily scanned&lt;/a&gt; in order to find the new entries.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Example&lt;/b&gt;&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;1M chunks already seen by previous refresh are being persisted&lt;/li&gt;
	&lt;li&gt;Refresh discovers 1 new chunk&lt;/li&gt;
	&lt;li&gt;1M elements will be scanned &lt;a href=&quot;https://github.com/mongodb/mongo/blob/7a3da53d603617a6811e104f46086028f49c61d0/src/mongo/db/s/shard_server_catalog_cache_loader.cpp#L1021&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;&lt;b&gt;Solution&lt;/b&gt;&lt;br/&gt;
Since &lt;tt&gt;collAndChunks.changedChunks&lt;/tt&gt; is a sorted vector, we could simply invert the direction of the loop and scan in decreasing order starting from &lt;tt&gt;collAndChunks.changedChunks.end()&lt;/tt&gt; . If we consider that it is very improbable for a lot of new chunks to be discovered, this will be even more efficient than performing a binary search on the vector.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2374616">SERVER-78322</key>
            <summary>Avoid unnecessarily scanning chunks still not persisted during incremental refresh</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-sharding-emea">[DO NOT USE] Backlog - Sharding EMEA</assignee>
                                    <reporter username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</reporter>
                        <labels>
                    </labels>
                <created>Thu, 22 Jun 2023 13:37:04 +0000</created>
                <updated>Thu, 29 Jun 2023 14:01:52 +0000</updated>
                            <resolved>Thu, 29 Jun 2023 13:58:14 +0000</resolved>
                                    <version>6.0.6</version>
                    <version>4.4.22</version>
                    <version>5.0.18</version>
                    <version>7.0.0-rc5</version>
                                                                        <votes>0</votes>
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