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    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-31836] Explicit maxTimeMS blocks tailable awaitData cursors on sharded cluster</title>
                <link>https://jira.mongodb.org/browse/SERVER-31836</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, we forward the &lt;tt&gt;maxTimeMS&lt;/tt&gt; for a sharded &lt;tt&gt;$changeStream&lt;/tt&gt; from the &lt;tt&gt;mongoS&lt;/tt&gt; to each of the shards, per &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21218&quot; title=&quot;mongos getMore command implementation does not forward maxTimeMS to the shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21218&quot;&gt;&lt;del&gt;SERVER-21218&lt;/del&gt;&lt;/a&gt;. However, this can cause adverse behaviour if one of the shards is cold, since that shard&apos;s latest optime will not be reported to &lt;tt&gt;mongoS&lt;/tt&gt; until the shard &lt;tt&gt;getMore&lt;/tt&gt; times out, and will therefore block the &lt;tt&gt;mongoS&lt;/tt&gt; from returning results from the other shards. For instance, if we specify a one-minute &lt;tt&gt;maxTimeMS&lt;/tt&gt; on a cluster with one active and one inactive shard, results will accumulate from the active shard but will only be returned to the client at one-minute intervals.&lt;/p&gt;

&lt;p&gt;We should not forward the &lt;tt&gt;maxTimeMS&lt;/tt&gt; from &lt;tt&gt;mongoS&lt;/tt&gt; to the shards. Instead, &lt;tt&gt;mongoS&lt;/tt&gt; should honor the user-defined &lt;tt&gt;maxTimeMS&lt;/tt&gt; but should do so by scheduling a stream of one-second &lt;tt&gt;maxTimeMS&lt;/tt&gt; &lt;tt&gt;getMores&lt;/tt&gt; to each of the shards.&lt;/p&gt;</description>
                <environment></environment>
        <key id="454897">SERVER-31836</key>
            <summary>Explicit maxTimeMS blocks tailable awaitData cursors on sharded cluster</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="bernard.gorman@mongodb.com">Bernard Gorman</assignee>
                                    <reporter username="bernard.gorman@mongodb.com">Bernard Gorman</reporter>
                        <labels>
                    </labels>
                <created>Mon, 6 Nov 2017 11:21:09 +0000</created>
                <updated>Mon, 30 Oct 2023 23:10:46 +0000</updated>
                            <resolved>Sat, 18 Nov 2017 04:02:23 +0000</resolved>
                                                    <fixVersion>3.6.0-rc5</fixVersion>
                    <fixVersion>3.7.1</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="1731384" author="xgen-internal-githook" created="Tue, 21 Nov 2017 10:15:44 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Bernard Gorman&apos;, &apos;username&apos;: &apos;gormanb&apos;, &apos;email&apos;: &apos;bernard.gorman@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31836&quot; title=&quot;Explicit maxTimeMS blocks tailable awaitData cursors on sharded cluster&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31836&quot;&gt;&lt;del&gt;SERVER-31836&lt;/del&gt;&lt;/a&gt; Always dispatch sorted tailable awaitdata getMores to the shards with timeouts of at most 1 second&lt;/p&gt;

&lt;p&gt;(cherry picked from commit ed83e82fcd2731543724523e7fd2c8563ab717c9)&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/aacb5b0d26ed1a660d0b4e736bb0095653b54429&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/aacb5b0d26ed1a660d0b4e736bb0095653b54429&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1729533" author="xgen-internal-githook" created="Sat, 18 Nov 2017 03:59:51 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Bernard Gorman&apos;, &apos;username&apos;: &apos;gormanb&apos;, &apos;email&apos;: &apos;bernard.gorman@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31836&quot; title=&quot;Explicit maxTimeMS blocks tailable awaitData cursors on sharded cluster&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31836&quot;&gt;&lt;del&gt;SERVER-31836&lt;/del&gt;&lt;/a&gt; Always dispatch sorted tailable awaitdata getMores to the shards with timeouts of at most 1 second&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ed83e82fcd2731543724523e7fd2c8563ab717c9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ed83e82fcd2731543724523e7fd2c8563ab717c9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1717606" author="charlie.swanson" created="Mon, 6 Nov 2017 15:29:28 +0000"  >&lt;p&gt;As discussed, I don&apos;t think this really warrants 3.6 Required at this point - so I put this in Needs Triage. It&apos;s definitely important though - so feel free to keep working on it in the meantime - just don&apos;t want to add to the release countdown clock for it.&lt;/p&gt;</comment>
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