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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-34187] FailPoint to hang up on client in abortTransaction/commitTransaction</title>
                <link>https://jira.mongodb.org/browse/SERVER-34187</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Drivers will need a way to test that they retry abortTransaction or commitTransaction once, according to the spec, if we get a network error on the first attempt.&lt;/p&gt;

&lt;p&gt;cc &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=shane.harvey&quot; class=&quot;user-hover&quot; rel=&quot;shane.harvey&quot;&gt;shane.harvey&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jeff.yemin&quot; class=&quot;user-hover&quot; rel=&quot;jeff.yemin&quot;&gt;jeff.yemin&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="518710">SERVER-34187</key>
            <summary>FailPoint to hang up on client in abortTransaction/commitTransaction</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="3">Duplicate</resolution>
                                        <assignee username="spencer@mongodb.com">Spencer Brody</assignee>
                                    <reporter username="jesse@mongodb.com">A. Jesse Jiryu Davis</reporter>
                        <labels>
                    </labels>
                <created>Thu, 29 Mar 2018 12:48:27 +0000</created>
                <updated>Mon, 8 Jan 2024 15:23:06 +0000</updated>
                            <resolved>Thu, 19 Apr 2018 22:47:07 +0000</resolved>
                                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1869587" author="spencer" created="Thu, 19 Apr 2018 22:47:07 +0000"  >&lt;p&gt;We will do &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34551&quot; title=&quot;Add failpoint to fail commands with network errors or arbitrary error codes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34551&quot;&gt;&lt;del&gt;SERVER-34551&lt;/del&gt;&lt;/a&gt; instead&lt;/p&gt;</comment>
                            <comment id="1855722" author="spencer" created="Wed, 4 Apr 2018 22:03:02 +0000"  >&lt;p&gt;Why would you run them concurrently?  If the connection you run closeAllConnections on doesn&apos;t get closed, then you run closeAllConnections, wait for a response, then on another connection you run commitTransaction, which will now fail with a socket error.&lt;/p&gt;</comment>
                            <comment id="1855602" author="shane.harvey" created="Wed, 4 Apr 2018 20:33:42 +0000"  >&lt;p&gt;The problem is that drivers have no way of running two commands at exactly the same time on the server. &lt;/p&gt;</comment>
                            <comment id="1855434" author="spencer" created="Wed, 4 Apr 2018 18:40:05 +0000"  >&lt;p&gt;Ah, so you&apos;re worried about the case where closeAllConnections starts running, closes the connection that it is running on, the driver gets a network error, runs commitTransaction, and the server receives and runs commitTransaction all before the closeAllConnectsion gets around to closing the connection that commitTransaction is running on?  Yeah that does sound like a race.  &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=mira.carey%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;mira.carey@mongodb.com&quot;&gt;mira.carey@mongodb.com&lt;/a&gt;, do you have a sense for how difficult it would be to have a function that closes all incoming connections to mongod &lt;b&gt;except&lt;/b&gt; the connection that the request is currently running on?&lt;/p&gt;</comment>
                            <comment id="1854500" author="shane.harvey" created="Tue, 3 Apr 2018 23:19:44 +0000"  >&lt;p&gt;I&apos;m not sure we can rely on what you&apos;ve described for testing. It sounds like drivers would need to run closeAllConnections and commit concurrently. In that case, any of the following could occur:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;&lt;tt&gt;closeAllConnections&lt;/tt&gt; completes before the commit command, commit succeeds.&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;closeAllConnections&lt;/tt&gt; completes after the commit command, commit succeeds.&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;closeAllConnections&lt;/tt&gt; completes in parallel to the commit command, commit fails with a network error.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;I think we need a way to &lt;b&gt;deterministically&lt;/b&gt; cause a network error.&lt;/p&gt;</comment>
                            <comment id="1854492" author="spencer" created="Tue, 3 Apr 2018 23:01:12 +0000"  >&lt;p&gt;The command would immediately close all network connections coming in to the server, so it&apos;s likely (though racy) that you won&apos;t get the response from the closeAllConnections command.  There&apos;s no way for the server to predict what connection is going to have an isMaster come in on it soon, so it would be up to the drivers to deal with SDAM failures.&lt;/p&gt;

&lt;p&gt;If the goal is to use this to force a network error on the commitTransaction command, I imagine you would run the closeAllConnections command on a different connection than you run the commitTransaction command, so that if there&apos;s any auto-reconnect behavior built in, it won&apos;t already have reconnected the connection after the network error received from running closeAllConnections.&lt;/p&gt;</comment>
                            <comment id="1853919" author="shane.harvey" created="Tue, 3 Apr 2018 20:05:46 +0000"  >&lt;p&gt;So the proposed command would cause &lt;b&gt;the next&lt;/b&gt; command to hang up all connections?&lt;/p&gt;

&lt;p&gt;Something like:&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;&amp;gt; db.adminCommand(&quot;hangupAllConnections&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;&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;{ &quot;ok&quot; : 1 }&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;&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;&amp;gt; db.adminCommand({&quot;commitTransaction&quot;:1, ...})&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;   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;&amp;lt;NetworkError&amp;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;I think that would work. We might want a way to provide a black/white list of commands though. We would not want isMaster issued from SDAM to cause a network failure in between the hangupAllConnections and commit commands.&lt;/p&gt;</comment>
                            <comment id="1852912" author="jesse" created="Mon, 2 Apr 2018 23:05:02 +0000"  >&lt;p&gt;I think that sounds great. &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=shane.harvey&quot; class=&quot;user-hover&quot; rel=&quot;shane.harvey&quot;&gt;shane.harvey&lt;/a&gt; what do you think?&lt;/p&gt;</comment>
                            <comment id="1852901" author="spencer" created="Mon, 2 Apr 2018 22:48:48 +0000"  >&lt;p&gt;What about a test command to hang up all connections?  Then you could just run that command any time you want the next command to fail with a network error?  That might be more future-proof.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jesse&quot; class=&quot;user-hover&quot; rel=&quot;jesse&quot;&gt;jesse&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
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                                        <issuelink>
            <issuekey id="530551">SERVER-34551</issuekey>
        </issuelink>
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                                                        </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="514726">SERVER-34057</issuekey>
        </issuelink>
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