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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-31040] replace rollback time limit with operation limit</title>
                <link>https://jira.mongodb.org/browse/SERVER-31040</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We should limit rollback during common point resolution to a user-configurable operation limit.&lt;/p&gt;</description>
                <environment></environment>
        <key id="426272">SERVER-31040</key>
            <summary>replace rollback time limit with operation limit</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="vesselina.ratcheva@mongodb.com">Vesselina Ratcheva</assignee>
                                    <reporter username="judah.schvimer@mongodb.com">Judah Schvimer</reporter>
                        <labels>
                            <label>rollback-optional</label>
                    </labels>
                <created>Mon, 11 Sep 2017 20:34:56 +0000</created>
                <updated>Wed, 28 Mar 2018 16:57:39 +0000</updated>
                            <resolved>Wed, 28 Mar 2018 16:57:39 +0000</resolved>
                                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="1847964" author="spencer" created="Wed, 28 Mar 2018 16:57:39 +0000"  >&lt;p&gt;Closing in favor of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31007&quot; title=&quot;Calculate rollback time limit correctly&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31007&quot;&gt;&lt;del&gt;SERVER-31007&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1847194" author="spencer" created="Tue, 27 Mar 2018 21:49:56 +0000"  >&lt;p&gt;Yeah, another option to using an operation limit is to fix our calculations of the time limit.  I think the right approach should be just to compare the wall clock times of the top of our oplog and the common point oplog entry, as opposed to what we currently do which is compare the top of our oplog to the top of our sync source&apos;s oplog.  We should also make the time limit configurable.&lt;/p&gt;

&lt;p&gt;This would basically mean closing this ticket and reviving &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31007&quot; title=&quot;Calculate rollback time limit correctly&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31007&quot;&gt;&lt;del&gt;SERVER-31007&lt;/del&gt;&lt;/a&gt; instead.&lt;/p&gt;

&lt;p&gt;We&apos;d also have to figure out what to do if the time difference winds up negative (due to clock skew).  In that case presumably we&apos;d just ignore it and go ahead with the rollback.&lt;/p&gt;</comment>
                            <comment id="1846668" author="schwerin" created="Tue, 27 Mar 2018 16:25:39 +0000"  >&lt;p&gt;Actually, it&apos;s to stop using a time limit, but we have wall clock times in oplog entries now separate from the table field. Why not pick a time limit using that?&lt;/p&gt;</comment>
                            <comment id="1845966" author="dan@10gen.com" created="Mon, 26 Mar 2018 23:18:30 +0000"  >&lt;p&gt;Imagine a reasonably loaded primary can be handling on the order of 20-40k write ops/sec (this varies wildly depending on hardware, and type of write).  60 seconds of this kind of load may only represent a handful of megabytes of oplog.  Is this to put a backstop in?  Isn&apos;t this ticket all about using a time limit rather than a size-of-oplog/num-ops limit?&lt;/p&gt;</comment>
                            <comment id="1844082" author="daniel.gottlieb@10gen.com" created="Fri, 23 Mar 2018 23:44:11 +0000"  >&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/4ca974b216/src/mongo/db/repl/roll_back_local_operations.cpp#L103-L108&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;One hardcoded value&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=spencer&quot; class=&quot;user-hover&quot; rel=&quot;spencer&quot;&gt;spencer&lt;/a&gt; wanted to make sure was handled when this ticket gets worked on.&lt;/p&gt;</comment>
                            <comment id="1843964" author="spencer" created="Fri, 23 Mar 2018 21:28:10 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=alyson.cabral&quot; class=&quot;user-hover&quot; rel=&quot;alyson.cabral&quot;&gt;alyson.cabral&lt;/a&gt;, would like your input on what a good default value for the number of operations to limit rollbacks to should be.&lt;/p&gt;

&lt;p&gt;I propose 1 million&lt;/p&gt;</comment>
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