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    <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-9630] Mongos crashes by few seconds of DB locking (or network delay).</title>
                <link>https://jira.mongodb.org/browse/SERVER-9630</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I run Mongos on each WEB servers.&lt;br/&gt;
And I set timeout to 1 seconds for each query due to peculiar and general form of the WEB.&lt;/p&gt;

&lt;p&gt;I&apos;m suffering from sudden mongos death.&lt;br/&gt;
It seems like caused by delay of the query from mongos to Mongod.&lt;/p&gt;

&lt;p&gt;Mongos will create a thread per mongos-mongod connections.&lt;br/&gt;
When some queries delayed, Mongos will create new connection and thread to handle the request from APP.&lt;br/&gt;
But these new connection will be delayed while DB locking.&lt;/p&gt;

&lt;p&gt;So Mongos continue to create threads , and die in the end.&lt;/p&gt;

&lt;p&gt;I confirmed that the number of the Mongos&apos;s threads exceed more than 300 when minor network delay (less than 10 seconds).&lt;/p&gt;

&lt;p&gt;I think that the &quot;thread model of Mongos&quot; is unlikely to work well in severe situation.&lt;/p&gt;</description>
                <environment>CentOS release 6.4 (Final) x86_64</environment>
        <key id="74743">SERVER-9630</key>
            <summary>Mongos crashes by few seconds of DB locking (or network delay).</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="crumbjp">Hiroaki</reporter>
                        <labels>
                    </labels>
                <created>Thu, 9 May 2013 03:42:31 +0000</created>
                <updated>Wed, 10 Dec 2014 23:06:25 +0000</updated>
                            <resolved>Mon, 29 Jul 2013 05:29:21 +0000</resolved>
                                    <version>2.0.9</version>
                    <version>2.2.4</version>
                    <version>2.4.3</version>
                                                    <component>Sharding</component>
                    <component>Stability</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="390703" author="stennie" created="Mon, 29 Jul 2013 05:28:56 +0000"  >&lt;p&gt;Hi,&lt;/p&gt;

&lt;p&gt;Thank you for your feedback.  We are working on making a number of improvements to the connection handling between mongos and mongod.  &lt;/p&gt;

&lt;p&gt;For more information and related issues please see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1714&quot; title=&quot;multiplex mongos -&amp;gt; mongod connecions after successful read op&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1714&quot;&gt;&lt;del&gt;SERVER-1714&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Stephen&lt;/p&gt;</comment>
                            <comment id="332478" author="crumbjp" created="Fri, 10 May 2013 01:35:03 +0000"  >&lt;p&gt;Mongos creates per mongos-mongod ACTIVE REQUEST, not per mongos-mongod connections.&lt;/p&gt;</comment>
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