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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-11021] cache dbhash results in mongod for config. collections</title>
                <link>https://jira.mongodb.org/browse/SERVER-11021</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;div class=&quot;panel&quot; style=&quot;background-color: #EEEEEE;border-color: #ccc;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;border-bottom-color: #ccc;background-color: #6CB33F;&quot;&gt;&lt;b&gt;Issue Status as of November 26th, 2013&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #EEEEEE;&quot;&gt;
&lt;p&gt;&lt;b&gt;ISSUE SUMMARY&lt;/b&gt;&lt;br/&gt;
Cache results of dbhash command for config collections.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;USER IMPACT&lt;/b&gt;&lt;br/&gt;
When multiple mongos instances issue the dbhash command simultaneously, config database can be overloaded and affect performance.&lt;br/&gt;
It is present in versions of MongoDB prior to and including v2.4.6.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;SOLUTION&lt;/b&gt;&lt;br/&gt;
Cache dbhash commands on the server.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;WORKAROUNDS&lt;/b&gt;&lt;br/&gt;
This is a performance improvement only.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;PATCHES&lt;/b&gt;&lt;br/&gt;
Production release v2.4.7 contains the fix for this issue, and production release v2.6.0 will contain the fix as well.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h4&gt;&lt;a name=&quot;OriginalDescription&quot;&gt;&lt;/a&gt;Original Description&lt;/h4&gt;

&lt;p&gt;This will mitigate having lots of mongos doing hashes at the same time.&lt;/p&gt;</description>
                <environment></environment>
        <key id="92569">SERVER-11021</key>
            <summary>cache dbhash results in mongod for config. collections</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="9">Done</resolution>
                                        <assignee username="eliot">Eliot Horowitz</assignee>
                                    <reporter username="eliot">Eliot Horowitz</reporter>
                        <labels>
                    </labels>
                <created>Thu, 3 Oct 2013 15:11:49 +0000</created>
                <updated>Mon, 11 Jul 2016 17:39:54 +0000</updated>
                            <resolved>Fri, 4 Oct 2013 11:54:18 +0000</resolved>
                                                    <fixVersion>2.4.7</fixVersion>
                    <fixVersion>2.5.3</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="436391" author="auto" created="Sun, 6 Oct 2013 22:36:20 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;IanWhalen&apos;, u&apos;name&apos;: u&apos;Ian Whalen&apos;, u&apos;email&apos;: u&apos;ian@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-11021&quot; title=&quot;cache dbhash results in mongod for config. collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-11021&quot;&gt;&lt;del&gt;SERVER-11021&lt;/del&gt;&lt;/a&gt; skip dbhash2.js during sharding_passthrough&lt;br/&gt;
Branch: v2.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/874b42c4a70ab9eea507afbff0dda6d4faa9ebf0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/874b42c4a70ab9eea507afbff0dda6d4faa9ebf0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="436267" author="auto" created="Sat, 5 Oct 2013 20:10:17 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;IanWhalen&apos;, u&apos;name&apos;: u&apos;Ian Whalen&apos;, u&apos;email&apos;: u&apos;ian@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-11021&quot; title=&quot;cache dbhash results in mongod for config. collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-11021&quot;&gt;&lt;del&gt;SERVER-11021&lt;/del&gt;&lt;/a&gt; skip dbhash2.js during sharding_passthrough&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4a075b087bb93598413bd99cc6cba75c313e1bef&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4a075b087bb93598413bd99cc6cba75c313e1bef&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="435694" author="auto" created="Fri, 4 Oct 2013 11:54:01 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;erh&apos;, u&apos;name&apos;: u&apos;Eliot Horowitz&apos;, u&apos;email&apos;: u&apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-11021&quot; title=&quot;cache dbhash results in mongod for config. collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-11021&quot;&gt;&lt;del&gt;SERVER-11021&lt;/del&gt;&lt;/a&gt;: backport to 2.4&lt;br/&gt;
Branch: v2.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/577fe667c612de137251b34f96535e3afc9ad4bb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/577fe667c612de137251b34f96535e3afc9ad4bb&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="435211" author="auto" created="Thu, 3 Oct 2013 15:26:02 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;erh&apos;, u&apos;name&apos;: u&apos;Eliot Horowitz&apos;, u&apos;email&apos;: u&apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-11021&quot; title=&quot;cache dbhash results in mongod for config. collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-11021&quot;&gt;&lt;del&gt;SERVER-11021&lt;/del&gt;&lt;/a&gt;: add pragma once to header&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/61279ce0ba766a181748125d1a8dd48cec0a1d1b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/61279ce0ba766a181748125d1a8dd48cec0a1d1b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="435207" author="auto" created="Thu, 3 Oct 2013 15:23:41 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;erh&apos;, u&apos;name&apos;: u&apos;Eliot Horowitz&apos;, u&apos;email&apos;: u&apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-11021&quot; title=&quot;cache dbhash results in mongod for config. collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-11021&quot;&gt;&lt;del&gt;SERVER-11021&lt;/del&gt;&lt;/a&gt;: add header file&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/fe65e214eb4c230c3a55f4a2744a8d9bd1517bcd&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/fe65e214eb4c230c3a55f4a2744a8d9bd1517bcd&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="435204" author="auto" created="Thu, 3 Oct 2013 15:19:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;erh&apos;, u&apos;name&apos;: u&apos;Eliot Horowitz&apos;, u&apos;email&apos;: u&apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-11021&quot; title=&quot;cache dbhash results in mongod for config. collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-11021&quot;&gt;&lt;del&gt;SERVER-11021&lt;/del&gt;&lt;/a&gt;: cache dbhash results in mongod for config. collections&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5b74302fb716ed3ee812a008d4341a3c4355299d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5b74302fb716ed3ee812a008d4341a3c4355299d&lt;/a&gt;&lt;/p&gt;</comment>
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