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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>
    </build-info>


<item>
            <title>[SERVER-59811] ReshardingOplogFetcher can see the postBatchResumeToken move backwards in time when switching sync sources, stalling the resharding operation</title>
                <link>https://jira.mongodb.org/browse/SERVER-59811</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The ReshardingOplogFetcher currently specifies {afterClusterTime: &amp;lt;&amp;#95;id.ts of highest entry&amp;gt;, level: &quot;majority&quot;} when it should instead specify {afterClusterTime: &amp;lt;&amp;#95;id.clusterTime of highest entry&amp;gt;, level: &quot;majority&quot;}. Consider the following sequence:&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;The donor shard prepares and commits a cross&amp;#45;shard transaction which spans multiple oplog entries. Let&apos;s say they have timestamps {ts: 10} and {ts: 12}.&lt;/li&gt;
	&lt;li&gt;The ReshardingOplogFetcher inserts the first oplog entry from the cross&amp;#45;shard transaction. It uses {&amp;#95;id: {clusterTime: 12, ts: 10}} for the first oplog entry.&lt;/li&gt;
	&lt;li&gt;The ReshardingOplogFetcher is restarted. It specifies {afterClusterTime: 10, level: &quot;majority&quot;}.&lt;/li&gt;
	&lt;li&gt;Suppose that the ReshardingOplogFetcher targets a stale secondary within the donor replica set shard. The afterClusterTime will only wait for the stale secondary to have fetched the prepare oplog entry.&lt;/li&gt;
	&lt;li&gt;The ReshardingOplogFetcher receives an empty batch. (This is because resharding&apos;s oplog fetching pipeline only returns oplog entries from multi&amp;#45;statement transaction when they commit or abort.) The postBatchResumeToken value with be {ts: 10} because this is the highest entry in the secondary&apos;s oplog.&lt;/li&gt;
	&lt;li&gt;The changes from &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-49897&quot; title=&quot;Insert no-op entries into oplog buffer collections for resharding so resuming is less wasteful&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-49897&quot;&gt;&lt;del&gt;SERVER-49897&lt;/del&gt;&lt;/a&gt; lead the recipient to insert a synthetic no&amp;#45;op oplog entry into the oplog buffer collection with {&amp;#95;id: {clusterTime: 10, ts: 10}}. This violates the assumption that the oplog buffer collection is always written to in increasing order of &amp;#95;id.&lt;/li&gt;
	&lt;li&gt;If the ReshardingOplogFetcher is restarted again, it&apos;ll specify {&amp;#95;id: {$gt: {&amp;#95;id: {clusterTime: 10, ts: 10}}}} and won&apos;t skip over the first oplog entry with {&amp;#95;id: {clusterTime: 12, ts: 10}}. It will attempt attempt to insert that oplog entry again and trigger a DuplicateKey error.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;The ReshardingOplogFetcher will be perpetually stuck hitting DuplicateKey errors and will prevent the recipient shard from ever reaching the &quot;strict&amp;#45;consistency&quot; state. One solution is to have the ReshardingOplogFetcher specify {afterClusterTime: 12, level: &quot;majority&quot;} so that it could only ever see a postBatchResumeToken value of {ts: 12}.&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&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: #707070;  font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;257&lt;/span&gt;&lt;/pre&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: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;if&lt;/span&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; (_useReadConcern) {&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  bgcolor=&quot;#f5f5f5&quot;  style=&quot; background-color: #f5f5f5 !important;  line-height: 1.4em !important; border-right: 1px solid #bbb; text-align: right; width: 2em; margin: 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: #707070;  font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;258&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;    auto readConcernArgs = repl::ReadConcernArgs(&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  bgcolor=&quot;#6ce26c&quot;  style=&quot; background-color: #6ce26c !important;  line-height: 1.4em !important; border-right: 1px solid #bbb; text-align: right; width: 2em; margin: 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: white;  