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    <title>MongoDB Jira</title>
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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-4094] better mongos handling of state where connections can be established but mongod unresponsive</title>
                <link>https://jira.mongodb.org/browse/SERVER-4094</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It&apos;s possible to get into a hung state in mongos given a sharded cluster with a replica set shard.  If the shard primary continues to allow connections but does not respond to other requests, failover will occur and a new primary will be elected normally, but sharded queries via mongos will block and not return.  &lt;/p&gt;

&lt;p&gt;This failure mode has been observed on EC2.  &lt;/p&gt;

&lt;p&gt;Can reproduce locally by :&lt;br/&gt;
1) Running the script included (sets up a sharded cluster with sharded collection)&lt;br/&gt;
2) Running mongo localhost:31000 to connect to the mongos&lt;br/&gt;
3) &amp;gt; use foo&lt;br/&gt;
4) &amp;gt; db.bar.find().itcount()&lt;br/&gt;
5) Stopping all data transfer for connections at the primary via iptables :&lt;br/&gt;
sudo /sbin/iptables -A INPUT -i lo -p tcp -m tcp --dport &amp;lt;mongod primary port&amp;gt; -m conntrack --ctstate ESTABLISHED -j DROP&lt;br/&gt;
6) (wait for failover)&lt;br/&gt;
7) &amp;gt; db.bar.find().itcount()&lt;/p&gt;

</description>
                <environment></environment>
        <key id="23756">SERVER-4094</key>
            <summary>better mongos handling of state where connections can be established but mongod unresponsive</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="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="greg_10gen">Greg Studer</reporter>
                        <labels>
                    </labels>
                <created>Tue, 18 Oct 2011 15:01:07 +0000</created>
                <updated>Tue, 6 Dec 2022 05:39:56 +0000</updated>
                            <resolved>Fri, 31 May 2019 18:26:40 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>4</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="2267260" author="ratika.gandhi" created="Fri, 31 May 2019 18:26:40 +0000"  >&lt;p&gt;TCP heartbeats should solve the problem of backhole-ing networking&lt;/p&gt;</comment>
                            <comment id="80483" author="milkie" created="Tue, 17 Jan 2012 18:56:57 +0000"  >&lt;p&gt;Upon further discussion, it sounds like it would be better to deliver a SIGHUP signal to the thread blocked in the recv(), and set up a signal handler just for this area of code.&lt;/p&gt;</comment>
                            <comment id="80480" author="milkie" created="Tue, 17 Jan 2012 18:30:52 +0000"  >&lt;p&gt;It looks like it would be okay to close the socket as a way of freeing up the thread blocked on a recv() of the dead socket.  &lt;/p&gt;</comment>
                            <comment id="61133" author="greg_10gen" created="Tue, 18 Oct 2011 15:18:16 +0000"  >&lt;p&gt;Reproduced in master&lt;/p&gt;</comment>
                            <comment id="61132" author="greg_10gen" created="Tue, 18 Oct 2011 15:05:14 +0000"  >&lt;p&gt;To clarify, only tried with 2.0.0, not sure if other versions affected.&lt;/p&gt;</comment>
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            <issuekey id="58487">SERVER-7862</issuekey>
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                            <attachment id="13540" name="hang_setup.js" size="307" author="greg_10gen" created="Tue, 18 Oct 2011 15:01:07 +0000"/>
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