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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-3753] &quot;db config reload failed&quot;</title>
                <link>https://jira.mongodb.org/browse/SERVER-3753</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We got a couple of hundred of these errors today before our application closed the connection to mongos and reconnected:&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;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;Mongo::OperationFailure: db config reload failed!&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;the only thing I can see in the mongos logs at the same time is this:&lt;/p&gt;

&lt;p/&gt;
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					&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;Sat Sep  3 06:12:57 [conn1630] ns: fragments_20110831.exposure_fragments ClusteredCursor::query attempt: 0&lt;/span&gt;&lt;/pre&gt;
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						&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;Sat Sep  3 06:13:01 [conn1630] ns: fragments_20110831.exposure_fragments ClusteredCursor::query attempt: 0&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&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;Sat Sep  3 06:13:12 [conn1630] ns: fragments_20110831.exposure_fragments ClusteredCursor::query attempt: 0&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
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&lt;p/&gt;

&lt;p&gt;which doesn&apos;t look related, but we have approximately 19000 lines of that message in the mongos log, just in the first six hours of today.&lt;/p&gt;</description>
                <environment>Three shards running 1.8.3 on Ubuntu in EC2</environment>
        <key id="21840">SERVER-3753</key>
            <summary>&quot;db config reload failed&quot;</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="greg_10gen">Greg Studer</assignee>
                                    <reporter username="iconara">Theo Hultberg</reporter>
                        <labels>
                    </labels>
                <created>Sat, 3 Sep 2011 06:42:15 +0000</created>
                <updated>Mon, 11 Jul 2016 18:34:35 +0000</updated>
                            <resolved>Tue, 22 Nov 2011 22:21:40 +0000</resolved>
                                    <version>1.8.3</version>
                                    <fixVersion>2.1.0</fixVersion>
                                    <component>Stability</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="52916" author="effata" created="Thu, 8 Sep 2011 05:48:22 +0000"  >&lt;p&gt;We changed our purging implementation to drop databases on the individual shards, and it seems to work better. We kept getting errors about previously dropped databases through mongos. So i ended up cleaning all invalid entries from the config db manually and then dropping those entries on the shards if they were present. That seems to have removed the bugged entries completely, and now databases are reported correctly in mongos. I find it interesting though that when dropping databases on the shard, that information seems to propagate to mongos rather quickly and removing that db from the list in mongos as well.&lt;/p&gt;</comment>
                            <comment id="52914" author="eliot" created="Thu, 8 Sep 2011 05:20:06 +0000"  >&lt;p&gt;Hey - just checking in - any progress?&lt;/p&gt;</comment>
                            <comment id="52385" author="eliot" created="Sat, 3 Sep 2011 14:57:31 +0000"  >&lt;p&gt;No - absolutely not.&lt;br/&gt;
The idea is that mongos would still think it was sharded, just that there wouldn&apos;t be any data in it, which is fine.&lt;br/&gt;
So I wouldn&apos;t update the config servers at all.&lt;/p&gt;</comment>
                            <comment id="52383" author="effata" created="Sat, 3 Sep 2011 14:54:41 +0000"  >&lt;p&gt;Eliot: When dropping databases on each shard manually, i assume we would have to make sure the config data about this was distributed properly to mongos? Removing the collection data from the config database and running flushRouterConfig?&lt;/p&gt;</comment>
                            <comment id="52377" author="eliot" created="Sat, 3 Sep 2011 14:27:30 +0000"  >&lt;p&gt;If you&apos;re going to stay on 1.8.3, this is what I would do:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;never re-use a database&lt;/li&gt;
	&lt;li&gt;once your&apos;e done with it, do not drop via mongos, but do on each shard individually&lt;br/&gt;
That should be stable&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="52376" author="iconara" created="Sat, 3 Sep 2011 14:13:12 +0000"  >&lt;p&gt;Yes, we dropped and probably reused a database (we don&apos;t reuse databases intentionally, but because of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1726&quot; title=&quot;drop/dropDatabase concurrency when sharded&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1726&quot;&gt;&lt;del&gt;SERVER-1726&lt;/del&gt;&lt;/a&gt; we may since mongos says they still exist). If you think this is the reason, this is related to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-3754&quot; title=&quot;Seeing lots of setShardVersion failed&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-3754&quot;&gt;&lt;del&gt;SERVER-3754&lt;/del&gt;&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-3755&quot; title=&quot;mongos died unexpectedly&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-3755&quot;&gt;&lt;del&gt;SERVER-3755&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="52371" author="eliot" created="Sat, 3 Sep 2011 13:26:39 +0000"  >&lt;p&gt;Did you remove and then re-use a database?&lt;br/&gt;
There is definitely an issue with dropping a database in 1.8 that might be causing all your issues that is fixed in 2.0&lt;/p&gt;</comment>
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