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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-4984] make it possible to interrupt operations in mongos</title>
                <link>https://jira.mongodb.org/browse/SERVER-4984</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The aggregation framework pipeline components can run in either mongod or mongos, depending on whether they operate on grouped (or sorted) documents.  For &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-4844&quot; title=&quot;can&amp;#39;t killop an aggregation operation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-4844&quot;&gt;&lt;del&gt;SERVER-4844&lt;/del&gt;&lt;/a&gt;, code was added that would enable interruption of aggregation operations via currentOp/killOp.  However, this doesn&apos;t work in mongos, because there&apos;s no provision for doing that there.  Something needs to be created that can be used in the implementation of the InterruptStatusMongos class (in interrupt_status_mongos.cpp).&lt;/p&gt;</description>
                <environment></environment>
        <key id="30770">SERVER-4984</key>
            <summary>make it possible to interrupt operations in mongos</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="dan@mongodb.com">Daniel Pasette</reporter>
                        <labels>
                    </labels>
                <created>Thu, 16 Feb 2012 03:32:42 +0000</created>
                <updated>Tue, 6 Dec 2022 05:36:21 +0000</updated>
                            <resolved>Mon, 2 Apr 2018 17:43:01 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>1</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1852472" author="david.storch" created="Mon, 2 Apr 2018 17:42:48 +0000"  >&lt;p&gt;Hi all,&lt;/p&gt;

&lt;p&gt;This work is completed and will first be available in the 3.7.4 development release, which will evolve into the 4.0 stable release series.&lt;/p&gt;

&lt;p&gt;Related ticket &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-18094&quot; title=&quot;currentOp on a mongoS should also show current mongoS operations&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-18094&quot;&gt;&lt;del&gt;SERVER-18094&lt;/del&gt;&lt;/a&gt; made it possible to list all sharded operations which are being executed on a particular mongos, using the &lt;tt&gt;localOps&lt;/tt&gt; flag to the &lt;a href=&quot;https://docs.mongodb.com/manual/reference/operator/aggregation/currentOp/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;$currentOp aggregation metadata source&lt;/a&gt;. For example, you can run the following command against mongos in the shell:&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;mongos&amp;gt; use admin;&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;mongos&amp;gt; db.aggregate([{$currentOp: {localOps: true}}]);&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;Furthermore, mongos operation IDs are now killable due to the changes in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33462&quot; title=&quot;Allow killop on a mongos op id&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33462&quot;&gt;&lt;del&gt;SERVER-33462&lt;/del&gt;&lt;/a&gt;. That is, The &lt;tt&gt;opid&lt;/tt&gt; field for each operation is valid for passing to mongos in a killOp command. Doing so will cause the entire sharded query, including sub-ops on each involved shard, to be terminated in a timely fashion. For instance, to kill a particular sharded operation matching &amp;lt;filter&amp;gt;:&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;mongos&amp;gt; use admin;&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;mongos&amp;gt; let opToKill = db.aggregate([{$currentOp: {localOps: true}}, {$match: &amp;lt;filter&amp;gt;}]).toArray()[0];&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;mongos&amp;gt; let opid = opToKill.opid;&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;mongos&amp;gt; db.killOp(opid)&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;Finally, 3.7.4 contains related enhancements which will cause sharded queries to quickly clean themselves up on all shards in the case of an error (e.g. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32307&quot; title=&quot;Make AsyncResultsMerger kill sequence issue killCursors without waiting for outstanding batches&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32307&quot;&gt;&lt;del&gt;SERVER-32307&lt;/del&gt;&lt;/a&gt;). Due to the enhancements listed above, this ticket can be closed as &quot;Gone Away&quot;.&lt;/p&gt;</comment>
                            <comment id="1787867" author="ian.boros" created="Mon, 29 Jan 2018 16:59:58 +0000"  >&lt;p&gt;Once the sharded kill project is complete, we should close this (perhaps as &quot;gone away&quot;).&lt;/p&gt;</comment>
                            <comment id="1770678" author="kaloian.manassiev" created="Wed, 10 Jan 2018 20:00:54 +0000"  >&lt;p&gt;No problem with me.&lt;/p&gt;</comment>
                            <comment id="1770658" author="david.storch" created="Wed, 10 Jan 2018 19:51:54 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kaloian.manassiev&quot; class=&quot;user-hover&quot; rel=&quot;kaloian.manassiev&quot;&gt;kaloian.manassiev&lt;/a&gt; can we move this onto the query team backlog? It&apos;s related to a project we&apos;re running about improving sharded kill.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10011">
                    <name>Depends</name>
                                            <outwardlinks description="depends on">
                                        <issuelink>
            <issuekey id="51933">SERVER-7210</issuekey>
        </issuelink>
                            </outwardlinks>
                                                        </issuelinktype>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="267681">SERVER-22827</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="234975">SERVER-21004</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="29656">SERVER-4844</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="44604">SERVER-6496</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="198454">SERVER-18094</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="471776">SERVER-32307</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="501591">SERVER-33462</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
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