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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-60774] Resharding may apply through reshardFinalOp without transitioning to strict consistency, stalling write operations on collection being resharded until critical section times out</title>
                <link>https://jira.mongodb.org/browse/SERVER-60774</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Typically the ReshardingOplogFetcher &lt;a href=&quot;https://github.com/mongodb/mongo/blob/37595d5ee16f06c964b9d416e5847b99c1a537d8/src/mongo/db/s/resharding/resharding_oplog_fetcher.cpp#L339-L342&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;stops fetching new donor oplog entries after it has retrieved the reshardFinalOp entry&lt;/a&gt;. However, upon resuming from a primary failover, the ReshardingOplogFetcher won&apos;t realize it has fetched the reshardFinalOp entry already and it&apos;ll continue to retrieve empty batches. (The donor shard won&apos;t write any new oplog entries destined for the recipient shard after the reshardFinalOp.) This leads the ReshardingOplogFetcher to insert no-op reshardProgressMark entries &lt;em&gt;after&lt;/em&gt; the reshardFinalOp intos the recipient shard&apos;s local oplog buffer collection.&lt;/p&gt;

&lt;p&gt;The ReshardingDonorOplogIterator &lt;a href=&quot;https://github.com/mongodb/mongo/blob/37595d5ee16f06c964b9d416e5847b99c1a537d8/src/mongo/db/s/resharding/resharding_donor_oplog_iterator.cpp#L236&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;assumes the reshardFinalOp will be the last entry in a batch&lt;/a&gt;. The presence of these extra no-op reshardProgressMark entries after the reshardFinalOp will prevent it and the ReshardingOplogApplier from realizing the reshardFinalOp has been applied through. The recipient shard therefore never reaches the &quot;strict&amp;#45;consistency&quot; state. This leads the overall resharding operation to fail with a ReshardingCriticalSectionTimeout error response after writes been blocked for the collection being resharded for reshardingCriticalSectionTimeoutMillis (5 seconds by default).&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;
		&lt;tbody &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;  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; (!batch.empty()) {&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;    &lt;/span&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;const&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; auto&amp;amp; lastEntryInBatch = batch.back();&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;    _resumeToken = getId(lastEntryInBatch);&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;&amp;nbsp;&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;    &lt;/span&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; (isFinalOplog(lastEntryInBatch)) {&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;        _hasSeenFinalOplogEntry = &lt;/span&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;true&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;;&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;        &lt;/span&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// Skip returning the final oplog entry because it is known to be a no-op.&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;   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;        batch.pop_back();&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</description>
                <environment></environment>
        <key id="1900828">SERVER-60774</key>
            <summary>Resharding may apply through reshardFinalOp without transitioning to strict consistency, stalling write operations on collection being resharded until critical section times out</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>
                    </labels>
                <created>Mon, 18 Oct 2021 13:26:33 +0000</created>
                <updated>Sun, 29 Oct 2023 21:47:15 +0000</updated>
                            <resolved>Thu, 21 Oct 2021 11:50:34 +0000</resolved>
                                    <version>5.1.0-rc0</version>
                                    <fixVersion>5.2.0</fixVersion>
                    <fixVersion>5.0.4</fixVersion>
                    <fixVersion>5.1.0-rc2</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4137275" author="xgen-internal-githook" created="Thu, 21 Oct 2021 03:54:24 +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-60774&quot; title=&quot;Resharding may apply through reshardFinalOp without transitioning to strict consistency, stalling write operations on collection being resharded until critical section times out&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-60774&quot;&gt;&lt;del&gt;SERVER-60774&lt;/del&gt;&lt;/a&gt; Early exit in ReshardingOplogFetcher if final op fetched.&lt;/p&gt;

&lt;p&gt;Changes the ReshardingOplogFetcher to return without doing any work when&lt;br/&gt;
the reshardFinalOp entry had already been fetched prior to resuming.&lt;/p&gt;

&lt;p&gt;Also changes ReshardingDonorOplogIterator to throw if it ever sees an&lt;br/&gt;
entry in the local resharding oplog buffer collection after the&lt;br/&gt;
reshardFinalOp entry.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 13093cdb3f878f20e8ebda8ac78f329d1b33a52f)&lt;br/&gt;
Branch: v5.1&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/755a758c98e657e590d862057479baeb4f5a1e1c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/755a758c98e657e590d862057479baeb4f5a1e1c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4137232" author="xgen-internal-githook" created="Thu, 21 Oct 2021 03:07:52 +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-60774&quot; title=&quot;Resharding may apply through reshardFinalOp without transitioning to strict consistency, stalling write operations on collection being resharded until critical section times out&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-60774&quot;&gt;&lt;del&gt;SERVER-60774&lt;/del&gt;&lt;/a&gt; Early exit in ReshardingOplogFetcher if final op fetched.&lt;/p&gt;

&lt;p&gt;Changes the ReshardingOplogFetcher to return without doing any work when&lt;br/&gt;
the reshardFinalOp entry had already been fetched prior to resuming.&lt;/p&gt;

