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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-16237] Don&apos;t check the shard version if the primary server is down</title>
                <link>https://jira.mongodb.org/browse/SERVER-16237</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/client/parallel.cpp#L555&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;source code&lt;/a&gt; we have a check to bypass the shard version check when the primary connection is in the bad state. However, it appears to be incomplete. &lt;/p&gt;

&lt;p&gt;The state of the connection will not be recognized as bad until the OS figures it out (e.g. with keepalive), or until we try to use it. Hence it&apos;s possible to encounter a scenario when primary is unreachable, but the connection is still recognized as valid, so we will try to check the shard version, which triggers the replicasetrefresh, and we will encounter the 5 sec timeout there on each and every query. Plus we can also get delayed by other threads who are doing the refresh, as it&apos;s a serialized action.&lt;/p&gt;

&lt;p&gt;If we already know that the primary server is down (i.e. the monitor knows), we probably can avoid checking the shard version if possible.&lt;/p&gt;</description>
                <environment></environment>
        <key id="170177">SERVER-16237</key>
            <summary>Don&apos;t check the shard version if the primary server is down</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="9">Done</resolution>
                                        <assignee username="spencer@mongodb.com">Spencer Brody</assignee>
                                    <reporter username="alex.komyagin@mongodb.com">Alexander Komyagin</reporter>
                        <labels>
                    </labels>
                <created>Wed, 19 Nov 2014 17:22:34 +0000</created>
                <updated>Fri, 19 Jun 2015 17:28:25 +0000</updated>
                            <resolved>Mon, 22 Dec 2014 23:27:42 +0000</resolved>
                                    <version>2.7.8</version>
                                    <fixVersion>2.6.7</fixVersion>
                    <fixVersion>2.8.0-rc4</fixVersion>
                                    <component>Sharding</component>
                    <component>Stability</component>
                                        <votes>0</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="798567" author="xgen-internal-githook" created="Tue, 6 Jan 2015 23:02:42 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;stbrody&apos;, u&apos;name&apos;: u&apos;Spencer T Brody&apos;, u&apos;email&apos;: u&apos;spencer@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16237&quot; title=&quot;Don&amp;#39;t check the shard version if the primary server is down&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16237&quot;&gt;&lt;del&gt;SERVER-16237&lt;/del&gt;&lt;/a&gt; Don&apos;t check shard version if the replica set monitor knows the primary is down&lt;br/&gt;
Branch: v2.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/357cf5e9029db85ce36cd6c7ef181edcc142f493&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/357cf5e9029db85ce36cd6c7ef181edcc142f493&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="792754" author="alex.komyagin@10gen.com" created="Tue, 23 Dec 2014 00:45:08 +0000"  >&lt;p&gt;Results of testing Spencer&apos;s fix:&lt;/p&gt;
&lt;p/&gt;
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					&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;git version: b0459b8ef0d506501cc0a9ae062cd788f77c02ce&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;It appears to have done the trick:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;an &lt;em&gt;existing&lt;/em&gt; connection that reads with primaryPreferred, after blocking the primary and sleeping 30 sec, was able to read &lt;em&gt;without&lt;/em&gt; any delays&lt;/li&gt;
	&lt;li&gt;a &lt;em&gt;new&lt;/em&gt; connection that reads with primaryPreferred, after blocking the primary and sleeping 30 sec, was able to read &lt;em&gt;without&lt;/em&gt; any delays&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="792696" author="xgen-internal-githook" created="Mon, 22 Dec 2014 23:27:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;stbrody&apos;, u&apos;name&apos;: u&apos;Spencer T Brody&apos;, u&apos;email&apos;: u&apos;spencer@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16237&quot; title=&quot;Don&amp;#39;t check the shard version if the primary server is down&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16237&quot;&gt;&lt;del&gt;SERVER-16237&lt;/del&gt;&lt;/a&gt; Don&apos;t check shard version if the replica set monitor knows the primary is down&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0ba73576bbe465097c825ba946f561c267465a88&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0ba73576bbe465097c825ba946f561c267465a88&lt;/a&gt;&lt;/p&gt;</comment>
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