<!-- 
RSS generated by JIRA (9.7.1#970001-sha1:2222b88b221c4928ef0de3161136cc90c8356a66) at Thu Feb 08 04:29:39 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>[SERVER-32236] Avoid stalling ftdc when system is struggling</title>
                <link>https://jira.mongodb.org/browse/SERVER-32236</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;FTDC can stall for a few reasons when the system is struggling, but this is just when it might be most helpful. Reasons include&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;out of tickets&lt;/li&gt;
	&lt;li&gt;cache is full and ftdc thread gets used to do evictions  - the ignore_cache_size session option (&lt;a href=&quot;https://jira.mongodb.org/browse/WT-2932&quot; title=&quot;Allow applications to selectively ignore cache limit with in-memory configuration&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-2932&quot;&gt;&lt;del&gt;WT-2932&lt;/del&gt;&lt;/a&gt;) might help here&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;We should arrange for FTDC not to get stalled by these conditions.&lt;/p&gt;</description>
                <environment></environment>
        <key id="470028">SERVER-32236</key>
            <summary>Avoid stalling ftdc when system is struggling</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="mark.benvenuto@mongodb.com">Mark Benvenuto</assignee>
                                    <reporter username="bruce.lucas@mongodb.com">Bruce Lucas</reporter>
                        <labels>
                            <label>SWDI</label>
                    </labels>
                <created>Fri, 8 Dec 2017 20:37:15 +0000</created>
                <updated>Tue, 14 Aug 2018 03:02:43 +0000</updated>
                            <resolved>Tue, 17 Jul 2018 19:03:27 +0000</resolved>
                                                                    <component>Diagnostics</component>
                                        <votes>34</votes>
                                    <watches>26</watches>
                                                                                                                <comments>
                            <comment id="1783508" author="dan@10gen.com" created="Wed, 24 Jan 2018 16:02:27 +0000"  >&lt;p&gt;I agree that a partial solution here is better than waiting for a perfect one.  If necessary, can we identify and split out the ones we know about so we can make incremental progress here?&lt;/p&gt;</comment>
                            <comment id="1761214" author="bruce.lucas@10gen.com" created="Fri, 29 Dec 2017 02:13:01 +0000"  >&lt;p&gt;Agreed, we may have to identify more causes of blocking than the two called out in the initial comment. However my experience is that those are the two most common so if we can address those we will have made a large improvement. &lt;/p&gt;</comment>
                            <comment id="1761110" author="mark.benvenuto" created="Thu, 28 Dec 2017 22:08:30 +0000"  >&lt;p&gt;In general this is a difficult problem. We can make incremental improvements to serverStatus, write ticket handling and a few other things to reduce the chances of of FTDC blocking, but it will be difficult to eliminate blocking completely.&lt;/p&gt;

&lt;p&gt;If we make a more aggressive design change, we could treat the various input sources into FTDC as independent and query them asynchronously in multiple threads. Basically, do a scatter gather query across all the sources, but then each source will be from a slightly different time which may make the results less useful. Also, this would not eliminate the blocking. It would just mean that when a server is stuck, you get some data, but you still be missing serverStatus for instance since it is the one that tends to get blocked.&lt;/p&gt;</comment>
                            <comment id="1751194" author="bruce.lucas@10gen.com" created="Wed, 13 Dec 2017 19:02:34 +0000"  >&lt;p&gt;I&apos;m thinking that&apos;s due to accumulating blocked read operations during the index build and then running out of tickets as a result, in which case it&apos;s covered by the first item, but if you have information to the contrary it would be useful to look into that.&lt;/p&gt;</comment>
                            <comment id="1751123" author="james.kovacs" created="Wed, 13 Dec 2017 17:58:43 +0000"  >&lt;p&gt;A long-running foreground index build on a secondary can also stall FTDC data collection. The system need not even be struggling for the stall to occur.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10011">
                    <name>Depends</name>
                                            <outwardlinks description="depends on">
                                        <issuelink>
            <issuekey id="486835">SERVER-32876</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="486834">SERVER-32875</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is depended on by">
                                                        </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                                        </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="469944">SERVER-32226</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                    </issuelinks>
                <attachments>
                    </attachments>
                <subtasks>
                    </subtasks>
                <customfields>
                                                <customfield id="customfield_10050" key="com.atlassian.jira.toolkit:comments">
                        <customfieldname># Replies</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>5.0</customfieldvalue>
                        </customfieldvalues>
                    </customfield>
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        <customfield id="customfield_13552" key="com.go2group.jira.plugin.crm:crm_generic_field">
                        <customfieldname>Case</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue><![CDATA[[500A000000Z5GZgIAN, 500A000000Z4cORIAZ, 500A000000aOMUKIA4, 500A000000aPFkpIAG]]]></customfieldvalue>

