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<channel>
    <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>
    </build-info>


<item>
            <title>[SERVER-21693] Log a rollback summary</title>
                <link>https://jira.mongodb.org/browse/SERVER-21693</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When a rollback is performed we should provide a summary statement in the mongoD log which provides:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Success/failure of the rollback&lt;/li&gt;
	&lt;li&gt;A clear summary of the actions performed&lt;/li&gt;
	&lt;li&gt;The name and location of any rollback files written&lt;/li&gt;
	&lt;li&gt;A unique tag/ID that could be used for alert purposes&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;The following is an example of what we print in 3.2.0-rc4. This example is rolling back 2 documents that this member contained and the primary did not. There is a summary of the actions taken (&quot;rollback 5 d:2 u:0&quot;) but it is not in a form most users will understand.&lt;/p&gt;
&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;data/replset/rs2/mongod.log:2015-11-30T10:19:30.578-0500 I REPL     [rsBackgroundSync] starting rollback: OplogStartMissing our last op time fetched: (term: 2, timestamp: Nov 30 10:18:47:1). source&apos;s GTE: (term: 3, timestamp: Nov 30 10:19:18:2) hashes: (605599081996457668/881505516521125255)&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;data/replset/rs2/mongod.log:2015-11-30T10:19:30.579-0500 I REPL     [rsBackgroundSync] beginning rollback&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;data/replset/rs2/mongod.log:2015-11-30T10:19:30.580-0500 I REPL     [rsBackgroundSync] rollback 0&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;data/replset/rs2/mongod.log:2015-11-30T10:19:30.580-0500 I REPL     [ReplicationExecutor] transition to ROLLBACK&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;data/replset/rs2/mongod.log:2015-11-30T10:19:30.581-0500 I REPL     [rsBackgroundSync] rollback 1&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;data/replset/rs2/mongod.log:2015-11-30T10:19:30.585-0500 I REPL     [rsBackgroundSync] rollback 2 FindCommonPoint&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;data/replset/rs2/mongod.log:2015-11-30T10:19:30.586-0500 I REPL     [rsBackgroundSync] rollback our last optime:   Nov 30 10:18:47:1&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;data/replset/rs2/mongod.log:2015-11-30T10:19:30.586-0500 I REPL     [rsBackgroundSync] rollback their last optime: Nov 30 10:19:18:2&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;data/replset/rs2/mongod.log:2015-11-30T10:19:30.587-0500 I REPL     [rsBackgroundSync] rollback diff in end of log times: -31 seconds&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;data/replset/rs2/mongod.log:2015-11-30T10:19:30.587-0500 I REPL     [rsBackgroundSync] rollback 3 fixup&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;data/replset/rs2/mongod.log:2015-11-30T10:19:30.589-0500 I REPL     [rsBackgroundSync] rollback 3.5&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;data/replset/rs2/mongod.log:2015-11-30T10:19:30.589-0500 I REPL     [rsBackgroundSync] rollback 4 n:1&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;data/replset/rs2/mongod.log:2015-11-30T10:19:30.591-0500 I REPL     [rsBackgroundSync] rollback 4.6&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;data/replset/rs2/mongod.log:2015-11-30T10:19:30.591-0500 I REPL     [rsBackgroundSync] rollback 4.7&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;data/replset/rs2/mongod.log:2015-11-30T10:19:30.594-0500 I REPL     [rsBackgroundSync] rollback 5 d:2 u:0&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;data/replset/rs2/mongod.log:2015-11-30T10:19:30.594-0500 I REPL     [rsBackgroundSync] rollback 6&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;data/replset/rs2/mongod.log:2015-11-30T10:19:30.595-0500 I REPL     [rsBackgroundSync] rollback done&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;data/replset/rs2/mongod.log:2015-11-30T10:19:30.597-0500 I REPL     [rsBackgroundSync] rollback finished&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</description>
                <environment></environment>
        <key id="241412">SERVER-21693</key>
            <summary>Log a rollback summary</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="kyle.suarez@mongodb.com">Kyle Suarez</assignee>
                                    <reporter username="james.wahlin@mongodb.com">James Wahlin</reporter>
                        <labels>
                            <label>rollback-non-functional</label>
                    </labels>
                <created>Mon, 30 Nov 2015 15:26:19 +0000</created>
                <updated>Tue, 18 Feb 2020 22:32:13 +0000</updated>
                            <resolved>Thu, 29 Mar 2018 19:22:18 +0000</resolved>
                                                    <fixVersion>3.7.4</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>13</watches>
                                                                                                                <comments>
