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    <title>MongoDB Jira</title>
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    <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-2560] Chunk split failed with cannot find split point</title>
                <link>https://jira.mongodb.org/browse/SERVER-2560</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;User reported that this happened on 1.7.5 with 4 shards when trying to manually split the data following the steps outlined in &lt;a href=&quot;http://www.mongodb.org/display/DOCS/Splitting+Chunks&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.mongodb.org/display/DOCS/Splitting+Chunks&lt;/a&gt;. From the google-groups thread (&lt;a href=&quot;http://groups.google.com/group/mongodb-user/browse_thread/thread/eb72f25921d064dd#&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://groups.google.com/group/mongodb-user/browse_thread/thread/eb72f25921d064dd#&lt;/a&gt;)&lt;/p&gt;

&lt;p&gt; &amp;gt; db.runCommand({split: &apos;db_client_14881.raw_data_adt&apos;, find: {_id:&apos;20100601&apos;}}) &lt;br/&gt;
{ &quot;cause&quot; : { }, &quot;ok&quot; : 0, &quot;errmsg&quot; : &quot;split failed&quot; } &lt;br/&gt;
and this error on the mongos log: &lt;br/&gt;
want to split chunk, but can&apos;t find split point chunk ns:db_client_14881.raw_data_adt &lt;br/&gt;
at: shard0002:10.128.0.174:27018 lastmod: 7|1 min: &lt;/p&gt;
{ _id: 
&quot;20100423.091851-17042.2933.hl7&quot; }
&lt;p&gt; max: &lt;/p&gt;
{ _id: &quot;20100610.135539-24674.19100.hl7&quot; }
&lt;p&gt; &lt;br/&gt;
got: &amp;lt;empty&amp;gt; &lt;br/&gt;
This is all that is in the mongod log: &lt;br/&gt;
request split points lookup for chunk db_client_14881.raw_data_adt { : &lt;br/&gt;
&quot;20100423.091851-17042.2933.hl7&quot; } --&amp;gt;&amp;gt; { : &quot;20100610.135539-24674.19100.hl7&quot; } &lt;br/&gt;
Finding the split vector for db_client_14881.raw_data_adt over &lt;/p&gt;
{ _id: 1.0 }
&lt;p&gt; keyCount: &lt;br/&gt;
457579 numSplits: 0 took 132 ms. &lt;br/&gt;
query admin.$cmd ntoreturn:1 command: { splitVector: &quot;db_client_14881.raw_data_adt&quot;, &lt;br/&gt;
keyPattern: &lt;/p&gt;
{ _id: 1.0 }
&lt;p&gt;, min: &lt;/p&gt;
{ _id: &quot;20100423.091851-17042.2933.hl7&quot; }
&lt;p&gt;, max: &lt;/p&gt;
{ _id: 
&quot;20100610.135539-24674.19100.hl7&quot; }
&lt;p&gt;, force: true } reslen:69 132ms &lt;/p&gt;

&lt;p&gt;Using middle instead of find solved the problem. Possible issue with Chunk::pickMedianKey causing the balancer to not find splitPoint&lt;/p&gt;</description>
                <environment></environment>
        <key id="14746">SERVER-2560</key>
            <summary>Chunk split failed with cannot find split point</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="5">Cannot Reproduce</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="sridhar">Sridhar Nanjundeswaran</reporter>
                        <labels>
                    </labels>
                <created>Wed, 16 Feb 2011 00:18:37 +0000</created>
                <updated>Wed, 16 Feb 2011 05:43:15 +0000</updated>
                            <resolved>Wed, 16 Feb 2011 05:43:15 +0000</resolved>
                                    <version>1.7.5</version>
                                                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="23988" author="eliot" created="Wed, 16 Feb 2011 05:43:15 +0000"  >&lt;p&gt;Need more information, following up on mailing list&lt;/p&gt;</comment>
                            <comment id="23981" author="nehresma" created="Wed, 16 Feb 2011 04:25:57 +0000"  >&lt;p&gt;Possibly related to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-2519&quot; title=&quot;If migrate fails due to oversized chunk, try to split that chunk&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-2519&quot;&gt;&lt;del&gt;SERVER-2519&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
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