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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-10610] Some collections are dropped spontaniously </title>
                <link>https://jira.mongodb.org/browse/SERVER-10610</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;We are running a MongoDB replica set with 1 Primary and 1 Secondary and 1 Arbiter.&lt;/li&gt;
	&lt;li&gt;We have 2 applications writing to 2 separate db&apos;s in Mongo - lets call these DB1 and DB2 for convenience.&lt;/li&gt;
	&lt;li&gt;DB1 has 6 collections while DB2 has 107 collections.&lt;/li&gt;
	&lt;li&gt;DB1 has been in production for 10 months, DB2 has been in production for 6 months.&lt;/li&gt;
	&lt;li&gt;Today, at around 11:49 a.m. we discovered that 5 collections in DB1 and 90 collections in DB2 were absent from the Primary. Everything was intact in the Secondary.&lt;/li&gt;
	&lt;li&gt;Examining mongodb log, we saw that the number of connections ramped up from ~ 450 at 11:49 a.m. to about 20,000 at 12:11 p.m. after which the mongodb instance started refusing new connections (connection limit reached)
&lt;hr /&gt;
&lt;p&gt;Fri Aug 23 12:11:54 &lt;span class=&quot;error&quot;&gt;&amp;#91;initandlisten&amp;#93;&lt;/span&gt; connection refused because too many open connections: 20000&lt;/p&gt;
&lt;hr /&gt;&lt;/li&gt;
	&lt;li&gt;We restarted mongod and performed a mongodump from the secondary and ran a mongorestore to the primary. After this both the databases DB1 and DB2 started accepting connections and are now working fine.&lt;/li&gt;
	&lt;li&gt;We cannot see any &quot;drop&quot; commands in the mongodb log&lt;/li&gt;
	&lt;li&gt;We can see 2 instances of PageFaultException during this time
&lt;hr /&gt;
&lt;p&gt;Fri Aug 23 11:49:58 &lt;span class=&quot;error&quot;&gt;&amp;#91;conn33572019&amp;#93;&lt;/span&gt; PageFaultException thrown&lt;br/&gt;
Fri Aug 23 11:56:00 &lt;span class=&quot;error&quot;&gt;&amp;#91;conn33572019&amp;#93;&lt;/span&gt; PageFaultException thrown&lt;/p&gt;
&lt;hr /&gt;&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;The questions are: &lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;How did collections in the primary get dropped and were still present in the secondary?&lt;/li&gt;
	&lt;li&gt;Is there any condition under which something like this can happen?&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment>Server:CentOS 6.3 Client: CentOS 6.3, PHP Driver, Java Driver</environment>
        <key id="87153">SERVER-10610</key>
            <summary>Some collections are dropped spontaniously </summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="4">Incomplete</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="rediff">Rediff.com India Ltd</reporter>
                        <labels>
                    </labels>
                <created>Fri, 23 Aug 2013 14:25:46 +0000</created>
                <updated>Wed, 10 Dec 2014 23:18:48 +0000</updated>
                            <resolved>Mon, 28 Oct 2013 03:04:29 +0000</resolved>
                                    <version>2.2.0</version>
                                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="447410" author="stennie" created="Mon, 28 Oct 2013 03:04:29 +0000"  >&lt;p&gt;Hi,&lt;/p&gt;

&lt;p&gt;I&apos;m closing this issue due to inactivity.  We have not had any follow-up to our initial inquiry and would need the requested logs from the primary/secondary in order to investigate further:&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;Do you have logs from the primary and secondary data nodes from a point in time where you know the nodes were in sync through the time of the incident you describe?&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;If you still have the logs available and are able to provide them, please feel free to comment and re-open the issue.  If there is potentially sensitive information in the logs please advise and we can create a private issue to review those.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Stephen&lt;/p&gt;</comment>
                            <comment id="411667" author="dan@10gen.com" created="Mon, 26 Aug 2013 19:04:51 +0000"  >&lt;p&gt;Do you have logs from the primary and secondary data nodes from a point in time where you know the nodes were in sync through the time of the incident you describe?&lt;/p&gt;</comment>
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