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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-42016] Add applyOps option to suppress the results array</title>
                <link>https://jira.mongodb.org/browse/SERVER-42016</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In exploring mongomirror performance, we&apos;re looking into why we limit applyOps batches to 1000 entries and whether we can increase that (up to the 16MB document size limit) when applying many small operations. &lt;/p&gt;

&lt;p&gt;One consideration is that the response includes an array of results.  We believe the 1000 op limit may have been chosen historically to avoid having the response in the case of error exceed 16 MB, possibly relating to the size of the &apos;results&apos; array.&lt;/p&gt;

&lt;p&gt;However, mongomirror never looks at the &apos;results&apos; array, only the &apos;ok&apos; field.  Could we consider adding (and backporting) an option for applyOps to suppress the &apos;results&apos; field?  I think that would allow packing many more small ops into a single applyOps command, which should improve throughput.&lt;/p&gt;</description>
                <environment></environment>
        <key id="828445">SERVER-42016</key>
            <summary>Add applyOps option to suppress the results array</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="david.golden@mongodb.com">David Golden</reporter>
                        <labels>
                    </labels>
                <created>Fri, 28 Jun 2019 23:47:41 +0000</created>
                <updated>Tue, 6 Dec 2022 02:55:28 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="2305832" author="david.golden" created="Sat, 29 Jun 2019 23:49:18 +0000"  >&lt;p&gt;Backlog is fine, thanks.&lt;/p&gt;</comment>
                            <comment id="2305828" author="siyuan.zhou@10gen.com" created="Sat, 29 Jun 2019 23:33:55 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=david.golden&quot; class=&quot;user-hover&quot; rel=&quot;david.golden&quot;&gt;david.golden&lt;/a&gt;, thanks for the update. Do you mind us putting this ticket to the backlog since it&apos;s not blocking you? We can revisit this if the &quot;results&quot; array becomes the bottleneck for mongomirror.&lt;/p&gt;</comment>
                            <comment id="2305818" author="david.golden" created="Sat, 29 Jun 2019 21:42:15 +0000"  >&lt;p&gt;Update: I&apos;ve done some spot testing and completed applyOps with up to 100k op entries.  So I don&apos;t think this ticket is blocking us from increasing ops batch sizes, but even still, 10k or 100k true responses in a BSON array does take some space so eliminating it would reduce latency at the margin in receiving the response.&lt;/p&gt;</comment>
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