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    <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-85729] getMore on exchange does not respect maxTimeMs if the cursor is waiting for different consumer</title>
                <link>https://jira.mongodb.org/browse/SERVER-85729</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In the exchange operator, it&apos;s possible that &lt;a href=&quot;https://github.com/10gen/mongo/blob/ce2797f03f2c8aaec39f99ef09cb4287c9eb1c53/src/mongo/db/pipeline/document_source_exchange.cpp#L343&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;consumer A may fill its buffer&lt;/a&gt;, and &lt;a href=&quot;https://github.com/10gen/mongo/blob/ce2797f03f2c8aaec39f99ef09cb4287c9eb1c53/src/mongo/db/pipeline/document_source_exchange.cpp#L360&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;consumer B is waiting for A to consume its documents&lt;/a&gt; before execution can continue. It seems that the maxTimeMS option is not handled properly when that happens; the cursor will hang indefinitely rather than returning when maxTimeMS is reached.&#160;&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=charlie.swanson%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;charlie.swanson@mongodb.com&quot;&gt;charlie.swanson@mongodb.com&lt;/a&gt; suggested using something like &lt;a href=&quot;https://github.com/10gen/mongo/blob/53291184b9cfe58c26c3a24ce043d4ccf21556fd/src/mongo/util/interruptible.h#L294&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this&lt;/a&gt; to wait on condition variables so the maxTimeMS can be respected, rather than hanging on the mutex as happens now.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2557540">SERVER-85729</key>
            <summary>getMore on exchange does not respect maxTimeMs if the cursor is waiting for different consumer</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="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="will.buerger@mongodb.com">Will Buerger</assignee>
                                    <reporter username="will.buerger@mongodb.com">Will Buerger</reporter>
                        <labels>
                            <label>qi-tech-debt</label>
                    </labels>
                <created>Thu, 25 Jan 2024 19:08:38 +0000</created>
                <updated>Thu, 25 Jan 2024 19:42:22 +0000</updated>
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                            <customfieldvalue>&lt;p&gt;You can reproduce this behavior somewhat consistently with the exchange_producer.js FSM workload, if you reduce the buffer size to ~1000.&lt;/p&gt;</customfieldvalue>

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