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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-71710] Investigate if shard merge can ensure eventually consistent fast count with reasonable effort. </title>
                <link>https://jira.mongodb.org/browse/SERVER-71710</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Collection statistics are exposed by &quot;db.stats()&quot; and&#160; &quot;count()&quot; commands. They are stored in 2 different WT tables:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;&lt;b&gt;sizeStorer.wt&lt;/b&gt; contains dataSize, objects (aka numRecords, used by &quot;count()&quot; command)&lt;/li&gt;
	&lt;li&gt;&lt;b&gt;WiredTiger.w&lt;/b&gt;t contains storageSize, freeStorageSize, indexSize, indexFreeStorageSize, etc.&lt;/li&gt;
&lt;/ul&gt;



&lt;p&gt;Both kinds of information are copied from D to R via a temporary WiredTiger instance. The sizeStorer.wt table is synced from in-memory stats every 60 seconds, so the copied info will probably be stale, leading to inaccurate fast count forever.&lt;/p&gt;

&lt;p&gt;PM-2947 will be redesigning the fast count tracking mechanism and ensure eventual fast count consistency. After PM-2947 completion, we will use this ticket to investigate if Merge can ensure eventually consistent fast count with reasonable effort.&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2198860">SERVER-71710</key>
            <summary>Investigate if shard merge can ensure eventually consistent fast count with reasonable effort. </summary>
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                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
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                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-cluster-scalability">Backlog - Cluster Scalability</assignee>
                                    <reporter username="suganthi.mani@mongodb.com">Suganthi Mani</reporter>
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                <created>Wed, 30 Nov 2022 16:56:18 +0000</created>
                <updated>Tue, 12 Dec 2023 15:50:16 +0000</updated>
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