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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-20326] Record &quot;apply&quot; batch boundaries during replication</title>
                <link>https://jira.mongodb.org/browse/SERVER-20326</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently we record &quot;minValid&quot; when applying each back during replication as a marker of the (minimum) valid point we must reach to allow reads and to transition out of startup/recovery to secondary/primary. This approach works fine as long as we always apply write to all database and insert the ordered oplog entries as the last step in an atomic write operation.&lt;/p&gt;

&lt;p&gt;The task here is to record both the start and end of each batch so the can do writes in the batch in any order needed. For some storage engines combining writes across database, including recording the oplog entries, performs better and can be optimized but doesn&apos;t work with the current &quot;minValid&quot; safety design.&lt;/p&gt;

&lt;p&gt;Recording both the start and end will allow us to just apply those entries in the case of failure during recovery, or as a indication that replication has not finished.&lt;/p&gt;

&lt;p&gt;When the batch apply is successfully done we will (logically) reset the value to just the end (or &quot;minValid&quot;) to indicate completion and to be backwards compatible (to allow for downgrading).&lt;/p&gt;</description>
                <environment></environment>
        <key id="228959">SERVER-20326</key>
            <summary>Record &quot;apply&quot; batch boundaries during replication</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="scotthernandez">Scott Hernandez</assignee>
                                    <reporter username="scotthernandez">Scott Hernandez</reporter>
                        <labels>
                    </labels>
                <created>Wed, 9 Sep 2015 14:54:55 +0000</created>
                <updated>Fri, 8 Jan 2016 19:32:58 +0000</updated>
                            <resolved>Thu, 1 Oct 2015 12:38:04 +0000</resolved>
                                                    <fixVersion>3.1.9</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1052808" author="xgen-internal-githook" created="Tue, 6 Oct 2015 18:16:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;scotthernandez&apos;, u&apos;name&apos;: u&apos;Scott Hernandez&apos;, u&apos;email&apos;: u&apos;scotthernandez@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20326&quot; title=&quot;Record &amp;quot;apply&amp;quot; batch boundaries during replication&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20326&quot;&gt;&lt;del&gt;SERVER-20326&lt;/del&gt;&lt;/a&gt;: Make sure to update the existing minvalid doc if it exists&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7f62960716b37662070ba6fada747c60f5968c09&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7f62960716b37662070ba6fada747c60f5968c09&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1049952" author="xgen-internal-githook" created="Fri, 2 Oct 2015 15:52:01 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;scotthernandez&apos;, u&apos;name&apos;: u&apos;Scott Hernandez&apos;, u&apos;email&apos;: u&apos;scotthernandez@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20326&quot; title=&quot;Record &amp;quot;apply&amp;quot; batch boundaries during replication&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20326&quot;&gt;&lt;del&gt;SERVER-20326&lt;/del&gt;&lt;/a&gt;: fix apply batch boundaries test&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b8cc9df055c727e4afbb730d61e73420954db85a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b8cc9df055c727e4afbb730d61e73420954db85a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1048491" author="xgen-internal-githook" created="Thu, 1 Oct 2015 12:30:53 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;scotthernandez&apos;, u&apos;name&apos;: u&apos;Scott Hernandez&apos;, u&apos;email&apos;: u&apos;scotthernandez@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20326&quot; title=&quot;Record &amp;quot;apply&amp;quot; batch boundaries during replication&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20326&quot;&gt;&lt;del&gt;SERVER-20326&lt;/del&gt;&lt;/a&gt;: simplify apply batch boundaries test&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c757c1537b348dedf837aaf6458f7c55506bfef2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c757c1537b348dedf837aaf6458f7c55506bfef2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1043984" author="xgen-internal-githook" created="Fri, 25 Sep 2015 21:34:31 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;scotthernandez&apos;, u&apos;name&apos;: u&apos;Scott Hernandez&apos;, u&apos;email&apos;: u&apos;scotthernandez@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20326&quot; title=&quot;Record &amp;quot;apply&amp;quot; batch boundaries during replication&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20326&quot;&gt;&lt;del&gt;SERVER-20326&lt;/del&gt;&lt;/a&gt;: record apply batch boundaries&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/18de2f3d6bb4c01fb600bbb0e3a2c2e4ab0cc9ee&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/18de2f3d6bb4c01fb600bbb0e3a2c2e4ab0cc9ee&lt;/a&gt;&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="210754">SERVER-18983</issuekey>
        </issuelink>
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            <issuekey id="230307">SERVER-20466</issuekey>
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