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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>
    </build-info>


<item>
            <title>[SERVER-56786] There are three routing info refreshes and two chunk scans on the mergeChunks path</title>
                <link>https://jira.mongodb.org/browse/SERVER-56786</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The current &lt;tt&gt;mergeChunks&lt;/tt&gt; path is very inefficient because:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;It performs three sequential refreshes (&lt;a href=&quot;https://github.com/mongodb/mongo/blob/c8fe75faf206b6ef78381aa53039d3c0897b01ad/src/mongo/s/commands/cluster_merge_chunks_cmd.cpp#L106&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;router&lt;/a&gt;, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c8fe75faf206b6ef78381aa53039d3c0897b01ad/src/mongo/db/s/merge_chunks_command.cpp#L94&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;shard-pre-merge&lt;/a&gt; and &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c8fe75faf206b6ef78381aa53039d3c0897b01ad/src/mongo/db/s/merge_chunks_command.cpp#L219&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;shard-post-merge&lt;/a&gt;)&lt;/li&gt;
	&lt;li&gt;It performs sequential &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c8fe75faf206b6ef78381aa53039d3c0897b01ad/src/mongo/db/s/merge_chunks_command.cpp#L130&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;scan of the merge bounds&lt;/a&gt; on the cached routing info on the shard, only to generate a config server command with &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c8fe75faf206b6ef78381aa53039d3c0897b01ad/src/mongo/db/s/config/configsvr_merge_chunk_command.cpp#L56&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;size proportional&lt;/a&gt; to the number of chunks being merged (which theoretically can exceed the max BSON size)&lt;/li&gt;
	&lt;li&gt;The config server repeats the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c8fe75faf206b6ef78381aa53039d3c0897b01ad/src/mongo/db/s/config/sharding_catalog_manager_chunk_operations.cpp#L815&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;chunks scan&lt;/a&gt; that the shard did, this time directly against &lt;tt&gt;config.chunks&lt;/tt&gt;, just to check that all the bounds that the shard sent match.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;All this makes the &lt;tt&gt;mergeChunks&lt;/tt&gt; command very expensive both from latency and from impact on the config server points of view.&lt;/p&gt;

&lt;p&gt;It would be much better if:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;The router command:
	&lt;ul&gt;
		&lt;li&gt;Didn&apos;t do a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/65849225a27df5e69999ebbf1f5c8535512eb2b9/src/mongo/s/commands/cluster_merge_chunks_cmd.cpp#L106&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;refresh&lt;/a&gt; on entry, but relied on the cached information and the &lt;tt&gt;shardVersion&lt;/tt&gt; (this has backwards compatibility implications)&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;The shard command (in order of importance):
	&lt;ul&gt;
		&lt;li&gt;Instead of sending all the chunks which fall within a certain range to be merged, just send the ends of the range so that the size of the command to the config server is constant and the scan is done just once&lt;/li&gt;
		&lt;li&gt;Just checked the major &lt;tt&gt;shardVersion&lt;/tt&gt; (for routing correctness, i.e., to make sure this shard owns that range)&lt;/li&gt;
		&lt;li&gt;Only did a refresh on the shard if the chunk bounds that the router sent didn&apos;t match with the cached info (this can only happen if a previous merge committed against the ConfigServer, but failed to refresh)&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="1708201">SERVER-56786</key>
            <summary>There are three routing info refreshes and two chunk scans on the mergeChunks path</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="paolo.polato@mongodb.com">Paolo Polato</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                    </labels>
                <created>Mon, 10 May 2021 08:42:25 +0000</created>
                <updated>Sun, 29 Oct 2023 21:53:50 +0000</updated>
                            <resolved>Wed, 2 Jun 2021 11:00:36 +0000</resolved>
                                    <version>4.0.24</version>
                    <version>4.2.14</version>
                    <version>4.4.6</version>
                                    <fixVersion>4.2.15</fixVersion>
                    <fixVersion>4.4.7</fixVersion>
                    <fixVersion>5.0.0-rc1</fixVersion>
                    <fixVersion>4.0.26</fixVersion>
                    <fixVersion>5.1.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4108174" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 18:59:10 +0000"  >&lt;p&gt;Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it&#8217;s been triggered. For more active release information, please keep an eye on #server-release. Thank you!&lt;/p&gt;</comment>
