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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-3747] Maintenance mode writability for replica set secondaries</title>
                <link>https://jira.mongodb.org/browse/SERVER-3747</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Right now, many sorts of operational scenarios for working around bugs or limitations or operator errors require restarting replica set members without --replSet in order to be able to write some collections.  This is kind of cumbersome for normal people.  If some kind of online maintenance mode could allow users to write to the replicating secondary (possibly pausing replication for the duration of the maintenance), that would make these scenarios easier for people to work with.&lt;/p&gt;

&lt;p&gt;Things I&apos;m thinking of:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;resizing the oplog&lt;/li&gt;
	&lt;li&gt;fixing a replica set configuration if the member doesn&apos;t like it and goes into a bad state&lt;/li&gt;
	&lt;li&gt;(maybe) building indexes on secondaries, so that not all secondaries in a set get their index build commands at the same time&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="21791">SERVER-3747</key>
            <summary>Maintenance mode writability for replica set secondaries</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="richard.kreuter">Richard Kreuter</reporter>
                        <labels>
                    </labels>
                <created>Thu, 1 Sep 2011 18:35:28 +0000</created>
                <updated>Tue, 6 Dec 2022 05:41:06 +0000</updated>
                                                                            <component>Replication</component>
                                        <votes>1</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2476131" author="sheeri.cabral" created="Thu, 10 Oct 2019 17:46:24 +0000"  >&lt;p&gt;Linking the PM ticket for a unified &quot;drain&quot; (unlading) mode.&lt;/p&gt;</comment>
                            <comment id="721105" author="scotthernandez" created="Wed, 17 Sep 2014 18:42:39 +0000"  >&lt;p&gt;Another option would be to have a wrapper/umbrella command which turns on maintenance, runs the supplied commands and turns off maint. mode when successful.&lt;/p&gt;

&lt;p&gt;We could probably just add options to the existing maintenance command, replSetMaintenance:&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; var tasks = [{replSetPauseReplication:1}, {createIndex...}, {resizeOplog:...}, ... {replSetResumeReplication:1}];&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&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; rs.maintenance(tasks)&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;gt; db.adminCommand({replSetMaintenance:1, tasks: tasks})&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;This ensures that only those commands would be allowed to run and not any/all externally sent commands if any command was allowed to be run on secondary.&lt;/p&gt;</comment>
                            <comment id="52330" author="eliot" created="Sat, 3 Sep 2011 03:45:21 +0000"  >
&lt;p&gt;I really like the way compact works.&lt;/p&gt;

&lt;p&gt;You run compact, it first changes state to recovering, does compact, turns into secondary again.&lt;/p&gt;

&lt;p&gt;So I could imagine that sort of api&lt;/p&gt;</comment>
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                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="127657">SERVER-13355</issuekey>
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