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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>[GODRIVER-1037] Driver appears to send killCursors with a cursorId of 0</title>
                <link>https://jira.mongodb.org/browse/GODRIVER-1037</link>
                <project id="14289" key="GODRIVER">Go Driver</project>
                    <description>&lt;p&gt;Atlas team found the following in application logs, from traffic generated by the automation agent:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2019-05-10T20:39:24.964+0000 I COMMAND  [conn11] command local.clustermanager appName: &quot;MongoDB Automation Agent v10.1.0.5757 (git: 5725b463e240f3602000dd47e3fe652260e8de71)&quot; command: find { find: &quot;clustermanager&quot;, filter: {}, sort: {}, $clusterTime: { clusterTime: Timestamp(1557520763, 1), signature: { hash: BinData(0, 0000000000000000000000000000000000000000), keyId: 0 } }, $db: &quot;local&quot;, $readPreference: { mode: &quot;primaryPreferred&quot; } } planSummary: COLLSCAN keysExamined:0 docsExamined:1 cursorExhausted:1 numYields:0 nreturned:1 reslen:301 locks:{ Global: { acquireCount: { r: 1 } }, Database: { acquireCount: { r: 1 } }, Collection: { acquireCount: { r: 1 } } } protocol:op_msg 0ms&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2019-05-10T20:39:24.965+0000 D COMMAND  [conn11] run command local.$cmd { killCursors: &quot;clustermanager&quot;, cursors: [ 0 ], $clusterTime: { clusterTime: Timestamp(1557520763, 1), signature: { hash: BinData(0, 0000000000000000000000000000000000000000), keyId: 0 } }, $db: &quot;local&quot;, $readPreference: { mode: &quot;primaryPreferred&quot; } }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2019-05-10T20:39:24.966+0000 I COMMAND  [conn11] command local.clustermanager appName: &quot;MongoDB Automation Agent v10.1.0.5757 (git: 5725b463e240f3602000dd47e3fe652260e8de71)&quot; command: killCursors { killCursors: &quot;clustermanager&quot;, cursors: [ 0 ], $clusterTime: { clusterTime: Timestamp(1557520763, 1), signature: { hash: BinData(0, 0000000000000000000000000000000000000000), keyId: 0 } }, $db: &quot;local&quot;, $readPreference: { mode: &quot;primaryPreferred&quot; } } numYields:0 reslen:256 locks:{ Global: { acquireCount: { r: 1 } }, Database: { acquireCount: { r: 1 } }, Collection: { acquireCount: { r: 1 } } } protocol:op_msg 0ms&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;This may indicate a driver bug.  Consider that:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;the &lt;tt&gt;find&lt;/tt&gt; log line indicates &lt;tt&gt;cursorExhausted:1&lt;/tt&gt;, which means the cursorId should come back as 0&lt;/li&gt;
	&lt;li&gt;the &lt;tt&gt;killCursors&lt;/tt&gt; log line indicates &lt;tt&gt;cursors: [ 0 ]&lt;/tt&gt;, which if accurate is incorrect.  A driver should never send a cursorId of 0 to killCursors, as 0 is the sentinel value indicating that there is no cursor.  This is in line with &lt;tt&gt;cursorExhausted&lt;/tt&gt; for the &lt;tt&gt;find&lt;/tt&gt; command just above.&lt;/li&gt;
&lt;/ul&gt;

</description>
                <environment></environment>
        <key id="764744">GODRIVER-1037</key>
            <summary>Driver appears to send killCursors with a cursorId 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="13203">Gone away</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="jeff.yemin@mongodb.com">Jeffrey Yemin</reporter>
                        <labels>
                    </labels>
                <created>Fri, 10 May 2019 21:22:48 +0000</created>
                <updated>Fri, 27 Oct 2023 20:01:25 +0000</updated>
                            <resolved>Wed, 28 Aug 2019 20:33:06 +0000</resolved>
                                                                    <component>CRUD</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2398407" author="alice.thum" created="Wed, 28 Aug 2019 20:31:47 +0000"  >&lt;p&gt;It appears this issue has been fixed at&#160;&lt;a href=&quot;https://github.com/mongodb/mongo-go-driver/blob/master/x/mongo/driver/batch_cursor.go#L217&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-go-driver/blob/master/x/mongo/driver/batch_cursor.go#L217&lt;/a&gt;&#160;where KillCursors checks the bc.id for 0.&lt;/p&gt;</comment>
                            <comment id="2243196" author="jeff.yemin" created="Fri, 10 May 2019 21:28:43 +0000"  >&lt;p&gt;Looking at&#160;&lt;a href=&quot;https://github.com/mongodb/mongo-go-driver/blob/v1.0.1/x/mongo/driver/batch_cursor.go#L203-L207&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-go-driver/blob/v1.0.1/x/mongo/driver/batch_cursor.go#L203-L207&lt;/a&gt;, there doesn&apos;t seem to be a check for &lt;tt&gt;bc.id&lt;/tt&gt; == 0 protecting the call to killCursors.&lt;/p&gt;</comment>
                    </comments>
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