                        </customfieldvalues>
                    </customfield>
                                                                                                                                                                                                                                                                                                                            <customfield id="customfield_10055" key="com.atlassian.jira.ext.charting:firstresponsedate">
                        <customfieldname>Date of 1st Reply</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>Wed, 13 Dec 2017 17:58:43 +0000</customfieldvalue>

                        </customfieldvalues>
                    </customfield>
                                                                <customfield id="customfield_10052" key="com.atlassian.jira.toolkit:dayslastcommented">
                        <customfieldname>Days since reply</customfieldname>
                        <customfieldvalues>
                                        6 years, 3 weeks ago
    
                        </customfieldvalues>
                    </customfield>
                                                                <customfield id="customfield_18254" key="com.onresolve.jira.groovy.groovyrunner:scripted-field">
                        <customfieldname>Dependencies</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue><![CDATA[<s><a href='https://jira.mongodb.org/browse/SERVER-32875'>SERVER-32875</a></s>, <s><a href='https://jira.mongodb.org/browse/SERVER-32876'>SERVER-32876</a></s>]]></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_10057" key="com.atlassian.jira.toolkit:lastusercommented">
                        <customfieldname>Last comment by Customer</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>true</customfieldvalue>
                        </customfieldvalues>
                    </customfield>
                                                                                            <customfield id="customfield_10056" key="com.atlassian.jira.toolkit:lastupdaterorcommenter">
                        <customfieldname>Last commenter</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>backlog-server-pm</customfieldvalue>

                        </customfieldvalues>
                    </customfield>
                                                                <customfield id="customfield_11151" key="com.atlassian.jira.toolkit:LastCommentDate">
                        <customfieldname>Last public comment date</customfieldname>
                        <customfieldvalues>
                            6 years, 3 weeks ago
                        </customfieldvalues>
                    </customfield>
                                                                                                                                                    <customfield id="customfield_10032" key="com.atlassian.jira.plugin.system.customfieldtypes:select">
                        <customfieldname>Operating System</customfieldname>
                        <customfieldvalues>
                                <customfieldvalue key="10026"><![CDATA[ALL]]></customfieldvalue>

                        </customfieldvalues>
                    </customfield>
                                                                                                                                                                                <customfield id="customfield_10051" key="com.atlassian.jira.toolkit:participants">
                        <customfieldname>Participants</customfieldname>
                        <customfieldvalues>
                                        <customfieldvalue>bruce.lucas@mongodb.com</customfieldvalue>
            <customfieldvalue>dan@mongodb.com</customfieldvalue>
            <customfieldvalue>james.kovacs@mongodb.com</customfieldvalue>
            <customfieldvalue>mark.benvenuto@mongodb.com</customfieldvalue>
    
                        </customfieldvalues>
                    </customfield>
                                                                                                                                                                                                                                        <customfield id="customfield_14254" key="com.pyxis.greenhopper.jira:gh-lexo-rank">
                        <customfieldname>Product Rank</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>1|hrjrlr:</customfieldvalue>

                        </customfieldvalues>
                    </customfield>
                                                                                                                                                                                <customfield id="customfield_12550" key="com.pyxis.greenhopper.jira:gh-lexo-rank">
                        <customfieldname>Rank</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>2|hr8vnj:</customfieldvalue>

                        </customfieldvalues>
                    </customfield>
                                                                <customfield id="customfield_10558" key="com.pyxis.greenhopper.jira:gh-global-rank">
                        <customfieldname>Rank (Obsolete)</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>9223372036854775807</customfieldvalue>
                        </customfieldvalues>
                    </customfield>
                                                                                            <customfield id="customfield_23361" key="com.onresolve.jira.groovy.groovyrunner:scripted-field">
                        <customfieldname>Requested By</customfieldname>
                        <customfieldvalues>
                                

                        </customfieldvalues>
                    </customfield>
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            <customfield id="customfield_10053" key="com.atlassian.jira.ext.charting:timeinstatus">
                        <customfieldname>Time In Status</customfieldname>
                        <customfieldvalues>
                            
                        </customfieldvalues>
                    </customfield>
                                                                                                                                                                                                                                                                                                                                                                                                                                                                        <customfield id="customfield_22870" key="com.onresolve.jira.groovy.groovyrunner:scripted-field">
                        <customfieldname>Triagers</customfieldname>
                        <customfieldvalues>
                                

                        </customfieldvalues>
                    </customfield>
                                                                                                                                                                                                                                                                                                                                                                                    <customfield id="customfield_14350" key="com.pyxis.greenhopper.jira:gh-lexo-rank">
                        <customfieldname>serverRank</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>1|htlhxr:</customfieldvalue>

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