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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-16053] explain shell helpers should retry using $explain if explain command fails on a mixed version sharded cluster</title>
                <link>https://jira.mongodb.org/browse/SERVER-16053</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Suppose you have the following configuration:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;version 2.8 mongo shell&lt;/li&gt;
	&lt;li&gt;version 2.8 mongos&lt;/li&gt;
	&lt;li&gt;version 2.6 shards&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Based on the wire version reported by mongos, the shell will notice that the mongos has the explain command available. It will issue explains using the explain command rather than falling back to the $explain query flag.&lt;/p&gt;

&lt;p&gt;However, the explain command on mongos explicitly fails unless all shards are version 2.8. This means that it is impossible to run explain with the above configuration. The shell should retry using legacy $explain in order to support explains in this configuration.&lt;/p&gt;</description>
                <environment></environment>
        <key id="168324">SERVER-16053</key>
            <summary>explain shell helpers should retry using $explain if explain command fails on a mixed version sharded cluster</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Mon, 10 Nov 2014 20:22:07 +0000</created>
                <updated>Mon, 26 Oct 2015 23:57:44 +0000</updated>
                            <resolved>Fri, 14 Nov 2014 17:05:08 +0000</resolved>
                                                    <fixVersion>2.8.0-rc1</fixVersion>
                                    <component>Shell</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="764527" author="xgen-internal-githook" created="Fri, 14 Nov 2014 17:03:57 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16053&quot; title=&quot;explain shell helpers should retry using $explain if explain command fails on a mixed version sharded cluster&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16053&quot;&gt;&lt;del&gt;SERVER-16053&lt;/del&gt;&lt;/a&gt; shell retries using $explain if explain cmd not found on a shard&lt;/p&gt;

&lt;p&gt;Also adds multi-version test for explain.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2de05fd1e465a2889c0f1035709710da8b0ad041&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2de05fd1e465a2889c0f1035709710da8b0ad041&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="764525" author="david.storch" created="Fri, 14 Nov 2014 17:02:21 +0000"  >&lt;p&gt;Drivers implementing explain shell helpers should also implement this retry behavior.&lt;/p&gt;</comment>
                            <comment id="761715" author="david.storch" created="Tue, 11 Nov 2014 21:58:23 +0000"  >&lt;p&gt;This change permits exercising the $explain code path on mongos for a version 2.8 mongos with a 2.8 shell. As such, part of the work for this ticket will be writing multiversion tests which verify correctness of $explain in mixed version sharded configurations.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10320">
                    <name>Documented</name>
                                                                <inwardlinks description="is documented by">
                                        <issuelink>
            <issuekey id="169332">DOCS-4370</issuekey>
        </issuelink>
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                                    </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="84947">SERVER-10448</issuekey>
        </issuelink>
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