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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-9338] db.runCommand( { compact: &apos;&lt;collection&gt;&apos; } ) on a primary decrements maintenanceMode</title>
                <link>https://jira.mongodb.org/browse/SERVER-9338</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We have a replica set with 3 members running MongoDB 2.2.3. After running db.runCommand( &lt;/p&gt;
{ compact: &apos;&amp;lt;collection&amp;gt;&apos; }
&lt;p&gt; ) twice on the primary (first without force: true to see the expected error message, and then again with it to actually compact the collection), rs.status() showed maintenanceMode: -2 for the primary member. After some investigation, I ran the command again (without force: true) and confirmed that it decremented again to -3:&lt;/p&gt;

&lt;p/&gt;
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&lt;p/&gt;

&lt;p&gt;After stepping down the primary, maintenanceMode was not shown in rs.status() on the new primary, but on stepping that one down and the original primary taking over again, it was still -3 there. Restarting mongod appears to have reset maintenanceMode now and it no longer appears in rs.status().&lt;/p&gt;

&lt;p&gt;I couldn&apos;t find any mention of this in the documentation or anywhere online. I&apos;m not familiar with C++ so could easily have missed something, but it looks to me as if the problem might be that there is no check on theReplSet-&amp;gt;isSecondary() when decrementing maintenanceMode in Command::execCommand, to correspond with that check when incrementing it earlier in the method. I have created a commit with this possible fix:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/jennyd/mongo/commit/83a4b60e72d67bde124fed8072994da40945f297&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/jennyd/mongo/commit/83a4b60e72d67bde124fed8072994da40945f297&lt;/a&gt;&lt;/p&gt;</description>
                <environment>GNU/Linux</environment>
        <key id="71572">SERVER-9338</key>
            <summary>db.runCommand( { compact: &apos;&lt;collection&gt;&apos; } ) on a primary decrements maintenanceMode</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="9">Done</resolution>
                                        <assignee username="andrew.emil@10gen.com">Andrew Emil</assignee>
                                    <reporter username="jennyduckett">Jenny Duckett</reporter>
                        <labels>
                            <label>neweng</label>
                            <label>replicaset</label>
                    </labels>
                <created>Thu, 11 Apr 2013 23:32:28 +0000</created>
                <updated>Mon, 11 Jul 2016 17:59:13 +0000</updated>
                            <resolved>Mon, 1 Jul 2013 17:52:45 +0000</resolved>
                                    <version>2.2.3</version>
                                    <fixVersion>2.5.1</fixVersion>
                                    <component>Replication</component>
                    <component>Shell</component>
                                        <votes>1</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="354668" author="auto" created="Thu, 6 Jun 2013 18:19:18 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;AndrewCEmil&apos;, u&apos;name&apos;: u&apos;AndrewCEmil&apos;, u&apos;email&apos;: u&apos;andrew.emil@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-9338&quot; title=&quot;db.runCommand( { compact: &amp;#39;&amp;lt;collection&amp;gt;&amp;#39; } ) on a primary decrements maintenanceMode&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-9338&quot;&gt;&lt;del&gt;SERVER-9338&lt;/del&gt;&lt;/a&gt; ensure maintenanceMode properly decremented&lt;br/&gt;
-created MaintenanceModeSetter for setting maintenance mode&lt;br/&gt;
-used MaintenanceModeSetter to avoid incorrectly decrementing maintenance mode&lt;br/&gt;
-added assert in rs.cpp to confirm maintenance mode never goes negative&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/80cc5892d74c9377d4a2c08087affe5b9852d120&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/80cc5892d74c9377d4a2c08087affe5b9852d120&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="321660" author="silver" created="Thu, 25 Apr 2013 19:15:12 +0000"  >&lt;p&gt;Can we expect this fix to be backported to 2.4.x? It would be really helpful...&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="71487">SERVER-9326</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="76914">SERVER-9800</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="45773">SERVER-6643</issuekey>
        </issuelink>
                            </inwardlinks>
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                            <customfieldvalue>&lt;ol&gt;
	&lt;li&gt;Create a replica set with 3 members under MongoDB 2.2.3&lt;/li&gt;
	&lt;li&gt;Run db.runCommand( 
{ compact: &apos;&amp;lt;collection&amp;gt;&apos; }
&lt;p&gt; ) in the mongo shell for the primary&lt;/p&gt;&lt;/li&gt;
	&lt;li&gt;Note that this produces an error, as expected&lt;/li&gt;
	&lt;li&gt;Run rs.status() - maintenanceMode will be -1 for the primary member.&lt;/li&gt;
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&lt;p&gt;Each time step 2 above is repeated, maintenanceMode is decremented one more for the primary (with or without force: true).&lt;/p&gt;</customfieldvalue>

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