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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>[JAVA-1882] Driver can exhaust query pool if limit is reached on the first batch of a query</title>
                <link>https://jira.mongodb.org/browse/JAVA-1882</link>
                <project id="10006" key="JAVA">Java Driver</project>
                    <description>&lt;p&gt;When a user specifies a limit on a find operation, and that limit is reached on the initial batch returned from OP_QUERY, the driver immediately attempts to kill the cursor via OP_KILL_CURSOR after reading the initial batch.  The problem is that it does so by pulling another connection from the pool before the connection that was used for the OP_QUERY has been released back to the pool.  This effectively doubles the number of connections required for find operations that specify a limit, and in the worst case can cause starvation, where all threads are waiting for connections but none are available.&lt;/p&gt;</description>
                <environment></environment>
        <key id="215573">JAVA-1882</key>
            <summary>Driver can exhaust query pool if limit is reached on the first batch of a query</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="jeff.yemin@mongodb.com">Jeffrey Yemin</assignee>
                                    <reporter username="jeff.yemin@mongodb.com">Jeffrey Yemin</reporter>
                        <labels>
                    </labels>
                <created>Wed, 8 Jul 2015 14:12:27 +0000</created>
                <updated>Thu, 16 Jul 2015 16:01:13 +0000</updated>
                            <resolved>Fri, 10 Jul 2015 13:10:36 +0000</resolved>
                                    <version>3.0.2</version>
                                    <fixVersion>3.0.3</fixVersion>
                    <fixVersion>3.1.0</fixVersion>
                                    <component>Query Operations</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="967903" author="jeff.yemin" created="Thu, 16 Jul 2015 16:01:13 +0000"  >&lt;p&gt;Fix is now available in the &lt;a href=&quot;https://github.com/mongodb/mongo-java-driver/releases/tag/r3.0.3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;3.0.3 release&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="962115" author="xgen-internal-githook" created="Thu, 9 Jul 2015 14:09:47 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;jyemin&apos;, u&apos;name&apos;: u&apos;Jeff Yemin&apos;, u&apos;email&apos;: u&apos;jeff.yemin@10gen.com&apos;}
&lt;p&gt;Message: When the limit is reached after the initial batch of results of a FindOperation, use the same connection that was used for the initial OP_QUERY to execute the OP_KILL_CURSOR.  This will ensure that a thread never attempts to checkout more than one connection at a time.&lt;/p&gt;

&lt;p&gt; &lt;a href=&quot;https://jira.mongodb.org/browse/JAVA-1882&quot; title=&quot;Driver can exhaust query pool if limit is reached on the first batch of a query&quot; class=&quot;issue-link&quot; data-issue-key=&quot;JAVA-1882&quot;&gt;&lt;del&gt;JAVA-1882&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
Branch: 3.0.x&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-java-driver/commit/34c2e2cffeef54949503ce5cd05594a81af6851a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-java-driver/commit/34c2e2cffeef54949503ce5cd05594a81af6851a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="961371" author="xgen-internal-githook" created="Wed, 8 Jul 2015 18:23:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;jyemin&apos;, u&apos;name&apos;: u&apos;Jeff Yemin&apos;, u&apos;email&apos;: u&apos;jeff.yemin@10gen.com&apos;}
&lt;p&gt;Message: When the limit is reached after the initial batch of results of a FindOperation, use the same connection that was used for the initial OP_QUERY to execute the OP_KILL_CURSOR.  This will ensure that a thread never attempts to checkout more than one connection at a time.&lt;/p&gt;

&lt;p&gt; &lt;a href=&quot;https://jira.mongodb.org/browse/JAVA-1882&quot; title=&quot;Driver can exhaust query pool if limit is reached on the first batch of a query&quot; class=&quot;issue-link&quot; data-issue-key=&quot;JAVA-1882&quot;&gt;&lt;del&gt;JAVA-1882&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-java-driver/commit/eb1d502a8a1042880fafb030aa9c7f639e850a50&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-java-driver/commit/eb1d502a8a1042880fafb030aa9c7f639e850a50&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="960928" author="jeff.yemin" created="Wed, 8 Jul 2015 14:18:53 +0000"  >&lt;p&gt;Thanks to &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=robert.j.moore%40allanbank.com&quot; class=&quot;user-hover&quot; rel=&quot;robert.j.moore@allanbank.com&quot;&gt;robert.j.moore@allanbank.com&lt;/a&gt; for identifying this issue while running the YCSB benchmark.&lt;/p&gt;</comment>
                    </comments>
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                            <issuelinktype id="10012">
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                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="214639">SERVER-19273</issuekey>
        </issuelink>
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