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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-44110] Change stream aggregation fails with &quot;operation exceeded time limit&quot; if maxTimeMS is specified</title>
                <link>https://jira.mongodb.org/browse/SERVER-44110</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;For  &lt;tt&gt;$changeStream&lt;/tt&gt;, if the initial &lt;tt&gt;aggregate&lt;/tt&gt; command specifies an explicit &lt;tt&gt;maxTimeMS&lt;/tt&gt; &lt;b&gt;and&lt;/b&gt; the work of constructing the first batch takes longer than &lt;tt&gt;maxTimeMS&lt;/tt&gt;, the command will fail with &lt;tt&gt;ErrorCodes::MaxTimeMSExpired&lt;/tt&gt; despite the fact that this is a &lt;tt&gt;tailable&lt;/tt&gt; &lt;tt&gt;awaitData&lt;/tt&gt; cursor.&lt;/p&gt;

&lt;p&gt;Full log line of one such command failing:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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;2019-10-18T05:29:42.763+0000 I &#160;COMMAND &#160;[conn1316] command local.oplog.rs command: aggregate { aggregate: &quot;fts&quot;, cursor: {}, maxTimeMS: 1000, pipeline: [ { $changeStream: { startAfter: { _data: &quot;825DA9470E000000012B0229296E04&quot; }, fullDocument: &quot;updateLookup&quot; } } ], $db: &quot;test&quot;, $clusterTime: { clusterTime: Timestamp(1571376579, 1), signature: { hash: BinData(0, 00F7C4A3426B593FA553F668DD7DBA4E1C0B6F33), keyId: 6745581691277934593 } }, lsid: { id: UUID(&quot;3655f6dd-aabb-49e7-b582-b1459d4c879b&quot;) }, $readPreference: { mode: &quot;primaryPreferred&quot; } } planSummary: COLLSCAN numYields:58 ok:0 errMsg:&quot;Error in $cursor stage :: caused by :: operation exceeded time limit&quot; errName:MaxTimeMSExpired errCode:50 reslen:285 locks:{ ReplicationStateTransition: { acquireCount: { w: 61 } }, Global: { acquireCount: { r: 61 } }, Database: { acquireCount: { r: 60 } }, Collection: { acquireCount: { r: 1 } }, Mutex: { acquireCount: { r: 3 } }, oplog: { acquireCount: { r: 59 } } } protocol:op_msg 1103ms&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="973212">SERVER-44110</key>
            <summary>Change stream aggregation fails with &quot;operation exceeded time limit&quot; if maxTimeMS is specified</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="13202">Works as Designed</resolution>
                                        <assignee username="bernard.gorman@mongodb.com">Bernard Gorman</assignee>
                                    <reporter username="kevin.rosendahl@mongodb.com">Kevin Rosendahl</reporter>
                        <labels>
                    </labels>
                <created>Fri, 18 Oct 2019 18:51:20 +0000</created>
                <updated>Fri, 27 Oct 2023 13:53:02 +0000</updated>
                            <resolved>Sat, 7 Dec 2019 01:11:12 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2591113" author="bernard.gorman" created="Sat, 7 Dec 2019 01:02:30 +0000"  >&lt;p&gt;Spoke with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=charlie.swanson&quot; class=&quot;user-hover&quot; rel=&quot;charlie.swanson&quot;&gt;charlie.swanson&lt;/a&gt; about this today. We agreed that this is intended behaviour, since the initial &lt;tt&gt;aggregate&lt;/tt&gt; is doing the work necessary &lt;b&gt;in order to establish&lt;/b&gt; the &lt;tt&gt;tailable awaitData&lt;/tt&gt; cursor, and that if the user wishes to ensure a fast return then they should explicitly specify &lt;tt&gt;batchSize:0&lt;/tt&gt; when running the command. They can then move through the oplog incrementally using &lt;tt&gt;getMore&lt;/tt&gt; with &lt;tt&gt;maxTimeMs&lt;/tt&gt;.&lt;/p&gt;</comment>
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                            <customfieldvalue>&lt;p&gt;Specify a&#160;&lt;tt&gt;maxTimeMS&lt;/tt&gt; with the &lt;tt&gt;aggregate&lt;/tt&gt; command with a&#160;&lt;tt&gt;$changeStream&lt;/tt&gt; pipeline shorter than the amount of time it will take to scan the oplog.&lt;/p&gt;

&lt;p&gt;I produced this by opening 300 concurrent change streams with &lt;tt&gt;startAfter&lt;/tt&gt; pointing to an entry earlier in the oplog and a &lt;tt&gt;maxTimeMS&lt;/tt&gt; of 1000 on a 4 core machine.&lt;/p&gt;</customfieldvalue>

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