font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;259&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  bgcolor=&quot;#e0e0e0&quot;  style=&quot; background-color: #e0e0e0 !important; 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;        boost::optional&amp;lt;LogicalTime&amp;gt;(_startAt.getTs()),&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  bgcolor=&quot;#f5f5f5&quot;  style=&quot; background-color: #f5f5f5 !important;  line-height: 1.4em !important; border-right: 1px solid #bbb; text-align: right; width: 2em; margin: 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: #707070;  font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;260&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;        boost::optional&amp;lt;repl::ReadConcernLevel&amp;gt;(repl::ReadConcernLevel::kMajorityReadConcern));&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&lt;td  bgcolor=&quot;#f5f5f5&quot;  style=&quot; background-color: #f5f5f5 !important;  line-height: 1.4em !important; border-right: 1px solid #bbb; text-align: right; width: 2em; margin: 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: #707070;  font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;261&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;    aggRequest.setReadConcern(readConcernArgs.toBSONInner());&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  bgcolor=&quot;#f5f5f5&quot;  style=&quot; background-color: #f5f5f5 !important;  line-height: 1.4em !important; border-right: 1px solid #bbb; text-align: right; width: 2em; margin: 0em; vertical-align: top;&quot;&gt;
							&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot; color: #707070;  font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;262&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;}&lt;/span&gt;&lt;/pre&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/43479818bd01f27ee25b6e992045529d2ac0185a/src/mongo/db/s/resharding/resharding_oplog_fetcher.cpp#L259&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/43479818bd01f27ee25b6e992045529d2ac0185a/src/mongo/db/s/resharding/resharding_oplog_fetcher.cpp#L259&lt;/a&gt;&lt;/p&gt;

&lt;hr /&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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				&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;  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;[js_test:resharding_fuzzer-120e1-1630680862386-9] d20024| 2021-09-03T15:10:16.607+00:00 I  COMMAND  21581   [conn1] &quot;Received replSetStepUp request&quot;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&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;[js_test:resharding_fuzzer-120e1-1630680862386-9] d20024| 2021-09-03T15:10:17.888+00:00 W  RESHARD  5127200 [OplogFetcher-985f9d35-1d7c-4735-9252-e1a426999574-shard0] &quot;Error while fetching, retrying.&quot;,&quot;attr&quot;:{&quot;error&quot;:{&quot;code&quot;:11000,&quot;codeName&quot;:&quot;DuplicateKey&quot;,&quot;errmsg&quot;:&quot;E11000 duplicate key error collection: config.localReshardingOplogBuffer.5163afeb-5991-43f6-a2e2-851827f35529.shard0 index: _id_ dup key: { _id: { clusterTime: Timestamp(1630681816, 10), ts: Timestamp(1630681816, 7) } }&quot;,&quot;keyPattern&quot;:{&quot;_id&quot;:1},&quot;keyValue&quot;:{&quot;_id&quot;:{&quot;clusterTime&quot;:{&quot;$timestamp&quot;:{&quot;t&quot;:1630681816,&quot;i&quot;:10}},&quot;ts&quot;:{&quot;$timestamp&quot;:{&quot;t&quot;:1630681816,&quot;i&quot;:7}}}}}}&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;...&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;[js_test:resharding_fuzzer-120e1-1630680862386-9] d20024| 2021-09-03T15:20:39.030+00:00 W  RESHARD  5127200 [OplogFetcher-985f9d35-1d7c-4735-9252-e1a426999574-shard0] &quot;Error while fetching, retrying.&quot;,&quot;attr&quot;:{&quot;error&quot;:{&quot;code&quot;:11000,&quot;codeName&quot;:&quot;DuplicateKey&quot;,&quot;errmsg&quot;:&quot;E11000 duplicate key error collection: config.localReshardingOplogBuffer.5163afeb-5991-43f6-a2e2-851827f35529.shard0 index: _id_ dup key: { _id: { clusterTime: Timestamp(1630681816, 10), ts: Timestamp(1630681816, 7) } }&quot;,&quot;keyPattern&quot;:{&quot;_id&quot;:1},&quot;keyValue&quot;:{&quot;_id&quot;:{&quot;clusterTime&quot;:{&quot;$timestamp&quot;:{&quot;t&quot;:1630681816,&quot;i&quot;:10}},&quot;ts&quot;:{&quot;$timestamp&quot;:{&quot;t&quot;:1630681816,&quot;i&quot;:7}}}}}}&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;   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;[js_test:resharding_fuzzer-120e1-1630680862386-9] assert.soon failed, msg : Timed out waiting for failpoint to be hit. Failpoint: reshardingPauseCoordinatorBeforeDecisionPersisted The hang analyzer is automatically called in assert.soon functions. If you are *expecting* assert.soon to possibly fail, call assert.soon with {runHangAnalyzer: false} as the fifth argument (you can fill unused arguments with `undefined`). Running hang analyzer from assert.soon.