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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-2669] Getting a connection from the pool is returning context.Cancelled instead of DeadlineExceeded</title>
                <link>https://jira.mongodb.org/browse/GODRIVER-2669</link>
                <project id="14289" key="GODRIVER">Go Driver</project>
                    <description>&lt;p&gt;We are seeing the following error in splunk: &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;   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;error incrementing server version counter: timed out &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;while&lt;/span&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; checking out a connection from connection pool: context canceled; maxPoolSize: &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;40&lt;/span&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;, connections in use by cursors: &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;0&lt;/span&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;, connections in use by transactions: &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;0&lt;/span&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;, connections in use by other operations: &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;40&lt;/span&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; (ProtocolErrorCode=&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;201&lt;/span&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;)&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 is for BAAS / App Services / Device Sync. There is a ton of code that we use to interface with the driver and that makes this difficult to provide a whole lot of useful information without just dumping way too much information but the summary is: &lt;br/&gt;
1. I am fairly certain we are not cancelling the context but it could theoretically be possible (I just would expect to see other messages if this were the case) &lt;br/&gt;
2. The context we pass in has a deadline of 4 minutes &lt;br/&gt;
3. This is happening after exactly 30 seconds &lt;/p&gt;


&lt;p&gt;Discussion from slack: &lt;/p&gt;

&lt;p&gt;From Benji: &lt;br/&gt;
That&#8217;s a WaitQueueTimeoutError that is returned during connection check out when the context is done. It wraps the underlying context error. Does the context you&#8217;re using to run operations have any sort of deadline/is there any chance you&#8217;re cancelling it within your application? Can you share the code for &#8220;incrementing server version counter&#8221;?&lt;/p&gt;

&lt;p&gt;From Preston: &lt;br/&gt;
To add to Benji&#8217;s answer, it looks like this is CSOT timeout logic which uses the &#8220;context.CancelFunc&#8221; defined for &#8220;context.WithoutTimeout&#8221;. The code for that in the Go Driver is here.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo-go-driver/blob/master/x/mongo/driver/operation.go#L338&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/operation.go#L338&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;This is not a huge issue for us but it is lightly puzzling. If you need more information please let me know and I apologize I cant provide much more detail now &lt;/p&gt;</description>
                <environment></environment>
        <key id="2199796">GODRIVER-2669</key>
            <summary>Getting a connection from the pool is returning context.Cancelled instead of DeadlineExceeded</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="preston.vasquez@mongodb.com">Preston Vasquez</assignee>
                                    <reporter username="tyler.kaye@mongodb.com">Tyler Kaye</reporter>
                        <labels>
                    </labels>
                <created>Thu, 1 Dec 2022 17:16:21 +0000</created>
                <updated>Fri, 27 Oct 2023 20:01:10 +0000</updated>
                            <resolved>Thu, 9 Mar 2023 13:18:22 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="5261160" author="tyler.kaye" created="Thu, 9 Mar 2023 13:18:07 +0000"  >&lt;p&gt;Hi, I appreciate the effort and thought put into your response. As this is not a big issue on our end, rather just something I wanted to flag and make sure there wasnt a simple issue hiding in the code, I will close this out.&lt;/p&gt;

&lt;p&gt;Thanks, &lt;br/&gt;
Tyler &lt;/p&gt;</comment>
                            <comment id="5261036" author="dbeng-pm-bot" created="Thu, 9 Mar 2023 12:01:01 +0000"  >&lt;p&gt;Hey &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=tyler.kaye%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;tyler.kaye@mongodb.com&quot;&gt;tyler.kaye@mongodb.com&lt;/a&gt;, We need additional details to investigate the problem. If this is still an issue for you, please provide the requested information.&lt;/p&gt;</comment>
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