                            <comment id="3886765" author="xgen-internal-githook" created="Fri, 18 Jun 2021 12:32:10 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56786&quot; title=&quot;There are three routing info refreshes and two chunk scans on the mergeChunks path&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56786&quot;&gt;&lt;del&gt;SERVER-56786&lt;/del&gt;&lt;/a&gt; expand the bounds parameter of mergeChunk in the config server&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 93c36da06fa36454a7f8ff77ce2c86a07ba97e4f)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/15df22d6ba6fd42d4ac869767f7cfb0770cc79d0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/15df22d6ba6fd42d4ac869767f7cfb0770cc79d0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3873435" author="xgen-internal-githook" created="Fri, 11 Jun 2021 15:49:40 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56786&quot; title=&quot;There are three routing info refreshes and two chunk scans on the mergeChunks path&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56786&quot;&gt;&lt;del&gt;SERVER-56786&lt;/del&gt;&lt;/a&gt; expand the bounds parameter of mergeChunk in the config server&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/93c36da06fa36454a7f8ff77ce2c86a07ba97e4f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/93c36da06fa36454a7f8ff77ce2c86a07ba97e4f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3859229" author="xgen-internal-githook" created="Fri, 4 Jun 2021 08:16:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56786&quot; title=&quot;There are three routing info refreshes and two chunk scans on the mergeChunks path&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56786&quot;&gt;&lt;del&gt;SERVER-56786&lt;/del&gt;&lt;/a&gt; expand the bounds parameter of mergeChunk in the config server&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4d58bea897115e86b17c20a808bd392f663c2552&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4d58bea897115e86b17c20a808bd392f663c2552&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3856703" author="xgen-internal-githook" created="Thu, 3 Jun 2021 08:01:36 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56786&quot; title=&quot;There are three routing info refreshes and two chunk scans on the mergeChunks path&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56786&quot;&gt;&lt;del&gt;SERVER-56786&lt;/del&gt;&lt;/a&gt; expand the bounds parameter of mergeChunk in the config server (BACKPORT-9250)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f9d83b669cc832802319005c5b2a5caf2ab18591&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f9d83b669cc832802319005c5b2a5caf2ab18591&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3853318" author="xgen-internal-githook" created="Wed, 2 Jun 2021 11:00:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56786&quot; title=&quot;There are three routing info refreshes and two chunk scans on the mergeChunks path&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56786&quot;&gt;&lt;del&gt;SERVER-56786&lt;/del&gt;&lt;/a&gt; Ensure that the query on config.collections succeeds&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8dc7a2363f71c00f79354ca961197692201a5100&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8dc7a2363f71c00f79354ca961197692201a5100&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3853241" author="xgen-internal-githook" created="Wed, 2 Jun 2021 10:02:20 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56786&quot; title=&quot;There are three routing info refreshes and two chunk scans on the mergeChunks path&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56786&quot;&gt;&lt;del&gt;SERVER-56786&lt;/del&gt;&lt;/a&gt; expand the bounds parameter of mergeChunk in the config server&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/469ba14218e31ce9756888593d88fada001bf6f0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/469ba14218e31ce9756888593d88fada001bf6f0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3794400" author="xgen-internal-githook" created="Thu, 20 May 2021 14:01:35 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56786&quot; title=&quot;There are three routing info refreshes and two chunk scans on the mergeChunks path&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56786&quot;&gt;&lt;del&gt;SERVER-56786&lt;/del&gt;&lt;/a&gt;: defining a separate function to invoke mergeChunks in shard&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/54c1d66aa860dd94ec0508c8ca104bb7b3b1224a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/54c1d66aa860dd94ec0508c8ca104bb7b3b1224a&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1842029">SERVER-59120</issuekey>
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            <issuekey id="1800052">SERVER-58109</issuekey>
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            <issuelink>
            <issuekey id="1707473">SERVER-56779</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1730938">SERVER-57057</issuekey>
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