&lt;/span&gt;&lt;/pre&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;&lt;a href=&quot;https://evergreen.mongodb.com/lobster/build/525eaf3cc1abdad83ac549b6da098c9d/test/61323aa854f2483d51452425#bookmarks=0%2C36209%2C37732%2C94544%2C95519&amp;amp;f~=000~%5C%5BResharding.%2AService&amp;amp;f~=100~d20024%5C%7C&amp;amp;f~=110~%28REPL_HB%7CELECTION%29&amp;amp;f~=100~DuplicateKey&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://evergreen.mongodb.com/lobster/build/525eaf3cc1abdad83ac549b6da098c9d/test/61323aa854f2483d51452425#bookmarks=0%2C36209%2C37732%2C94544%2C95519&amp;amp;f~=000~%5C%5BResharding.%2AService&amp;amp;f~=100~d20024%5C%7C&amp;amp;f~=110~%28REPL_HB%7CELECTION%29&amp;amp;f~=100~DuplicateKey&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1868302">SERVER-59811</key>
            <summary>ReshardingOplogFetcher can see the postBatchResumeToken move backwards in time when switching sync sources, stalling the resharding operation</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="max.hirschhorn@mongodb.com">Max Hirschhorn</assignee>
                                    <reporter username="max.hirschhorn@mongodb.com">Max Hirschhorn</reporter>
                        <labels>
                            <label>PM-234-M3</label>
                            <label>PM-234-T-oplog-fetch</label>
                    </labels>
                <created>Tue, 7 Sep 2021 13:30:17 +0000</created>
                <updated>Sun, 29 Oct 2023 21:48:50 +0000</updated>
                            <resolved>Wed, 8 Sep 2021 12:53:08 +0000</resolved>
                                                    <fixVersion>5.0.4</fixVersion>
                    <fixVersion>5.1.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="4106425" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 17:24:41 +0000"  >&lt;p&gt;Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it&#8217;s been triggered. For more active release information, please keep an eye on #server-release. Thank you!&lt;/p&gt;</comment>
                            <comment id="4073288" author="xgen-internal-githook" created="Tue, 21 Sep 2021 02:39:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Max Hirschhorn&apos;, &apos;email&apos;: &apos;max.hirschhorn@mongodb.com&apos;, &apos;username&apos;: &apos;visemet&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-59811&quot; title=&quot;ReshardingOplogFetcher can see the postBatchResumeToken move backwards in time when switching sync sources, stalling the resharding operation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-59811&quot;&gt;&lt;del&gt;SERVER-59811&lt;/del&gt;&lt;/a&gt; Fix afterClusterTime in ReshardingOplogFetcher.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit c37cabcb8913e6ac5353763f80bf5ac7d724de65)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/54a7f116fdf8114246a735910ab96e24182def29&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/54a7f116fdf8114246a735910ab96e24182def29&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4043270" author="xgen-internal-githook" created="Tue, 7 Sep 2021 19:03:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Max Hirschhorn&apos;, &apos;email&apos;: &apos;max.hirschhorn@mongodb.com&apos;, &apos;username&apos;: &apos;visemet&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-59811&quot; title=&quot;ReshardingOplogFetcher can see the postBatchResumeToken move backwards in time when switching sync sources, stalling the resharding operation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-59811&quot;&gt;&lt;del&gt;SERVER-59811&lt;/del&gt;&lt;/a&gt; Fix afterClusterTime in ReshardingOplogFetcher.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c37cabcb8913e6ac5353763f80bf5ac7d724de65&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c37cabcb8913e6ac5353763f80bf5ac7d724de65&lt;/a&gt;&lt;/p&gt;</comment>
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