<!-- 
RSS generated by JIRA (9.7.1#970001-sha1:2222b88b221c4928ef0de3161136cc90c8356a66) at Thu Feb 08 07:48:26 UTC 2024

It is possible to restrict the fields that are returned in this document by specifying the 'field' parameter in your request.
For example, to request only the issue key and summary append 'field=key&field=summary' to the URL of your request.
-->
<rss version="0.92" >
<channel>
    <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>
    </build-info>


<item>
            <title>[DOCS-4624] Config server hardware considerations</title>
                <link>https://jira.mongodb.org/browse/DOCS-4624</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h5&gt;&lt;a name=&quot;DocumentationChanges&quot;&gt;&lt;/a&gt;Documentation Changes&lt;/h5&gt;
&lt;p&gt;Explain that &quot;Best config server performance can be achieved when they are placed on dedicated servers with enough RAM to hold their data files fully in memory and with &lt;em&gt;dedicated&lt;/em&gt; storage&quot;. Likely belongs on Production Notes.&lt;/p&gt;

&lt;h5&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h5&gt;
&lt;p&gt;Config servers are the central point for metadata storage and retrieval in sharded clusters. Performance of the cluster (e.g. system operations and user queries) might be negatively affected if config servers are not able to provide timely responses.&lt;/p&gt;

&lt;p&gt;First, mongoS services frequently query config servers to retrieve sharded collection metadata and/or its changes. Config servers are queried in order, starting with the first one in the configdb string. If the first one doesn&apos;t respond within a fixed time interval (30 seconds, I think), the second one will be queried, etc. Thus all three config servers should have their data available in RAM for fast responses. Config databases rarely reach more than few GBs, but if your config server shares RAM with other memory-greedy processes (e.g. an active shard node), config data might still be paged out.&lt;/p&gt;

&lt;p&gt;Internally, as part of many metadata change operations, (e.g. splits) mongoS executes the fsync call on all three config servers to confirm that they are up and functional. Since the fsync call instructs the server to flush all data to disk and waits for the flush to complete, its latency fully depend on disk IO that backs up the config server dbpath. If your config servers are sharing disk(s) with other services, their IO might be starved.&lt;/p&gt;

&lt;p&gt;Best config server performance can be achieved when they are placed on dedicated servers with enough RAM to hold their data files fully in memory and with &lt;em&gt;dedicated&lt;/em&gt; storage.&lt;/p&gt;</description>
                <environment>Probably should go to production notes</environment>
        <key id="177545">DOCS-4624</key>
            <summary>Config server hardware considerations</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="andrew.aldridge@mongodb.com">Andrew Aldridge</assignee>
                                    <reporter username="alex.komyagin@mongodb.com">Alexander Komyagin</reporter>
                        <labels>
                    </labels>
                <created>Thu, 8 Jan 2015 04:19:00 +0000</created>
                <updated>Mon, 30 Oct 2023 21:50:08 +0000</updated>
                            <resolved>Tue, 1 Nov 2022 11:03:07 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="4943699" author="edu.bot" created="Tue, 1 Nov 2022 11:03:04 +0000"  >&lt;p&gt;Hello! This ticket has been closed due to inactivity. If you believe this ticket is still important, please reopen it and leave a comment to explain why. Thank you!&lt;/p&gt;</comment>
                            <comment id="1392656" author="kay.kim@10gen.com" created="Sat, 24 Sep 2016 18:08:39 +0000"  >&lt;p&gt;bulk assigning tickets in backlog to team members to groom.&lt;/p&gt;</comment>
                    </comments>
                    <attachments>
                    </attachments>
                <subtasks>
                    </subtasks>
                <customfields>
                                                <customfield id="customfield_10050" key="com.atlassian.jira.toolkit:comments">
                        <customfieldname># Replies</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>2.0</customfieldvalue>
                        </customfieldvalues>
                    </customfield>
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        <customfield id="customfield_10055" key="com.atlassian.jira.ext.charting:firstresponsedate">
                        <customfieldname>Date of 1st Reply</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>Sat, 24 Sep 2016 18:08:39 +0000</customfieldvalue>

