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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-2813] Temporary MapReduce Collections Won&apos;t Drop</title>
                <link>https://jira.mongodb.org/browse/SERVER-2813</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Attempting to remove empty, temporary Map Reduce collections fails (tried deleting collections in a variety of ways, none of which work):&lt;/p&gt;

&lt;p&gt;   db.runCommand(&lt;/p&gt;
{drop: &apos;tmp.mr.foo_12980807563244151_25433_inc&apos;}
&lt;p&gt;)&lt;/p&gt;
   { &quot;errmsg&quot; : &quot;ns not found&quot;, &quot;ok&quot; : 0 }

&lt;p&gt;Output from command:&lt;/p&gt;

&lt;p&gt;   Mon Mar 21 17:23:49 &lt;span class=&quot;error&quot;&gt;&amp;#91;conn326&amp;#93;&lt;/span&gt; query: test.$cmd&lt;/p&gt;
{ drop: &quot;tmp.mr.foo_12980807563244151_25433_inc&quot; }
&lt;p&gt;   Mon Mar 21 17:23:49 &lt;span class=&quot;error&quot;&gt;&amp;#91;conn326&amp;#93;&lt;/span&gt; run command test.$cmd &lt;/p&gt;
{ drop: &quot;tmp.mr.foo_12980807563244151_25433_inc&quot; }
&lt;p&gt;   Mon Mar 21 17:23:49 &lt;span class=&quot;error&quot;&gt;&amp;#91;conn326&amp;#93;&lt;/span&gt; CMD: drop test.tmp.mr.foo_12980807563244151_25433_inc&lt;br/&gt;
   Mon Mar 21 17:23:49 &lt;span class=&quot;error&quot;&gt;&amp;#91;conn326&amp;#93;&lt;/span&gt; query test.$cmd ntoreturn:1 command: &lt;/p&gt;
{ drop: &quot;tmp.mr.foo_12980807563244151_25433_inc&quot; }
&lt;p&gt; reslen:78 0ms&lt;/p&gt;

&lt;p&gt;I&apos;ve tried dropping these collections through mongos as well as by logging in directly through the masters of each replica set.&lt;/p&gt;</description>
                <environment>Ubuntu 10.04 Server 64-bit, sharding</environment>
        <key id="15207">SERVER-2813</key>
            <summary>Temporary MapReduce Collections Won&apos;t Drop</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="-1">Unassigned</assignee>
                                    <reporter username="kmorales">Kirk Morales</reporter>
                        <labels>
                    </labels>
                <created>Tue, 22 Mar 2011 14:52:49 +0000</created>
                <updated>Tue, 12 Jul 2016 00:18:50 +0000</updated>
                            <resolved>Tue, 29 Mar 2011 17:55:08 +0000</resolved>
                                    <version>1.7.5</version>
                    <version>1.8.0</version>
                                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="27134" author="eliot" created="Tue, 29 Mar 2011 17:55:05 +0000"  >&lt;p&gt;The repair should only be needed after an unclean shutdown.&lt;/p&gt;</comment>
                            <comment id="27133" author="kmorales" created="Tue, 29 Mar 2011 17:35:15 +0000"  >&lt;p&gt;Just ran a repair running v1.8.0 on the same database and the temporary collections are gone!&lt;/p&gt;

&lt;p&gt;Do you recommend running repair somewhat frequently then to take care of this should it happen again? E.g., should we run it once a day to clear out namespace issues and to compact indexes (especially since we&apos;re constantly deleting a lot of data from collections)?&lt;/p&gt;</comment>
                            <comment id="27130" author="eliot" created="Tue, 29 Mar 2011 17:03:07 +0000"  >&lt;p&gt;Did you do a repair after the unclean shutdown?&lt;/p&gt;</comment>
                            <comment id="27129" author="kmorales" created="Tue, 29 Mar 2011 16:59:04 +0000"  >&lt;p&gt;There was an unclean shutdown. We were running 1.7.5 at the time and trying to setup sharding. I /think/ what happened was we were trying to write into the local mongod while reading from a mongos port. We started getting socket errors everywhere.&lt;/p&gt;</comment>
                            <comment id="27127" author="eliot" created="Tue, 29 Mar 2011 16:41:39 +0000"  >&lt;p&gt;Is it possible the database was corrupted?&lt;br/&gt;
Was there an unclean shutdown?&lt;/p&gt;</comment>
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