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    <title>MongoDB Jira</title>
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    <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-38310] Oplog information collection stalls FTDC</title>
                <link>https://jira.mongodb.org/browse/SERVER-38310</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37625&quot; title=&quot;Collect diagnostic information for replication oplog window&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37625&quot;&gt;&lt;del&gt;SERVER-37625&lt;/del&gt;&lt;/a&gt; we added oplog information collection to ftdc in order to have oplog window information (oplog earliest and latest times). This has an unfortunate side effect of stalling ftdc when the system is under stress in waitForAllEarlierOplogWritesToBeVisible while reading the earliest and latest documents from the oplog. This is bad because when the system is under stress is exactly when we need ftdc the most.&lt;/p&gt;

&lt;p&gt;Generally the oplog is large enough that earliest and latest times don&apos;t change very quickly relative to the size of the oplog, so it would be ok if this information was a little stale. Maybe we can use a (short) timeout on this read from the oplog, and if it times out use the last collected information? Or maybe we can do this read without calling waitForAllEarlierOplogWritesToBeVisible because for statistics purposes (I think) it doesn&apos;t really matter whether earlier oplog writes are visible?&lt;/p&gt;</description>
                <environment></environment>
        <key id="640315">SERVER-38310</key>
            <summary>Oplog information collection stalls FTDC</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="13201">Fixed</resolution>
                                        <assignee username="mark.benvenuto@mongodb.com">Mark Benvenuto</assignee>
                                    <reporter username="bruce.lucas@mongodb.com">Bruce Lucas</reporter>
                        <labels>
                    </labels>
                <created>Thu, 29 Nov 2018 14:46:58 +0000</created>
                <updated>Sun, 29 Oct 2023 22:26:16 +0000</updated>
                            <resolved>Thu, 13 Dec 2018 16:45:37 +0000</resolved>
                                                    <fixVersion>4.1.7</fixVersion>
                                                        <votes>0</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="2089758" author="xgen-internal-githook" created="Thu, 13 Dec 2018 16:39:39 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;markbenvenuto&apos;, &apos;email&apos;: &apos;mark.benvenuto@mongodb.com&apos;, &apos;name&apos;: &apos;Mark Benvenuto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38310&quot; title=&quot;Oplog information collection stalls FTDC&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38310&quot;&gt;&lt;del&gt;SERVER-38310&lt;/del&gt;&lt;/a&gt; Oplog information collection stalls FTDC&lt;/p&gt;

&lt;p&gt;Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37625&quot; title=&quot;Collect diagnostic information for replication oplog window&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37625&quot;&gt;&lt;del&gt;SERVER-37625&lt;/del&gt;&lt;/a&gt; Add oplog earliest time to FTDC&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit dd17c8ad0fa2b9b71df5f0b00ec77f58b55c4a5b.&lt;br/&gt;
This reverts commit 98ca46fda7788d13cca31569d6e722699514c1fa.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6d900523fac41857c7fe05a34dd480d1f4b56ec8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6d900523fac41857c7fe05a34dd480d1f4b56ec8&lt;/a&gt;&lt;/p&gt;</comment>
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