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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>[DOCS-13650] Investigate changes in SERVER-47972: maxTimeMS set on hedged requests does not give shards enough time to refresh</title>
                <link>https://jira.mongodb.org/browse/DOCS-13650</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;

    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;p&gt;    We&apos;ve increased the default for maxTimeMSForHedgedReads &lt;a href=&quot;https://github.com/mongodb/mongo/commit/e9666e1a6f1494e181c0f064db92734d01206430#diff-3bbd33af9521cfaf8b85664d4faaaf9cR80&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;
&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&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;


&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
</description>
                <environment></environment>
        <key id="1352936">DOCS-13650</key>
            <summary>Investigate changes in SERVER-47972: maxTimeMS set on hedged requests does not give shards enough time to refresh</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                            <label>docs-sharding</label>
                    </labels>
                <created>Fri, 15 May 2020 20:16:25 +0000</created>
                <updated>Mon, 13 Nov 2023 18:05:08 +0000</updated>
                            <resolved>Mon, 18 May 2020 17:35:00 +0000</resolved>
                                                    <fixVersion>4.4.0-rc7</fixVersion>
                    <fixVersion>4.7.0</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                        <due>Fri, 22 May 2020 00:00:00 +0000</due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3092566" author="xgen-internal-githook" created="Mon, 18 May 2020 15:19:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kay Kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13650&quot; title=&quot;Investigate changes in SERVER-47972: maxTimeMS set on hedged requests does not give shards enough time to refresh&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13650&quot;&gt;&lt;del&gt;DOCS-13650&lt;/del&gt;&lt;/a&gt;: update default for maxTimeMSForHedgedReads&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/4d7c5d737b571a8371581bfe79a0a6b5fc82b02b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/4d7c5d737b571a8371581bfe79a0a6b5fc82b02b&lt;/a&gt;&lt;/p&gt;</comment>
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