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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-9407] Helpers::removeRange always waits for 2 secondaries if secondaryThrottle is true</title>
                <link>https://jira.mongodb.org/browse/SERVER-9407</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Relevant piece of code:&lt;/p&gt;

&lt;p/&gt;
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					&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;            if ( secondaryThrottle &amp;amp;&amp;amp; numDeleted &amp;gt; 0 ) {&lt;/span&gt;&lt;/pre&gt;
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						&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;                if ( ! waitForReplication( c.getLastOp(), 2, 60 /* seconds to wait */ ) ) {&lt;/span&gt;&lt;/pre&gt;
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						&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;                    warning() &amp;lt;&amp;lt; &quot;replication to secondaries for removeRange at least 60 seconds behind&quot; &amp;lt;&amp;lt; endl;&lt;/span&gt;&lt;/pre&gt;
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					&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;                }&lt;/span&gt;&lt;/pre&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;                millisWaitingForReplication += secondaryThrottleTime.millis();&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;            }&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;Note that 2 (num of secondaries to wait) is always passed to waitForReplication. This can cause the delete to needlessly wait for 60 seconds if there are less than 2 secondaries (and worse, if the node is not a member of a replica set at all!)&lt;/p&gt;</description>
                <environment></environment>
        <key id="72392">SERVER-9407</key>
            <summary>Helpers::removeRange always waits for 2 secondaries if secondaryThrottle is true</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="-1">Unassigned</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                    </labels>
                <created>Fri, 19 Apr 2013 16:13:11 +0000</created>
                <updated>Wed, 10 Dec 2014 23:11:48 +0000</updated>
                            <resolved>Fri, 19 Apr 2013 16:18:58 +0000</resolved>
                                    <version>2.4.2</version>
                                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="651302" author="asya" created="Tue, 8 Jul 2014 06:33:54 +0000"  >&lt;p&gt;Note: if majority for replica set is &amp;lt;=1 then secondaryThrottle is set to false at the beginning of migration.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/v2.4.1/src/mongo/s/d_migrate.cpp#L899-L915&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/v2.4.1/src/mongo/s/d_migrate.cpp#L899-L915&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;However, that&apos;s majority for one of the &quot;from&quot; or &quot;to&quot; shards (the &quot;from&quot; shard) - if that&apos;s a replica set with majority&amp;gt;1 but &quot;to&quot; shard is a single server (or replica set with majority=1, or primary with some number of only arbiters) then this behavior (of waiting for w:2) will be triggered.&lt;/p&gt;

&lt;p&gt;This code has been refactored so changing the link to point to 2.4 branch.&lt;/p&gt;

&lt;p&gt;Workaround:  if any shards are not a replica set or don&apos;t have majority&amp;gt;1 then &lt;a href=&quot;http://docs.mongodb.org/manual/tutorial/configure-sharded-cluster-balancer/#change-replication-behavior-for-chunk-migration-secondary-throttle&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;set secondaryThrottle to false&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="317085" author="eliot" created="Fri, 19 Apr 2013 16:18:58 +0000"  >&lt;p&gt;w=2 means primary + 1 secondary&lt;br/&gt;
caller is responsible for knowing if its in a set&lt;/p&gt;</comment>
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            <issuekey id="149458">SERVER-14708</issuekey>
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