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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-72283] Take into account mergeability constraints in` mergeAllChunksOnShard`</title>
                <link>https://jira.mongodb.org/browse/SERVER-72283</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-71612&quot; title=&quot;Implement `mergeAllChunksOnShard` in the sharding catalog manager&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-71612&quot;&gt;&lt;del&gt;SERVER-71612&lt;/del&gt;&lt;/a&gt; introduced a catalog manager method merging in one-shot contiguous sequences of chunks for a given collection for a given shard.&lt;/p&gt;

&lt;p&gt;Purpose of this ticket is to enhance that method in order to take into account the &lt;tt&gt;onCurrentShardSince&lt;/tt&gt; field introduced by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-71615&quot; title=&quot;Add top-level `onCurrentShardSince` field to `config.chunk` entries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-71615&quot;&gt;&lt;del&gt;SERVER-71615&lt;/del&gt;&lt;/a&gt; and the &lt;tt&gt;jumbo&lt;/tt&gt; flag.&lt;/p&gt;

&lt;p&gt;Two or more contiguous &lt;b&gt;non-jumbo&lt;/b&gt; chunks belonging to the same collection are going to be considered &lt;b&gt;mergeable&lt;/b&gt; when they are owned by the same shard and their history can be safely purged without breaking transactions and snapshot reads.&lt;/p&gt;

&lt;p&gt;Technically, this means that each chunk to merge is required to fulfill the following conditions:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Has never been migrated.&lt;br/&gt;
OR&lt;/li&gt;
	&lt;li&gt;The last migration involving it has happened more than &lt;a href=&quot;https://www.mongodb.com/docs/manual/reference/parameters/#mongodb-parameter-param.minSnapshotHistoryWindowInSeconds&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;minSnapshotHistoryWindowInSeconds&lt;/a&gt; ago AND more than &lt;a href=&quot;https://www.mongodb.com/docs/manual/reference/parameters/#mongodb-parameter-param.transactionLifetimeLimitSeconds&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;transactionLifetimeLimitSeconds&lt;/a&gt; (NB: let&apos;s be consistent with &lt;a href=&quot;https://github.com/mongodb/mongo/blob/d2daeef1cef7ec97c17f265bf42762303adf5c4a/src/mongo/db/s/config/sharding_catalog_manager_chunk_operations.cpp#L1099-L1101&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this windowInSeconds&lt;/a&gt;).&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="2216294">SERVER-72283</key>
            <summary>Take into account mergeability constraints in` mergeAllChunksOnShard`</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="13201">Fixed</resolution>
                                        <assignee username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</assignee>
                                    <reporter username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</reporter>
                        <labels>
                    </labels>
                <created>Tue, 20 Dec 2022 19:18:19 +0000</created>
                <updated>Sun, 29 Oct 2023 21:29:02 +0000</updated>
                            <resolved>Wed, 25 Jan 2023 16:14:10 +0000</resolved>
                                                    <fixVersion>6.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5139998" author="xgen-internal-githook" created="Wed, 25 Jan 2023 16:12:20 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Pierlauro Sciarelli&apos;, &apos;email&apos;: &apos;pierlauro.sciarelli@mongodb.com&apos;, &apos;username&apos;: &apos;pierlauro&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-72283&quot; title=&quot;Take into account mergeability constraints in` mergeAllChunksOnShard`&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-72283&quot;&gt;&lt;del&gt;SERVER-72283&lt;/del&gt;&lt;/a&gt; Take into account mergeability constraints in` mergeAllChunksOnShard`&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/798c8f3d8a7ae1e3265deda179b6b5bf0baf330c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/798c8f3d8a7ae1e3265deda179b6b5bf0baf330c&lt;/a&gt;&lt;/p&gt;</comment>
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