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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>[CSHARP-1983] Count operation ignored CancellationToken</title>
                <link>https://jira.mongodb.org/browse/CSHARP-1983</link>
                <project id="10041" key="CSHARP">C# Driver</project>
                    <description>&lt;p&gt;I run long Count operation (sync version), that use 10 sec query (in this case its normal).&lt;br/&gt;
We can&apos;t use async version for some reasons. &lt;/p&gt;


&lt;p/&gt;
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					&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;cancellationTokenSource.CancelAfter(&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;1000&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;
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&lt;p/&gt;

&lt;p&gt;But &#1057;ount whatever takes 10 seconds. Why it is not cancelling ? &lt;br/&gt;
Or it check it only before start ?&lt;br/&gt;
I know about MaxTime, but we need to set time limit for many operations and this bug cause use us bad design code.&lt;/p&gt;</description>
                <environment>Server - Ununtu 16.x&lt;br/&gt;
Client - Windows Server 2012</environment>
        <key id="382432">CSHARP-1983</key>
            <summary>Count operation ignored CancellationToken</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="13202">Works as Designed</resolution>
                                        <assignee username="robert@mongodb.com">Robert Stam</assignee>
                                    <reporter username="zoxexivo@gmail.com">Ivan Artemov</reporter>
                        <labels>
                    </labels>
                <created>Wed, 10 May 2017 11:31:14 +0000</created>
                <updated>Fri, 27 Oct 2023 13:25:07 +0000</updated>
                            <resolved>Sun, 29 Oct 2017 21:54:16 +0000</resolved>
                                    <version>2.3</version>
                                                    <component>API</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1572707" author="rstam" created="Tue, 16 May 2017 19:59:20 +0000"  >&lt;p&gt;In general you should try to find a solution that uses MaxTime.&lt;/p&gt;

&lt;p&gt;Abandoning an operation without reading the reply from the server would require closing the socket because that connection would no longer be usable for other operations. However, even closing the socket doesn&apos;t cause the server to cancel the operation. The server will continue to execute the operation, however long that takes, only to find at the end of all that work that it can no longer send the reply because the client closed the socket.&lt;/p&gt;</comment>
                            <comment id="1572698" author="rstam" created="Tue, 16 May 2017 19:55:11 +0000"  >&lt;p&gt;This most likely related to this ticket:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/CSHARP-1200&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/CSHARP-1200&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;The description of that ticket reads:&lt;/p&gt;

&lt;p&gt;All our operations support cancellation via a CancellationToken.&lt;/p&gt;

&lt;p&gt;However, once an operation begins sending or receiving a message over the network we no longer support cancellation until the network I/O completes. It is likely that callers would expect a cancellation request to interrupt the pending network I/O.&lt;/p&gt;

&lt;p&gt;The reason we don&apos;t support cancellation once network I/O has begun is that we don&apos;t want to leave the connection in a damaged state, such as with a half written or half read message. While we don&apos;t yet support pipelining (sharing the same connection among multiple tasks), any future support for pipelining would depend on tasks sharing the connection never leaving the connection in a damaged state.&lt;/p&gt;

&lt;p&gt;So any implementation of this ticket would have to ensure that cancelling an operation is done in a way that doesn&apos;t damage the connection.&lt;/p&gt;</comment>
                    </comments>
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