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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-26365] mergeChunks fails with empty error message if merging chunks that were moved</title>
                <link>https://jira.mongodb.org/browse/SERVER-26365</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;mergeChunks fails with empty error message if merging chunks that were moved.&lt;/p&gt;

&lt;p&gt;This issue was originally reported in Google Groups: &lt;a href=&quot;https://groups.google.com/forum/#!topic/mongodb-user/cN6Etk06S4g&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://groups.google.com/forum/#!topic/mongodb-user/cN6Etk06S4g&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;The error shown in the &lt;tt&gt;mongo&lt;/tt&gt; shell is:&lt;/p&gt;
&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;   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;{ &quot;ok&quot; : 0, &quot;errmsg&quot; : &quot;&quot; }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;The error shown in the log is:&lt;/p&gt;
&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;   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;BadValue: chunk operation commit failed: version 3|2||57eb2b8706ec6135f8ef76eb doesn&apos;t exist in namespacetest.test. Unable to save chunk ops.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;The cause for the error is that the version mentioned in the logs doesn&apos;t exist in the &lt;tt&gt;chunks&lt;/tt&gt; collection in the &lt;tt&gt;config&lt;/tt&gt; database. It was looking for version (3,2), while the last entry in the &lt;tt&gt;chunks&lt;/tt&gt; collection is version (3,1).&lt;/p&gt;

&lt;p&gt;Jstest to reproduce the issue is attached.&lt;/p&gt;</description>
                <environment></environment>
        <key id="319338">SERVER-26365</key>
            <summary>mergeChunks fails with empty error message if merging chunks that were moved</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="9">Done</resolution>
                                        <assignee username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</assignee>
                                    <reporter username="kevin.adistambha@mongodb.com">Kevin Adistambha</reporter>
                        <labels>
                            <label>code-and-test</label>
                    </labels>
                <created>Wed, 28 Sep 2016 02:36:36 +0000</created>
                <updated>Mon, 21 Nov 2016 14:52:38 +0000</updated>
                            <resolved>Tue, 18 Oct 2016 21:55:02 +0000</resolved>
                                    <version>3.2.9</version>
                                    <fixVersion>3.2.11</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="1424752" author="pi3butcher" created="Thu, 3 Nov 2016 00:48:49 +0000"  >&lt;p&gt;Hello, looks like you all are taking care of the issue. But I just wanted to reaffirm that it still exists atm.&lt;/p&gt;

&lt;p&gt;I am taking M202: MongoDB Advanced Deployment and Operations. A quiz problem had us merge chunks. Instead of simply merging two chunks on the same shard, I moved a chunk, then attempted to merge. It&apos;s failing with: ok: 0 and errmsg: &quot;&quot;&lt;/p&gt;

&lt;p&gt;This is with shell 3.2.1.&lt;/p&gt;
</comment>
                            <comment id="1412447" author="xgen-internal-githook" created="Wed, 19 Oct 2016 13:31:55 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kaloianm&apos;, u&apos;name&apos;: u&apos;Kaloian Manassiev&apos;, u&apos;email&apos;: u&apos;kaloian.manassiev@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26365&quot; title=&quot;mergeChunks fails with empty error message if merging chunks that were moved&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26365&quot;&gt;&lt;del&gt;SERVER-26365&lt;/del&gt;&lt;/a&gt; Forward port changes to merge_chunks_test.js to master&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/59bfd84718bc931f3871a8d53e53edb004434788&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/59bfd84718bc931f3871a8d53e53edb004434788&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1412072" author="xgen-internal-githook" created="Tue, 18 Oct 2016 21:50:48 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kaloianm&apos;, u&apos;name&apos;: u&apos;Kaloian Manassiev&apos;, u&apos;email&apos;: u&apos;kaloian.manassiev@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26365&quot; title=&quot;mergeChunks fails with empty error message if merging chunks that were moved&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26365&quot;&gt;&lt;del&gt;SERVER-26365&lt;/del&gt;&lt;/a&gt; Make mergeChunks use collection version for applyOps precondition&lt;br/&gt;
Branch: v3.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0fc6434e6e37b0eec1074ccb2e4aa4913947e008&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0fc6434e6e37b0eec1074ccb2e4aa4913947e008&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1409001" author="kaloian.manassiev" created="Fri, 14 Oct 2016 18:35:02 +0000"  >&lt;p&gt;Nevermind, I was trying to reproduce it on 3.4.0-rc1. It still reproduces on 3.2.10.&lt;/p&gt;</comment>
                            <comment id="1408975" author="kaloian.manassiev" created="Fri, 14 Oct 2016 18:25:12 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kevin.adistambha&quot; class=&quot;user-hover&quot; rel=&quot;kevin.adistambha&quot;&gt;kevin.adistambha&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;This issue seems to have been fixed in &lt;a href=&quot;https://github.com/mongodb/mongo/commit/08fbb333bc11fba2b9df71a4262da5e18ed00d47&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this commit&lt;/a&gt; as a side effect of fixing &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25602&quot; title=&quot;splitChunk command with out of bound splitKeys fails, but still updates the chunks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25602&quot;&gt;&lt;del&gt;SERVER-25602&lt;/del&gt;&lt;/a&gt; and is available in 3.2.10.&lt;/p&gt;

&lt;p&gt;With a slight change to your attached js test (to merge from [MinKey, 20) instead of from [0, 20), which fall on the same shard) I am getting this more appropriate error code:&lt;/p&gt;
&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;assert: command failed: {&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;        &quot;ok&quot; : 0,&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;        &quot;errmsg&quot; : &quot;could not merge chunks, collection test.test range ending at { a: 20.0 } does not belong to shard shard0000&quot;&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;   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;}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Thank you for reporting it.&lt;/p&gt;

&lt;p&gt;-Kal.&lt;/p&gt;</comment>
                    </comments>
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