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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-13806] Need better detection and reporting of the existence of jumbo chunks</title>
                <link>https://jira.mongodb.org/browse/SERVER-13806</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As far as I can see, a jumbo chunk is only marked as such when the balancer has attempted to migrate it to another shard (Chunk::markAsJumbo is only called from Balancer::_moveChunks).&lt;/p&gt;

&lt;p&gt;This means that there&apos;s no indication of jumbo chunks unless:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;chunk imbalance has grown past the threshold at which the balancer tries to move chunks, and&lt;/li&gt;
	&lt;li&gt;the balancer has attempted to move a jumbo chunk to redress the imbalance&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;It would be good to have more comprehensive and early warning of jumbo chunks.  This checking could perhaps be added to the splitVector handling in mongod.&lt;/p&gt;</description>
                <environment></environment>
        <key id="134394">SERVER-13806</key>
            <summary>Need better detection and reporting of the existence of jumbo chunks</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="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">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="jon.rangel@mongodb.com">Jon Rangel</reporter>
                        <labels>
                    </labels>
                <created>Thu, 1 May 2014 15:56:45 +0000</created>
                <updated>Tue, 6 Dec 2022 05:06:36 +0000</updated>
                            <resolved>Thu, 3 Jan 2019 16:01:53 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>1</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="2104345" author="kaloian.manassiev" created="Thu, 3 Jan 2019 16:01:53 +0000"  >&lt;p&gt;Discovering jumbo-chunks proactively would require periodically scanning all the data in the collection, which is very resource intensive.&lt;/p&gt;

&lt;p&gt;With the auto-splitter running on the shards now in 4.2, any jumbo chunks taking writes will be proactively marked as jumbo as well, so it is not just the balancer.&lt;/p&gt;</comment>
                            <comment id="653295" author="greg_10gen" created="Wed, 9 Jul 2014 16:59:53 +0000"  >&lt;p&gt;Not sure if the &quot;jumbo&quot; field should be used in this kind of debugging, it&apos;s really a balancer state and not a statistic.  Too-large chunks are pretty verbose when they can&apos;t be split - but agree we need to make this info more visible (and probably improve the messages).&lt;/p&gt;

&lt;p&gt;This might also be further addressed by some planned changes to send more metadata operation messages to the config servers.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
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                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="972396">SERVER-44088</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="117363">SERVER-13024</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="244329">SERVER-21931</issuekey>
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                            <customfieldvalue>&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;sh.enableSharding(&quot;test&quot;);&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;sh.shardCollection(&quot;test.foo&quot;,{a:1});&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;sh.splitAt(&quot;test.foo&quot;,{a:1000});&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;for (var i=0; i&amp;lt;10000000; i++) {db.getSiblingDB(&quot;test&quot;).foo.insert({a:1, padding:&quot;xxxxxxxx...xxxxx&quot;})}&lt;/span&gt;&lt;/pre&gt;
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&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Run the above commands and observe that chunk MinKey -&amp;gt; 1000 is not marked as jumbo in the chunk meta data, even after it has grown past the max chunk size for the cluster.&lt;/p&gt;</customfieldvalue>

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