                            <comment id="1849539" author="xgen-internal-githook" created="Thu, 29 Mar 2018 19:20:13 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;kyle.suarez@mongodb.com&apos;, &apos;name&apos;: &apos;Kyle Suarez&apos;, &apos;username&apos;: &apos;ksuarz&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21693&quot; title=&quot;Log a rollback summary&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21693&quot;&gt;&lt;del&gt;SERVER-21693&lt;/del&gt;&lt;/a&gt; generate a summary after rollback via recover to timestamp&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e5f6c368bd34bb9122c0085401d2ead3d4d3f78c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e5f6c368bd34bb9122c0085401d2ead3d4d3f78c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1849538" author="xgen-internal-githook" created="Thu, 29 Mar 2018 19:20:11 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;kyle.suarez@mongodb.com&apos;, &apos;name&apos;: &apos;Kyle Suarez&apos;, &apos;username&apos;: &apos;ksuarz&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21693&quot; title=&quot;Log a rollback summary&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21693&quot;&gt;&lt;del&gt;SERVER-21693&lt;/del&gt;&lt;/a&gt; add host and port to oplog interface&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e1cb7f58d887815ae696a824291fdfc59fc35861&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e1cb7f58d887815ae696a824291fdfc59fc35861&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1848927" author="xgen-internal-githook" created="Thu, 29 Mar 2018 13:19:41 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;kyle.suarez@mongodb.com&apos;, &apos;name&apos;: &apos;Kyle Suarez&apos;, &apos;username&apos;: &apos;ksuarz&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21693&quot; title=&quot;Log a rollback summary&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21693&quot;&gt;&lt;del&gt;SERVER-21693&lt;/del&gt;&lt;/a&gt; generate a summary after rollback via recover to timestamp&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit fee5ac1166c2b4a0a11e00e58f2d9c12d4567e25.&lt;/p&gt;

&lt;p&gt; Conflicts:&lt;br/&gt;
	src/mongo/db/op_observer.h&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6f706d7893cc54ebcf52ee4bc98ad3612dc0d99b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6f706d7893cc54ebcf52ee4bc98ad3612dc0d99b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1847695" author="kay.kim@10gen.com" created="Wed, 28 Mar 2018 13:34:06 +0000"  >&lt;p&gt;Thanks &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kyle.suarez&quot; class=&quot;user-hover&quot; rel=&quot;kyle.suarez&quot;&gt;kyle.suarez&lt;/a&gt; &amp;#8211; Probably will add a note to the rollback page to check the log message.  We already have a generic &lt;a href=&quot;https://docs.mongodb.com/manual/reference/log-messages/index.html#ROLLBACK&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/reference/log-messages/index.html#ROLLBACK&lt;/a&gt; section in the log message page, so it&apos;ll be a quick blurb that you can check the rollback status in the log messages or something.&lt;/p&gt;</comment>
                            <comment id="1847657" author="kyle.suarez" created="Wed, 28 Mar 2018 12:47:10 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kay.kim&quot; class=&quot;user-hover&quot; rel=&quot;kay.kim&quot;&gt;kay.kim&lt;/a&gt;, I&apos;m marking documentation changes as &quot;Not Needed&quot;, as the new rollback algorithm doesn&apos;t change anything to make &lt;a href=&quot;https://docs.mongodb.com/manual/core/replica-set-rollbacks/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/core/replica-set-rollbacks/&lt;/a&gt; outdated. However, we will now have a new rollback summary section that gets printed to the logs and looks something like this: &lt;a href=&quot;https://gist.github.com/ksuarz/562faa6e84710331ff1be69df80475c1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://gist.github.com/ksuarz/562faa6e84710331ff1be69df80475c1&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Just giving the docs team a heads up in case this is something interesting to document.&lt;/p&gt;</comment>
                            <comment id="1847646" author="xgen-internal-githook" created="Wed, 28 Mar 2018 12:40:28 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;kyle.suarez@mongodb.com&apos;, &apos;name&apos;: &apos;Kyle Suarez&apos;, &apos;username&apos;: &apos;ksuarz&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21693&quot; title=&quot;Log a rollback summary&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21693&quot;&gt;&lt;del&gt;SERVER-21693&lt;/del&gt;&lt;/a&gt; generate a summary after rollback via recover to timestamp&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/fee5ac1166c2b4a0a11e00e58f2d9c12d4567e25&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/fee5ac1166c2b4a0a11e00e58f2d9c12d4567e25&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1650029" author="spencer" created="Wed, 16 Aug 2017 21:52:49 +0000"  >&lt;p&gt;I agree that surfacing information about what happened during a rollback in a different way than we currently do could be valuable, but that is out of scope for this ticket.  This ticket is simply about ensuring that the new rollback approach maintains parity with the old one.  Can you file a separate feature request describing your proposal for what you&apos;d like to see us do instead &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=robert.guo&quot; class=&quot;user-hover&quot; rel=&quot;robert.guo&quot;&gt;robert.guo&lt;/a&gt;?&lt;/p&gt;</comment>
                            <comment id="1647970" author="robert.guo" created="Mon, 14 Aug 2017 19:54:30 +0000"  >&lt;p&gt;It could be useful to also log the summary in a special collection (e.g. &lt;tt&gt;local.rollback_summary&lt;/tt&gt;) so test suites that introduce random rollbacks can make more precise assertions on the correctness of the cluster during rollback by consulting the rollback summary collection&lt;/p&gt;</comment>
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