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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-20335] Mongos should not forward a getMore command to the shards with a batchSize of 0</title>
                <link>https://jira.mongodb.org/browse/SERVER-20335</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If the batchSize associated with the initial find command is zero, then the AsyncResultsMerger will send a batchSize of zero to the shards for subsequent getMore commands. Setting a batchSize of zero is illegal for the getMore command and the mongod will return a BadValue error: &quot;Batch size for getMore must be positive, but received: 0&quot;.&lt;/p&gt;

&lt;p&gt;Instead, the getMore commands forwarded to the shards should not have a batchSize. In order to fix, we should not set the value of ClusterClientCursorParams::batchSize to boost::none rather than zero here:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/4a6ff97bd91c340eea7142d13153a495ab3964a3/src/mongo/s/query/cluster_find.cpp#L149&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/4a6ff97bd91c340eea7142d13153a495ab3964a3/src/mongo/s/query/cluster_find.cpp#L149&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="229072">SERVER-20335</key>
            <summary>Mongos should not forward a getMore command to the shards with a batchSize of 0</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="9">Done</resolution>
                                        <assignee username="yunhe.wang">YunHe Wang</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Wed, 9 Sep 2015 22:37:03 +0000</created>
                <updated>Wed, 5 Oct 2016 21:13:20 +0000</updated>
                            <resolved>Thu, 10 Sep 2015 21:40:49 +0000</resolved>
                                                    <fixVersion>3.1.8</fixVersion>
                                    <component>Querying</component>
                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1026825" author="xgen-internal-githook" created="Thu, 10 Sep 2015 21:38:41 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;name&apos;: u&apos;Yunhe (John) Wang&apos;, u&apos;email&apos;: u&apos;yunhe.wang@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20335&quot; title=&quot;Mongos should not forward a getMore command to the shards with a batchSize of 0&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20335&quot;&gt;&lt;del&gt;SERVER-20335&lt;/del&gt;&lt;/a&gt; Mongos now forwards batchSize of none instead of 0&lt;/p&gt;

&lt;p&gt;Closes #1018&lt;/p&gt;

&lt;p&gt;Signed-off-by: David Storch &amp;lt;david.storch@10gen.com&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b3ca1d640e463be14134a2691c066fac18c54fe9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b3ca1d640e463be14134a2691c066fac18c54fe9&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="319227">RUBY-1147</issuekey>
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