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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-17300] Balancer tries to create config.tags index multiple times</title>
                <link>https://jira.mongodb.org/browse/SERVER-17300</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently the balancer ensures the { ns: 1, min: 1 } index on the config.tags collection many times each balancer round &amp;#8212; once per sharded collection.&lt;/p&gt;

&lt;p&gt;Each time this happens, the config servers are first fsync&apos;d, which is expensive and causes a high volume of fsync messages in the config server logs (e.g. as observed on &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16638&quot; title=&quot;remove fsync messages from config server logs&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16638&quot;&gt;&lt;del&gt;SERVER-16638&lt;/del&gt;&lt;/a&gt;).&lt;/p&gt;

&lt;p&gt;The solution is to move &lt;a href=&quot;https://github.com/mongodb/mongo/blob/511a2318599954ce6b58477dd7a1e8236fdb451b/src/mongo/s/balance.cpp#L428-L438&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;lines 428 &amp;#8211; 438 of s/balance.cpp&lt;/a&gt; to be &lt;a href=&quot;https://github.com/mongodb/mongo/blob/511a2318599954ce6b58477dd7a1e8236fdb451b/src/mongo/s/balance.cpp#L377&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;before the start of the loop over sharded collections&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="184534">SERVER-17300</key>
            <summary>Balancer tries to create config.tags index multiple times</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="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="kevin.pulo@mongodb.com">Kevin Pulo</reporter>
                        <labels>
                    </labels>
                <created>Tue, 17 Feb 2015 06:48:30 +0000</created>
                <updated>Wed, 25 Jan 2017 22:01:21 +0000</updated>
                            <resolved>Fri, 27 Feb 2015 16:17:57 +0000</resolved>
                                                    <fixVersion>2.6.13</fixVersion>
                    <fixVersion>3.0.1</fixVersion>
                    <fixVersion>3.1.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1225536" author="xgen-internal-githook" created="Tue, 5 Apr 2016 00:14:40 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;devkev&apos;, u&apos;name&apos;: u&apos;Kevin Pulo&apos;, u&apos;email&apos;: u&apos;kevin.pulo@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-17300&quot; title=&quot;Balancer tries to create config.tags index multiple times&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-17300&quot;&gt;&lt;del&gt;SERVER-17300&lt;/del&gt;&lt;/a&gt; Balancer tries to create config.tags index multiple times&lt;/p&gt;

&lt;p&gt;Conflicts:&lt;br/&gt;
	src/mongo/s/config.cpp&lt;/p&gt;

&lt;p&gt;Cherry-picked from e75edbf8b668a7b2a48c8d495769ebaf83e91bba&lt;br/&gt;
The conflicts were just two #includes which aren&apos;t in s/config.cpp on v2.6&lt;br/&gt;
Branch: v2.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7f81284a7851207226ef52ee55c8ded23fc693c6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7f81284a7851207226ef52ee55c8ded23fc693c6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="842872" author="xgen-internal-githook" created="Wed, 4 Mar 2015 17:08:23 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;renctan&apos;, u&apos;name&apos;: u&apos;Randolph Tan&apos;, u&apos;email&apos;: u&apos;randolph@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-17300&quot; title=&quot;Balancer tries to create config.tags index multiple times&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-17300&quot;&gt;&lt;del&gt;SERVER-17300&lt;/del&gt;&lt;/a&gt; Balancer tries to create config.tags index multiple times&lt;/p&gt;

&lt;p&gt;(cherry picked from commit e75edbf8b668a7b2a48c8d495769ebaf83e91bba)&lt;br/&gt;
Branch: v3.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/286bb637c6056074ae6f84d21c4e4b779d15b1a8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/286bb637c6056074ae6f84d21c4e4b779d15b1a8&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="839014" author="xgen-internal-githook" created="Fri, 27 Feb 2015 16:17:36 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;renctan&apos;, u&apos;name&apos;: u&apos;Randolph Tan&apos;, u&apos;email&apos;: u&apos;randolph@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-17300&quot; title=&quot;Balancer tries to create config.tags index multiple times&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-17300&quot;&gt;&lt;del&gt;SERVER-17300&lt;/del&gt;&lt;/a&gt; Balancer tries to create config.tags index multiple times&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e75edbf8b668a7b2a48c8d495769ebaf83e91bba&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e75edbf8b668a7b2a48c8d495769ebaf83e91bba&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="175858">SERVER-16638</issuekey>
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                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="182067">SERVER-17151</issuekey>
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&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;var st = new ShardingTest({shards:2,mongos:1})&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;st.s.adminCommand({enableSharding: &quot;test&quot;})&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;for(i = 0; i &amp;lt; 100; i++) st.s.adminCommand({shardCollection: &quot;test.&quot; + i.toString(), key: { _id: 1}})&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;then watch 100 messages like this&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;   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; m30000| 2015-02-19T14:44:50.194+1100 [conn9] CMD fsync: sync:1 lock:0&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;flow past every 5-6 seconds, each at most a few millis apart.&lt;/p&gt;</customfieldvalue>

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