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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-4153] mongodump hung server</title>
                <link>https://jira.mongodb.org/browse/SERVER-4153</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;mongo server was completely unresponsive.  Nothing in logs.  mongodump was in progress at the time.&lt;br/&gt;
Dump file not increasing, iostat showing 0% utilization.  Think this is memory usage related.&lt;br/&gt;
Restart after kill -9 and it came up cleanly.&lt;/p&gt;</description>
                <environment>CentOS 5.6 - EC2 m1.xlarge</environment>
        <key id="24100">SERVER-4153</key>
            <summary>mongodump hung server</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="4">Incomplete</resolution>
                                        <assignee username="brandon">Brandon Diamond</assignee>
                                    <reporter username="cferry@secondmarket.com">Chris Ferry</reporter>
                        <labels>
                    </labels>
                <created>Wed, 26 Oct 2011 15:39:39 +0000</created>
                <updated>Tue, 29 May 2012 14:53:17 +0000</updated>
                            <resolved>Fri, 18 Nov 2011 16:38:42 +0000</resolved>
                                    <version>1.8.3</version>
                                                    <component>Stability</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="65921" author="brandon" created="Thu, 10 Nov 2011 16:02:54 +0000"  >&lt;p&gt;Not sure about any special args; the only goal there is to find out where the process is hanging.&lt;/p&gt;</comment>
                            <comment id="65675" author="cferry@secondmarket.com" created="Wed, 9 Nov 2011 16:47:22 +0000"  >&lt;p&gt;Do you have the gdb arguments you want me to use when attaching?&lt;br/&gt;
Looking for logs now&lt;/p&gt;</comment>
                            <comment id="64028" author="brandon" created="Tue, 1 Nov 2011 19:05:53 +0000"  >&lt;p&gt;Thanks for the clarification, Chris.&lt;/p&gt;

&lt;p&gt;MongoDB maps all data into virtual memory; as long RSS doesn&apos;t grow larger than physical memory, you shouldn&apos;t encounter any issues. Do you happen to have the mongod log files available from the time the issue was observed? If the problem occurs again, it&apos;d also be extremely helpful if you could attach GDB to the process and see where the process is waiting (&quot;where&quot;).&lt;/p&gt;

&lt;p&gt;I also noticed that you&apos;re running on 1.8.3 &amp;#8211; you should consider upgrading to the latest minor revision (1.8.4) for the latest patches and bugfixes.&lt;/p&gt;</comment>
                            <comment id="64001" author="cferry@secondmarket.com" created="Tue, 1 Nov 2011 17:00:46 +0000"  >&lt;p&gt;Server that had the issue.&lt;/p&gt;</comment>
                            <comment id="64000" author="cferry@secondmarket.com" created="Tue, 1 Nov 2011 16:58:54 +0000"  >&lt;p&gt;Primary MongoDB metrics for last day and last week.&lt;/p&gt;</comment>
                            <comment id="63998" author="cferry@secondmarket.com" created="Tue, 1 Nov 2011 16:56:11 +0000"  >&lt;p&gt;Sorry I was on vacation.&lt;br/&gt;
What I&apos;m noticing is a high level of VSS memusage.&lt;br/&gt;
example our prod primary:&lt;br/&gt;
14511 mongod    15   0 58.6g 8.8g 8.1g S  1.0 58.5 368:29.57 mongod                                                                                                                             &lt;br/&gt;
prod secondaries:&lt;br/&gt;
 9673 mongod    15   0 57.5g  10g  10g S  0.0 69.2   4:44.79 mongod                                                                                                                             &lt;br/&gt;
11544 mongod    15   0 57.7g  12g  12g R  0.0 85.4  16:31.43 mongod                                                                                                                             &lt;/p&gt;

&lt;p&gt;By unresponsive I mean all queries were timing out and the CLI was not connecting.  Finally I tried a kill which failed to work until I kill nined it.&lt;/p&gt;

&lt;p&gt;We haven&apos;t had any lockups since, but I&apos;m wondering what we can do to assist in troubleshooting if we were to have another.&lt;/p&gt;</comment>
                            <comment id="63995" author="brandon" created="Tue, 1 Nov 2011 16:48:17 +0000"  >&lt;p&gt;Haven&apos;t heard anything for awhile. Has anything changed? Otherwise, we&apos;ll close out this ticket tonight.&lt;/p&gt;</comment>
                            <comment id="63390" author="brandon" created="Fri, 28 Oct 2011 19:07:21 +0000"  >&lt;p&gt;One more thing &amp;#8211; can you explain what you mean by &quot;unresponsive&quot;? Can you connect to the server with a separate mongoDB client?&lt;/p&gt;</comment>
                            <comment id="63369" author="brandon" created="Fri, 28 Oct 2011 17:16:42 +0000"  >&lt;p&gt;Thanks for all the info, Chris.&lt;/p&gt;

&lt;p&gt;What does your memory utilization look like over time? In other words, are you running the dump on a busy system with very little available memory? Or is the dump consuming most of the available memory on the system? This definitely looks like a lomem related issue.&lt;/p&gt;

&lt;p&gt;Any chance you could hook GDB into the process and find out where the tool is stalling? I&apos;m having trouble reproducing on my end.&lt;/p&gt;</comment>
                    </comments>
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                            <attachment id="13682" name="Screen Shot 2011-11-01 at 12.57.13 PM.png" size="332663" author="cferry@secondmarket.com" created="Tue, 1 Nov 2011 16:58:54 +0000"/>
                            <attachment id="13684" name="Screen Shot 2011-11-01 at 12.57.47 PM.png" size="314084" author="cferry@secondmarket.com" created="Tue, 1 Nov 2011 17:00:46 +0000"/>
                            <attachment id="13683" name="Screen Shot 2011-11-01 at 12.57.47 PM.png" size="314084" author="cferry@secondmarket.com" created="Tue, 1 Nov 2011 16:58:54 +0000"/>
                            <attachment id="13611" name="mdb1-102611.txt" size="54404" author="cferry@secondmarket.com" created="Wed, 26 Oct 2011 15:39:39 +0000"/>
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