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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-18077] First reads can be routed to the wrong shard if collection is sharded by other mongos</title>
                <link>https://jira.mongodb.org/browse/SERVER-18077</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="196293">SERVER-18077</key>
            <summary>First reads can be routed to the wrong shard if collection is sharded by other 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="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                    </labels>
                <created>Wed, 15 Apr 2015 20:52:32 +0000</created>
                <updated>Thu, 14 Apr 2016 15:19:25 +0000</updated>
                            <resolved>Wed, 23 Sep 2015 19:47:37 +0000</resolved>
                                    <version>3.1.1</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1041255" author="renctan" created="Wed, 23 Sep 2015 19:47:37 +0000"  >&lt;p&gt;Early diagnosis was incorrect, since an exception will be thrown on version mismatch when establishing the version here:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.1.2/src/mongo/client/parallel.cpp#L609&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r3.1.2/src/mongo/client/parallel.cpp#L609&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;This will cause ParallelSortClusteredCursor::startInit to recursively call itself again and re-evaluate the shards that it needs to talk to.&lt;/p&gt;</comment>
                            <comment id="1040922" author="renctan" created="Wed, 23 Sep 2015 15:18:39 +0000"  >&lt;p&gt;Yes.&lt;/p&gt;</comment>
                            <comment id="1040879" author="schwerin" created="Wed, 23 Sep 2015 14:52:19 +0000"  >&lt;p&gt;Are find commands safe from this, as they do not use ParallelSortClusteredCursor?&lt;/p&gt;</comment>
                            <comment id="914486" author="renctan" created="Thu, 14 May 2015 19:30:43 +0000"  >&lt;p&gt;Diagnosis:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.1.1/src/mongo/client/parallel.cpp#L602&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r3.1.1/src/mongo/client/parallel.cpp#L602&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Will set the version correctly on shard connection correctly and will even load a new chunk manager, but ParallelSortClusteredCursor::startInit will go ahead and use the shards decided before the metadata refresh to perform the queries anyway. And since the version in the connection matches, the shard will not complain.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10011">
                    <name>Depends</name>
                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="195969">SERVER-18044</issuekey>
        </issuelink>
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                                <customfieldvalue id="475">Sharding 2 04/24/15</customfieldvalue>
    <customfieldvalue id="500">Sharding 3 05/15/15</customfieldvalue>
    <customfieldvalue id="546">Sharding 4 06/05/15</customfieldvalue>
    <customfieldvalue id="566">Sharding 5 06/26/16</customfieldvalue>
    <customfieldvalue id="576">Sharding 6 07/17/15</customfieldvalue>
    <customfieldvalue id="637">Sharding 9 (09/18/15)</customfieldvalue>
    <customfieldvalue id="685">Sharding A (10/09/15)</customfieldvalue>

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                        <customfieldvalues>
                            <customfieldvalue>&lt;p&gt;Add:&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;
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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;
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			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;just one line above the shardCollection command here:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.1.2/jstests/sharding/read_pref_multi_mongos_stale_config.js#L16&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r3.1.2/jstests/sharding/read_pref_multi_mongos_stale_config.js#L16&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;and run the test.&lt;/p&gt;</customfieldvalue>

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