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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-81132] Avoid scanning entire routing table during $merge stage planning</title>
                <link>https://jira.mongodb.org/browse/SERVER-81132</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35905&quot; title=&quot;Plug pieces together to perform a distributed $exchange when applicable&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35905&quot;&gt;&lt;del&gt;SERVER-35905&lt;/del&gt;&lt;/a&gt; we &lt;a href=&quot;https://github.com/mongodb/mongo/blob/669f87e05810e70c9586a5ff46d44aeb550992ad/src/mongo/db/pipeline/sharded_agg_helpers.cpp#L942-L950&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;added a logic to partition a $merge stage&lt;/a&gt; on the shards. &lt;br/&gt;
This logic requires &lt;a href=&quot;https://github.com/mongodb/mongo/blob/669f87e05810e70c9586a5ff46d44aeb550992ad/src/mongo/db/pipeline/sharded_agg_helpers.cpp#L797-L818&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;scanning the entire routing table&lt;/a&gt; for the collection that before 7.0+ could potentially contain millions of entry.&lt;br/&gt;
For collections of large number of chunks, this logic could take seconds to be executed.&lt;br/&gt;
Additionally, this logic is creating a vector of the size of the routing table, potentially consuming several GBs of RAM.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2444451">SERVER-81132</key>
            <summary>Avoid scanning entire routing table during $merge stage planning</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="tommaso.tocci@mongodb.com">Tommaso Tocci</reporter>
                        <labels>
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                <created>Mon, 18 Sep 2023 06:46:14 +0000</created>
                <updated>Mon, 27 Nov 2023 12:50:53 +0000</updated>
                                            <version>4.2.24</version>
                    <version>4.4.24</version>
                    <version>6.0.10</version>
                    <version>5.0.21</version>
                    <version>7.1.0-rc2</version>
                                                                        <votes>0</votes>
                                    <watches>9</watches>
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