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    <title>MongoDB Jira</title>
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    <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-80928] KafkaPartitionConsumer should have a byte limit on prefetching.</title>
                <link>https://jira.mongodb.org/browse/SERVER-80928</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently it uses `maxNumDocsToPrefetch` to decide how many docs to prefetch.&lt;/p&gt;

&lt;p&gt;Instead we should make it prefetch up to 10 batches each of size kDataMsgMaxByteSize. Note that it already emits batches of size kDataMsgMaxByteSize.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2437980">SERVER-80928</key>
            <summary>KafkaPartitionConsumer should have a byte limit on prefetching.</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="kunaal.kumar@mongodb.com">Kunaal Kumar</assignee>
                                    <reporter username="sandeep.dhoot@mongodb.com">Sandeep Dhoot</reporter>
                        <labels>
                            <label>init-337-m3</label>
                    </labels>
                <created>Sat, 9 Sep 2023 00:19:28 +0000</created>
                <updated>Mon, 4 Dec 2023 16:13:06 +0000</updated>
                            <resolved>Mon, 4 Dec 2023 16:13:06 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5876472" author="JIRAUSER1274664" created="Mon, 13 Nov 2023 18:51:50 +0000"  >&lt;p&gt;yeah agreed, we&apos;ll wanna track kafka consumer mem usage, as well as change stream now, since the change stream max buffer size is 200k docs now&lt;/p&gt;</comment>
                            <comment id="5876457" author="JIRAUSER1272673" created="Mon, 13 Nov 2023 18:49:02 +0000"  >&lt;p&gt;Very good question! The answer is most likely yes. But I think we can err on the side of keeping things simple for now and let the stream processor have higher memory usage in this case. We will hopefully have per-tenant feature flags very soon which we can use to temporarily mitigate any production issues that occur because of this.&lt;/p&gt;

&lt;p&gt;But &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=aadesh.patel%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;aadesh.patel@mongodb.com&quot;&gt;aadesh.patel@mongodb.com&lt;/a&gt; this makes me think KafkaConsumer should also report its memory usage to MemoryAggregator. I was previously of the opinion that it does not have to, but probably it does.&lt;/p&gt;</comment>
                            <comment id="5875975" author="JIRAUSER1274664" created="Mon, 13 Nov 2023 16:35:51 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kunaal.kumar%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;kunaal.kumar@mongodb.com&quot;&gt;kunaal.kumar@mongodb.com&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=sandeep.dhoot%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;sandeep.dhoot@mongodb.com&quot;&gt;sandeep.dhoot@mongodb.com&lt;/a&gt; do we want to enforce a global limit across all partitions? in case where we have a topic with 100s of partitions&lt;/p&gt;</comment>
                            <comment id="5871457" author="JIRAUSER1272673" created="Fri, 10 Nov 2023 16:44:30 +0000"  >&lt;p&gt;Thank you!&#160;&lt;/p&gt;</comment>
                            <comment id="5871430" author="JIRAUSER1275228" created="Fri, 10 Nov 2023 16:38:34 +0000"  >&lt;p&gt;Sounds good - I&apos;ll look into that as well.&lt;/p&gt;</comment>
                            <comment id="5871131" author="JIRAUSER1272673" created="Fri, 10 Nov 2023 15:25:56 +0000"  >&lt;p&gt;We want to do this in ChangeStreamOperator as well.&lt;/p&gt;</comment>
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