&lt;p&gt;Also changes ReshardingDonorOplogIterator to throw if it ever sees an&lt;br/&gt;
entry in the local resharding oplog buffer collection after the&lt;br/&gt;
reshardFinalOp entry.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 13093cdb3f878f20e8ebda8ac78f329d1b33a52f)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f8558ce2e556405fed0a22528fe67de6dfcd09dd&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f8558ce2e556405fed0a22528fe67de6dfcd09dd&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4136923" author="xgen-internal-githook" created="Wed, 20 Oct 2021 23:46:59 +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-60774&quot; title=&quot;Resharding may apply through reshardFinalOp without transitioning to strict consistency, stalling write operations on collection being resharded until critical section times out&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-60774&quot;&gt;&lt;del&gt;SERVER-60774&lt;/del&gt;&lt;/a&gt; Early exit in ReshardingOplogFetcher if final op fetched.&lt;/p&gt;

&lt;p&gt;Changes the ReshardingOplogFetcher to return without doing any work when&lt;br/&gt;
the reshardFinalOp entry had already been fetched prior to resuming.&lt;/p&gt;

&lt;p&gt;Also changes ReshardingDonorOplogIterator to throw if it ever sees an&lt;br/&gt;
entry in the local resharding oplog buffer collection after the&lt;br/&gt;
reshardFinalOp entry.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/13093cdb3f878f20e8ebda8ac78f329d1b33a52f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/13093cdb3f878f20e8ebda8ac78f329d1b33a52f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4134033" author="max.hirschhorn@10gen.com" created="Wed, 20 Oct 2021 02:24:33 +0000"  >&lt;p&gt;Reopened because my changes above don&apos;t handle how after the ReshardingOplogFetcher has inserted the reshardFinalOp, upon resuming, it won&apos;t ever know to exit. I&apos;ll type up the changes to switch to have getOplogFetcherResumeId() detect whether the reshardFinalOp has already been inserted so the ReshardingOplogFetcher can know there&apos;s no work left for it to do.&lt;/p&gt;</comment>
                            <comment id="4131959" author="xgen-internal-githook" created="Tue, 19 Oct 2021 12:29:18 +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-60774&quot; title=&quot;Resharding may apply through reshardFinalOp without transitioning to strict consistency, stalling write operations on collection being resharded until critical section times out&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-60774&quot;&gt;&lt;del&gt;SERVER-60774&lt;/del&gt;&lt;/a&gt; Check every op in ReshardingDonorOplogIterator for final.&lt;/p&gt;

&lt;p&gt;Changes the ReshardingDonorOplogIterator to not assume the&lt;br/&gt;
reshardFinalOp entry will always be the last document in resharding&apos;s&lt;br/&gt;
oplog buffer collection. The ReshardingOplogFetcher may end up inserting&lt;br/&gt;
no-op reshardProgressMark entries after the reshardFinalOp entry upon&lt;br/&gt;
resuming from a primary failover.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit d3b36587bc2222fdefa1c755bb253f78c894496c)&lt;br/&gt;
Branch: v5.1&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b9bd6cbda4b93de67cc20fc2df170e815a59ba22&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b9bd6cbda4b93de67cc20fc2df170e815a59ba22&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4131946" author="xgen-internal-githook" created="Tue, 19 Oct 2021 12:24:26 +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-60774&quot; title=&quot;Resharding may apply through reshardFinalOp without transitioning to strict consistency, stalling write operations on collection being resharded until critical section times out&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-60774&quot;&gt;&lt;del&gt;SERVER-60774&lt;/del&gt;&lt;/a&gt; Check every op in ReshardingDonorOplogIterator for final.&lt;/p&gt;

&lt;p&gt;Changes the ReshardingDonorOplogIterator to not assume the&lt;br/&gt;
reshardFinalOp entry will always be the last document in resharding&apos;s&lt;br/&gt;
oplog buffer collection. The ReshardingOplogFetcher may end up inserting&lt;br/&gt;
no-op reshardProgressMark entries after the reshardFinalOp entry upon&lt;br/&gt;
resuming from a primary failover.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit d3b36587bc2222fdefa1c755bb253f78c894496c)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/00fa692f6a891cd2c370dcd59aa7423327023fd9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/00fa692f6a891cd2c370dcd59aa7423327023fd9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4131124" author="xgen-internal-githook" created="Mon, 18 Oct 2021 23:44:51 +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-60774&quot; title=&quot;Resharding may apply through reshardFinalOp without transitioning to strict consistency, stalling write operations on collection being resharded until critical section times out&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-60774&quot;&gt;&lt;del&gt;SERVER-60774&lt;/del&gt;&lt;/a&gt; Check every op in ReshardingDonorOplogIterator for final.&lt;/p&gt;

&lt;p&gt;Changes the ReshardingDonorOplogIterator to not assume the&lt;br/&gt;
reshardFinalOp entry will always be the last document in resharding&apos;s&lt;br/&gt;
oplog buffer collection. The ReshardingOplogFetcher may end up inserting&lt;br/&gt;
no-op reshardProgressMark entries after the reshardFinalOp entry upon&lt;br/&gt;
resuming from a primary failover.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d3b36587bc2222fdefa1c755bb253f78c894496c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d3b36587bc2222fdefa1c755bb253f78c894496c&lt;/a&gt;&lt;/p&gt;</comment>
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