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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-70201] Make compact killable</title>
                <link>https://jira.mongodb.org/browse/SERVER-70201</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The long-running part of the &lt;tt&gt;compact&lt;/tt&gt; command is when we actually call into &lt;tt&gt;WT::compact&lt;/tt&gt;. This means there currently a &lt;tt&gt;compact&lt;/tt&gt; command essentially can&apos;t be killed once it has started. &lt;a href=&quot;https://jira.mongodb.org/browse/WT-9636&quot; title=&quot;Provide a way for an application to interrupt a long-running compact command&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-9636&quot;&gt;&lt;del&gt;WT-9636&lt;/del&gt;&lt;/a&gt; added the ability to interrupt &lt;tt&gt;WT::compact&lt;/tt&gt;, so we should make use of it here.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2151243">SERVER-70201</key>
            <summary>Make compact killable</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="13201">Fixed</resolution>
                                        <assignee username="dianna.hohensee@mongodb.com">Dianna Hohensee</assignee>
                                    <reporter username="gregory.noma@mongodb.com">Gregory Noma</reporter>
                        <labels>
                            <label>RDY</label>
                    </labels>
                <created>Tue, 4 Oct 2022 13:24:04 +0000</created>
                <updated>Sun, 29 Oct 2023 21:32:27 +0000</updated>
                            <resolved>Wed, 12 Apr 2023 12:57:32 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="5339991" author="xgen-internal-githook" created="Wed, 12 Apr 2023 01:53:25 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Dianna Hohensee&apos;, &apos;email&apos;: &apos;dianna.hohensee@mongodb.com&apos;, &apos;username&apos;: &apos;DiannaHohensee&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-70201&quot; title=&quot;Make compact killable&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-70201&quot;&gt;&lt;del&gt;SERVER-70201&lt;/del&gt;&lt;/a&gt; Add interruptibility to WT::compact commands from the MDB layer&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1cf4d52fdd4f0ec9c30451a7b0244fdd5581a4e4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1cf4d52fdd4f0ec9c30451a7b0244fdd5581a4e4&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5313428" author="dianna.hohensee" created="Thu, 30 Mar 2023 19:23:03 +0000"  >&lt;p&gt;I&apos;ve taken a look at the code and spoken with Sue about how the WT interrupt logic works. In summary, the MDB layer can specify a callback once in wiredtiger_open(), which will then be checked periodically internally by all WT compact operations. MDB cannot set a callback per WT compact operation.&lt;/p&gt;

&lt;p&gt;Relatively simple solution: if killOp comes in targeting a MDB compact command, then we could set global state to have any active compact operation in WT quit. The interrupted MDB compact command thread would have to unset the global state to fail WT compact operations before exiting.&lt;/p&gt;

&lt;p&gt;Relatively fancy solution: create a new global registry. The registry will correlate MDB compact command operation ID to the WT session ID running the WT compact command. killOp can then cause the MDB compact opid/sessionID in the registry to be set to interrupted, and the WT compact callback will error if the sessionID is set to interrupted.&lt;/p&gt;

&lt;p&gt;The simple solution is not a nice user experience and isn&apos;t really a stepping stone to the fancy solution. I&apos;d recommend just doing all the work in the first place.&lt;/p&gt;</comment>
                    </comments>
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                    <name>Depends</name>
                                            <outwardlinks description="depends on">
                                        <issuelink>
            <issuekey id="2310017">WT-10897</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2098771">WT-9636</issuekey>
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                            <issuelinktype id="10520">
                    <name>Problem/Incident</name>
                                            <outwardlinks description="causes">
                                        <issuelink>
            <issuekey id="2310837">SERVER-75917</issuekey>
        </issuelink>
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                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="2412672">SERVER-79869</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="2309127">SERVER-75814</issuekey>
        </issuelink>
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                            <customfieldvalue>Just an FYI that long running compact commands should be interruptible now, via killOp, even when the code is running in the WT layer. Not certain whom that knowledge affects.</customfieldvalue>

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