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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-25376] Add a hook to check that oplogs in a replset do not diverge</title>
                <link>https://jira.mongodb.org/browse/SERVER-25376</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Add a hook or modify the dbhash hook to check that the oplog matches across replicaset members after calling ReplSetTest.awaitReplication()&lt;/p&gt;

&lt;p&gt;This can&apos;t be done with a simple dbhash comparison because the oplog is a capped collection and the number of documents may not match. We will need to traverse the oplog and ensure that they have a common history by comparing each entry manually.&lt;/p&gt;</description>
                <environment></environment>
        <key id="305538">SERVER-25376</key>
            <summary>Add a hook to check that oplogs in a replset do not diverge</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="jonathan.abrahams">Jonathan Abrahams</assignee>
                                    <reporter username="robert.guo@mongodb.com">Robert Guo</reporter>
                        <labels>
                    </labels>
                <created>Mon, 1 Aug 2016 15:41:13 +0000</created>
                <updated>Fri, 21 Jul 2017 14:59:18 +0000</updated>
                            <resolved>Fri, 30 Sep 2016 20:28:16 +0000</resolved>
                                    <version>3.3.10</version>
                                    <fixVersion>3.4.0-rc0</fixVersion>
                                    <component>Testing Infrastructure</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1398429" author="xgen-internal-githook" created="Sun, 2 Oct 2016 03:13:39 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;hptabster&apos;, u&apos;name&apos;: u&apos;Jonathan Abrahams&apos;, u&apos;email&apos;: u&apos;jonathan@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25376&quot; title=&quot;Add a hook to check that oplogs in a replset do not diverge&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25376&quot;&gt;&lt;del&gt;SERVER-25376&lt;/del&gt;&lt;/a&gt; Disable checkOplogs in concurrency tests, since they cause the test to time out due to frequents queries with a COLLSCAN for large oplogs.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/404bb959dbf894c9c238dc712ebeccb2687b8f32&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/404bb959dbf894c9c238dc712ebeccb2687b8f32&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1398093" author="xgen-internal-githook" created="Fri, 30 Sep 2016 20:28:03 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;hptabster&apos;, u&apos;name&apos;: u&apos;Jonathan Abrahams&apos;, u&apos;email&apos;: u&apos;jonathan@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25376&quot; title=&quot;Add a hook to check that oplogs in a replset do not diverge&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25376&quot;&gt;&lt;del&gt;SERVER-25376&lt;/del&gt;&lt;/a&gt; Add checkOplog hook for replica sets&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d4b173439ae08f1c0c71191eb93fd1164245c351&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d4b173439ae08f1c0c71191eb93fd1164245c351&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1390847" author="jonathan.abrahams" created="Thu, 22 Sep 2016 14:49:20 +0000"  >&lt;p&gt;The proposed logic is to traverse backwards through the oplog on the primary, &lt;tt&gt;conn.getDB(&apos;local&apos;).getCollection(&apos;oplog.rs&apos;).find().sort({$natural: -1})&lt;/tt&gt;,  and compare each corresponding document on a secondary until the cursor is exhausted on primary or secondary, or documents fail to match. If there&apos;s a failure, dump oplog entries from both nodes that surround the failure.&lt;/p&gt;</comment>
                            <comment id="1343173" author="judah.schvimer" created="Mon, 1 Aug 2016 15:56:40 +0000"  >&lt;p&gt;We should add this hook to the initial sync passthrough as well after we wait for the initial sync node to get into secondary mode but before we CleanEveryN&lt;/p&gt;</comment>
                    </comments>
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                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="375593">SERVER-28868</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="321267">SERVER-26466</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="406795">SERVER-30256</issuekey>
        </issuelink>
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