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    <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-47972] maxTimeMS set on hedged requests does not give shards enough time to refresh</title>
                <link>https://jira.mongodb.org/browse/SERVER-47972</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Goal: investigate if the scenario outlined below is possible and determine a fix.&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;Scenario:&lt;/p&gt;

&lt;p&gt;Suppose shard0 has a primary, secondary0, and secondary1.&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Each time mongos tries to perform &apos;count&apos; with hedged reads, secondary0 never gets the chance to set the in memory database version because it either gets&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/726c65f4857fdad05075de8277c7d4a7fef92b70/src/mongo/executor/network_interface_tl.cpp#L703&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;killedOp&apos;d&lt;/a&gt;&#160;or timed out of maxTimeMS before it can be set successfully after refreshing.&lt;/li&gt;
	&lt;li&gt;Over the NetworkInterfaceTL, mongos tries to route the next &apos;count&apos; command to secondary0. Secondary0 has no known databaseVersion, so&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/1f0d85a6dc99f1b68ff70d8fd1f87ad16ce5f570/src/mongo/db/service_entry_point_mongod.cpp#L209&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;onDbVersionMismatchNoExcept&lt;/a&gt;&#160;gets called. A refresh is prompted and errors with maxTimeMS expiration error.&lt;/li&gt;
	&lt;li&gt;Since the maxTimeMS error is&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/1f0d85a6dc99f1b68ff70d8fd1f87ad16ce5f570/src/mongo/db/service_entry_point_mongod.cpp#L211&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;ignored&lt;/a&gt;, the original &quot;no known dbVersion&quot; error propagates back to the NetworkInterfaceTL. There, since the error reported is not maxTimeMS, the finish line is triggered. Secondary0 wins the race, but the &apos;count&apos; fails with &quot;don&apos;t know dbVersion.&quot;&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;In this scenario, we believe secondary0 would be getting killed&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/726c65f4857fdad05075de8277c7d4a7fef92b70/src/mongo/s/catalog_cache.cpp#L167&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here.&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1341266">SERVER-47972</key>
            <summary>maxTimeMS set on hedged requests does not give shards enough time to refresh</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="13201">Fixed</resolution>
                                        <assignee username="cheahuychou.mao@mongodb.com">Cheahuychou Mao</assignee>
                                    <reporter username="haley.connelly@mongodb.com">Haley Connelly</reporter>
                        <labels>
                    </labels>
                <created>Tue, 5 May 2020 23:20:07 +0000</created>
                <updated>Sun, 29 Oct 2023 22:08:38 +0000</updated>
                            <resolved>Fri, 15 May 2020 21:56:28 +0000</resolved>
                                                    <fixVersion>4.4.0-rc7</fixVersion>
                    <fixVersion>4.7.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="3090711" author="xgen-internal-githook" created="Fri, 15 May 2020 20:51:33 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Cheahuychou Mao&apos;, &apos;email&apos;: &apos;cheahuychou.mao@mongodb.com&apos;, &apos;username&apos;: &apos;cheahuychou&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47972&quot; title=&quot;maxTimeMS set on hedged requests does not give shards enough time to refresh&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47972&quot;&gt;&lt;del&gt;SERVER-47972&lt;/del&gt;&lt;/a&gt; Increase maxTimeMSForHedgedReads to give shards time to refresh&lt;/p&gt;

&lt;p&gt;(cherry picked from commit e9666e1a6f1494e181c0f064db92734d01206430)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/acde566e9fb14bc0dd16e8a676415f63335d7f47&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/acde566e9fb14bc0dd16e8a676415f63335d7f47&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3090489" author="xgen-internal-githook" created="Fri, 15 May 2020 18:57:58 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Cheahuychou Mao&apos;, &apos;email&apos;: &apos;cheahuychou.mao@mongodb.com&apos;, &apos;username&apos;: &apos;cheahuychou&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47972&quot; title=&quot;maxTimeMS set on hedged requests does not give shards enough time to refresh&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47972&quot;&gt;&lt;del&gt;SERVER-47972&lt;/del&gt;&lt;/a&gt; Increase maxTimeMSForHedgedReads to give shards time to refresh&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e9666e1a6f1494e181c0f064db92734d01206430&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e9666e1a6f1494e181c0f064db92734d01206430&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1150637">SERVER-46187</issuekey>
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