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    <title>MongoDB Jira</title>
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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-25551] Aggregation batchSize can&apos;t be set on subsequent getMore in the shell</title>
                <link>https://jira.mongodb.org/browse/SERVER-25551</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The wire protocol permits batchSize to be set for getMore&apos;s but there is no way to access this on a cursor returned by the &apos;aggregate&apos; helper.&lt;/p&gt;

&lt;p&gt;The net result is that batchSize can be set only for the initial batch in aggregation, after that it is whatever fits in the 4MB getMore payload (or 16MB when 3.4 comes out, &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21797&quot; title=&quot;Simplify find batching logic&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21797&quot;&gt;&lt;del&gt;SERVER-21797&lt;/del&gt;&lt;/a&gt;).&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://docs.mongodb.com/manual/reference/method/db.collection.aggregate/#example-aggregate-method-initial-batch-size&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;The documentation on the &apos;aggregate&apos; helper method says&lt;/a&gt;:&lt;/p&gt;
&lt;blockquote&gt;&lt;p&gt;Specify subsequent batch sizes to OP_GET_MORE operations as with other MongoDB cursors.&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;Except that isn&apos;t possible either. Even if it were possible to construct an OP_GET_MORE manually in the shell, it requires knowledge of the cursor ID, which is not accessible when using the aggregate helper.&lt;/p&gt;

&lt;p&gt;This ticket is a request to expose a &lt;tt&gt;batchSize&lt;/tt&gt; method on cursors returned by the &lt;tt&gt;collection&lt;/tt&gt; object &lt;tt&gt;aggregate&lt;/tt&gt; helper method.&lt;/p&gt;

&lt;p&gt;Note that some drivers at least already implement this in a much more natural way; C#, for example, implements a batchSize option to the aggregate method that applies for both the initial command and subsequent getMores, completely abstracting the silly shenanigans going on at the wire protocol.&lt;/p&gt;</description>
                <environment></environment>
        <key id="308195">SERVER-25551</key>
            <summary>Aggregation batchSize can&apos;t be set on subsequent getMore in the shell</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="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="9">Done</resolution>
                                        <assignee username="jonathan.reams@mongodb.com">Jonathan Reams</assignee>
                                    <reporter username="andrew.ryder@mongodb.com">Andrew Ryder</reporter>
                        <labels>
                    </labels>
                <created>Thu, 11 Aug 2016 06:17:09 +0000</created>
                <updated>Wed, 14 Feb 2018 19:03:18 +0000</updated>
                            <resolved>Mon, 12 Sep 2016 14:25:41 +0000</resolved>
                                                    <fixVersion>3.3.14</fixVersion>
                                    <component>Shell</component>
                                        <votes>0</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="1381981" author="xgen-internal-githook" created="Mon, 12 Sep 2016 14:25:04 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;jbreams&apos;, u&apos;name&apos;: u&apos;Jonathan Reams&apos;, u&apos;email&apos;: u&apos;jbreams@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25551&quot; title=&quot;Aggregation batchSize can&amp;#39;t be set on subsequent getMore in the shell&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25551&quot;&gt;&lt;del&gt;SERVER-25551&lt;/del&gt;&lt;/a&gt; Pass batchSize through to DBCommandCursor in aggregation helper&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f7de898e68c6b17737c7837ea0df5012d7d4830d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f7de898e68c6b17737c7837ea0df5012d7d4830d&lt;/a&gt;&lt;/p&gt;</comment>
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                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="492524">PHPC-1109</issuekey>
        </issuelink>
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            <issuekey id="242807">SERVER-21797</issuekey>
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