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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-26464] Poor compression of diagnostic data when secondary falls off the oplog</title>
                <link>https://jira.mongodb.org/browse/SERVER-26464</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When the secondary falls off the oplog there are frequent schema changes in the diagnostic data (every few seconds) which results in very poor compression and much reduced retention period for diagnostic data.&lt;/p&gt;

&lt;p&gt;The cause is that the replica set status infoMessage field with the string &quot;could not find member to sync from&quot; comes and goes periodically about every 5 seconds.&lt;/p&gt;

&lt;p&gt;I believe this could be fixed by ignoring fields that do not contribute to ftdc data, such as strings, before comparing the schema of the current sample with the reference sample, instead of ignoring them after the comparison.&lt;/p&gt;</description>
                <environment></environment>
        <key id="321259">SERVER-26464</key>
            <summary>Poor compression of diagnostic data when secondary falls off the oplog</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="3">Duplicate</resolution>
                                        <assignee username="mark.benvenuto@mongodb.com">Mark Benvenuto</assignee>
                                    <reporter username="bruce.lucas@mongodb.com">Bruce Lucas</reporter>
                        <labels>
                    </labels>
                <created>Wed, 5 Oct 2016 13:09:24 +0000</created>
                <updated>Tue, 8 Sep 2020 23:32:52 +0000</updated>
                            <resolved>Tue, 8 Sep 2020 23:32:52 +0000</resolved>
                                                                    <component>Diagnostics</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="3381131" author="mark.benvenuto" created="Tue, 8 Sep 2020 23:32:52 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34864&quot; title=&quot;String-valued fields should not participate in schema change detection in ftdc&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34864&quot;&gt;&lt;del&gt;SERVER-34864&lt;/del&gt;&lt;/a&gt; did the work to ignore changes from fields that are not part of the FTDC compression payload.&lt;/p&gt;</comment>
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