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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-6676] features1.js checkShardingIndex fails with 2.0 mongod 2.2 mongos</title>
                <link>https://jira.mongodb.org/browse/SERVER-6676</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Log from failure is attached.  Prevents the sharding of a collection over particular keys, unclear what patterns trigger this but potentially only when the shard key is not an exact match for the index key.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="46002">SERVER-6676</key>
            <summary>features1.js checkShardingIndex fails with 2.0 mongod 2.2 mongos</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="matulef">Kevin Matulef</assignee>
                                    <reporter username="greg_10gen">Greg Studer</reporter>
                        <labels>
                    </labels>
                <created>Wed, 1 Aug 2012 16:16:40 +0000</created>
                <updated>Thu, 9 Aug 2012 21:46:37 +0000</updated>
                            <resolved>Fri, 3 Aug 2012 21:10:31 +0000</resolved>
                                    <version>2.2.0-rc0</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="150493" author="auto" created="Fri, 3 Aug 2012 21:19:40 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-08-03T14:19:39-07:00&apos;, u&apos;email&apos;: u&apos;matulef@10gen.com&apos;, u&apos;name&apos;: u&apos;Kevin Matulef&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6676&quot; title=&quot;features1.js checkShardingIndex fails with 2.0 mongod 2.2 mongos&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6676&quot;&gt;&lt;del&gt;SERVER-6676&lt;/del&gt;&lt;/a&gt; ignore features1 in multi-version suite&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a267fce485de9d52c73ad3c5637c43602d286a0f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a267fce485de9d52c73ad3c5637c43602d286a0f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="150489" author="matulef" created="Fri, 3 Aug 2012 21:09:28 +0000"  >&lt;p&gt;FYI, if you have a 2.2 mongos talking to a 2.2 mongod, and you take the above steps, sharding the collection will succeed.  However if you also have other shards running 2.0, they won&apos;t be able to receive chunks until they are also upgraded.  The error message you will get if you try to migrate chunks to the 2.0 shards will look like the following:&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;Fri Aug  3 17:03:07 [migrateThread] ERROR: migrate failed: assertion db/dbhelpers.cpp:252&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;Fri Aug  3 17:03:14 [migrateThread]  test.foo Assertion failure ii &amp;gt;= 0 db/dbhelpers.cpp 252&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</comment>
                            <comment id="150483" author="matulef" created="Fri, 3 Aug 2012 20:57:07 +0000"  >&lt;p&gt;Actually, this isn&apos;t really an issue, since the shardCollection command &lt;b&gt;should&lt;/b&gt; fail if try to shard on a prefix shard key but your mongod is still on 2.0.  &lt;/p&gt;

&lt;p&gt;Right now, if you have a 2.2 mongos talking to a 2.0 mongod, and you try to shard a new empty collection, here&apos;s what you get:&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;&amp;gt; db.foo7.ensureIndex( { num : 1 , a : 1 } , true );&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;&amp;gt; db.adminCommand( { shardcollection : &quot;test.foo7&quot; , key : { num : 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;   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;couldn&apos;t find index over splitting key&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;To solve this, you either need to upgrade your mongod, or create an index just on &lt;/p&gt;
{ num : 1 }
&lt;p&gt;.  &lt;/p&gt;</comment>
                            <comment id="150422" author="matulef" created="Fri, 3 Aug 2012 19:05:47 +0000"  >&lt;p&gt;The issue with features1.js is that mongos 2.2 is more permissive about the shard keys it allows (anything that&apos;s a prefix of an existing index. see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1506&quot; title=&quot;when sharding on a and need an index on a,b allow only a,b index&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1506&quot;&gt;&lt;del&gt;SERVER-1506&lt;/del&gt;&lt;/a&gt;) but mongod 2.0 doesn&apos;t know how to utilize such an index unless it&apos;s an exact match for the shard key.  &lt;/p&gt;</comment>
                            <comment id="149589" author="greg_10gen" created="Wed, 1 Aug 2012 19:13:29 +0000"  >&lt;p&gt;index1.js also fails with 2.0/2.2 for I think the same reason, but other changes post-2.0 exclude it from being automatically tested.  &lt;/p&gt;</comment>
                            <comment id="149507" author="greg_10gen" created="Wed, 1 Aug 2012 16:22:15 +0000"  >&lt;p&gt;also note - error output was gathered by manually pushing up the logLevel to 1 on mongod and printing out the command result right before the assert, hence the extra messages.  &lt;/p&gt;</comment>
                            <comment id="149505" author="greg_10gen" created="Wed, 1 Aug 2012 16:19:56 +0000"  >&lt;p&gt;note - features1.js hasn&apos;t been modified significantly since 2.0.&lt;/p&gt;</comment>
                    </comments>
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                            <attachment id="18554" name="multiversion_error.txt" size="36329" author="greg_10gen" created="Wed, 1 Aug 2012 16:16:40 +0000"/>
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