                        </customfieldvalues>
                    </customfield>
                                                                <customfield id="customfield_10052" key="com.atlassian.jira.toolkit:dayslastcommented">
                        <customfieldname>Days since reply</customfieldname>
                        <customfieldvalues>
                                        1 year, 14 weeks, 1 day ago
    
                        </customfieldvalues>
                    </customfield>
                                                                <customfield id="customfield_18254" key="com.onresolve.jira.groovy.groovyrunner:scripted-field">
                        <customfieldname>Dependencies</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue><![CDATA[]]></customfieldvalue>


                        </customfieldvalues>
                    </customfield>
                                                                <customfield id="customfield_15850" key="com.atlassian.jira.plugins.jira-development-integration-plugin:devsummary">
                        <customfieldname>Development</customfieldname>
                        <customfieldvalues>
                            
                        </customfieldvalues>
                    </customfield>
                                                                                                                                                                                                            <customfield id="customfield_10857" key="com.pyxis.greenhopper.jira:gh-epic-link">
                        <customfieldname>Epic Link</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>DOCSP-1769</customfieldvalue>
                        </customfieldvalues>
                    </customfield>
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            <customfield id="customfield_10057" key="com.atlassian.jira.toolkit:lastusercommented">
                        <customfieldname>Last comment by Customer</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>false</customfieldvalue>
                        </customfieldvalues>
                    </customfield>
                                                                <customfield id="customfield_10056" key="com.atlassian.jira.toolkit:lastupdaterorcommenter">
                        <customfieldname>Last commenter</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>emet.ozar@mongodb.com</customfieldvalue>

                        </customfieldvalues>
                    </customfield>
                                                                <customfield id="customfield_11151" key="com.atlassian.jira.toolkit:LastCommentDate">
                        <customfieldname>Last public comment date</customfieldname>
                        <customfieldvalues>
                            1 year, 14 weeks, 1 day ago
                        </customfieldvalues>
                    </customfield>
                                                                                                                                                                                                            <customfield id="customfield_10051" key="com.atlassian.jira.toolkit:participants">
                        <customfieldname>Participants</customfieldname>
                        <customfieldvalues>
                                        <customfieldvalue>alex.komyagin@mongodb.com</customfieldvalue>
            <customfieldvalue>andrew.aldridge@mongodb.com</customfieldvalue>
            <customfieldvalue>edu.bot</customfieldvalue>
            <customfieldvalue>kay.kim@mongodb.com</customfieldvalue>
    
                        </customfieldvalues>
                    </customfield>
                                                                                                                                                                                                                                        <customfield id="customfield_14254" key="com.pyxis.greenhopper.jira:gh-lexo-rank">
                        <customfieldname>Product Rank</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>1|hrqljz:</customfieldvalue>

                        </customfieldvalues>
                    </customfield>
                                                                                                                                                                                <customfield id="customfield_12550" key="com.pyxis.greenhopper.jira:gh-lexo-rank">
                        <customfieldname>Rank</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>2|hs59l3:</customfieldvalue>

                        </customfieldvalues>
                    </customfield>
                                                                <customfield id="customfield_10558" key="com.pyxis.greenhopper.jira:gh-global-rank">
                        <customfieldname>Rank (Obsolete)</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>155738</customfieldvalue>
                        </customfieldvalues>
                    </customfield>
                                                                                                                                                                                                                                                                                                                                                        <customfield id="customfield_10555" key="com.atlassian.jira.plugin.system.customfieldtypes:float">
                        <customfieldname>Story Points</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>0.5</customfieldvalue>
                        </customfieldvalues>
                    </customfield>
                                                                                                                                                                                <customfield id="customfield_10053" key="com.atlassian.jira.ext.charting:timeinstatus">
                        <customfieldname>Time In Status</customfieldname>
                        <customfieldvalues>
                            
                        </customfieldvalues>
                    </customfield>
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            <customfield id="customfield_14350" key="com.pyxis.greenhopper.jira:gh-lexo-rank">
                        <customfieldname>serverRank</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>1|hrzpnz:</customfieldvalue>

                        </customfieldvalues>
                    </customfield>
                                                                </customfields>
    </item>
</channel>
</rss>