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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-46516] Majority write concern is blocked by dropping snapshot on reconfig</title>
                <link>https://jira.mongodb.org/browse/SERVER-46516</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;On reconfig, the primary drops all snapshots used to serve majority reads since the quorum may change by reconfig. The &lt;tt&gt;_currentCommittedSnapshot&lt;/tt&gt;&#160;should be recalculated very soon, after a round of heartbeats in the worst case. However it&apos;s not the case. Majority writes are blocked until they are interrupted.&lt;/p&gt;

&lt;p&gt;We need to confirm that the &lt;tt&gt;_currentCommittedSnapshot&lt;/tt&gt; is updated correctly after dropping snapshots and the waiters are signaled correctly.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1210361">SERVER-46516</key>
            <summary>Majority write concern is blocked by dropping snapshot on reconfig</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="siyuan.zhou@mongodb.com">Siyuan Zhou</reporter>
                        <labels>
                            <label>safe-reconfig-related</label>
                    </labels>
                <created>Sun, 1 Mar 2020 20:40:45 +0000</created>
                <updated>Tue, 6 Dec 2022 02:34:28 +0000</updated>
                            <resolved>Mon, 8 Feb 2021 19:56:29 +0000</resolved>
                                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="3605299" author="steven.vannelli" created="Mon, 8 Feb 2021 19:56:29 +0000"  >&lt;p&gt;Since we are doing &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54389&quot; title=&quot;Audit internal uses of force reconfig and consider using safe reconfig&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54389&quot;&gt;&lt;del&gt;SERVER-54389&lt;/del&gt;&lt;/a&gt;, we decided we do not need this one. &lt;/p&gt;</comment>
                            <comment id="3602277" author="pavithra.vetriselvan" created="Fri, 5 Feb 2021 18:58:15 +0000"  >&lt;p&gt;Re-opening this ticket because &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47142&quot; title=&quot;Check primary before writing replset config and no-op&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47142&quot;&gt;&lt;del&gt;SERVER-47142&lt;/del&gt;&lt;/a&gt; does not ensure internal callers of doReplSetReconfig do the no-op write if they use &quot;force&quot;. Please see the attached repro for idempotency issues with setFCV when adding a force reconfig to the upgrade/downgrade procedure.&lt;/p&gt;

&lt;p&gt;We should revisit our contract when dropping snapshots and the assumptions we can make based off of that.  &lt;/p&gt;</comment>
                            <comment id="3013518" author="tess.avitabile" created="Mon, 30 Mar 2020 18:16:36 +0000"  >&lt;p&gt;Closing in favor of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47142&quot; title=&quot;Check primary before writing replset config and no-op&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47142&quot;&gt;&lt;del&gt;SERVER-47142&lt;/del&gt;&lt;/a&gt;. That ticket is going to do the noop write in the same storage transaction as writing the local config document and check whether the node is still primary before doing the write. This will happen is the doReplSetReconfig function, which ensures internal callers of this function do the noop write.&lt;/p&gt;</comment>
                            <comment id="3002072" author="tess.avitabile" created="Thu, 26 Mar 2020 12:54:41 +0000"  >&lt;p&gt;Sure, I can move the noop write to doReplSetReconfig in order to address the TODO in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46345&quot; title=&quot;Remove &amp;#39;newlyAdded&amp;#39; field on heartbeats indicating a node left initial sync&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46345&quot;&gt;&lt;del&gt;SERVER-46345&lt;/del&gt;&lt;/a&gt;. I would like to do this on the master branch only, so as not to destabilize 4.4, since there is no bug. I won&apos;t bother to remove the workaround for FCV downgrade from master, since that will be removed by the Upgrade/Downgrade project. I&apos;ll also leave in the code to not drop snapshots if only the config version/term changed.&lt;/p&gt;

&lt;p&gt;_dropAllSnapshots_inlock is also called after&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/22eacd7b23b61850488dfdf5760d240725da5b79/src/mongo/db/repl/replication_coordinator_impl.cpp#L3788&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;rollback&lt;/a&gt; and when we drop replicated databases in &lt;a href=&quot;https://github.com/mongodb/mongo/blob/22eacd7b23b61850488dfdf5760d240725da5b79/src/mongo/db/repl/initial_syncer.cpp#L802&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;initial sync&lt;/a&gt;. The call after rollback is no longer needed, but it hasn&apos;t caused a problem that I&apos;m aware of. I think there&apos;s a larger problem that our language about snapshots is confusing. I proposed that in the pain point spreadsheet for cleanup.&lt;/p&gt;

&lt;p&gt;That&apos;s correct that we don&apos;t update _currentCommittedSnapshot on journal flush when running with journaling disabled, but we will still update it due to replSetUpdatePosition due to the noop write.&lt;/p&gt;</comment>
                            <comment id="3000251" author="siyuan.zhou@10gen.com" created="Wed, 25 Mar 2020 21:39:43 +0000"  >&lt;p&gt;Thanks &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=tess.avitabile&quot; class=&quot;user-hover&quot; rel=&quot;tess.avitabile&quot;&gt;tess.avitabile&lt;/a&gt; for the detailed investigation! I&apos;d propose to move the no-op write to doReplSetReconfig to make the behavior consistent.&lt;/p&gt;

&lt;p&gt;I&apos;m wondering if this is a more general problem since &lt;tt&gt;_dropAllSnapshots_inlock&lt;/tt&gt; is also called in other places. Another question is when &lt;tt&gt;_rsConfig.getWriteConcernMajorityShouldJournal()&lt;/tt&gt; is false, we &lt;a href=&quot;https://github.com/mongodb/mongo/blob/5f3e1db10472fcd57615424c10372444a2c8427f/src/mongo/db/repl/replication_coordinator_impl.cpp#L1343&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;don&apos;t update&#160;_currentCommittedSnapshot&lt;/a&gt; on journal flush.&lt;/p&gt;</comment>
                            <comment id="3000168" author="judah.schvimer" created="Wed, 25 Mar 2020 21:01:50 +0000"  >&lt;p&gt;There will be a third caller soon for removing &apos;newlyAdded&apos; fields for ISS in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46345&quot; title=&quot;Remove &amp;#39;newlyAdded&amp;#39; field on heartbeats indicating a node left initial sync&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46345&quot;&gt;&lt;del&gt;SERVER-46345&lt;/del&gt;&lt;/a&gt;. I actually added a TODO in that patch referencing this ticket. While I agree this isn&apos;t a bug, it does lead to some testing difficulties.&lt;/p&gt;</comment>
                            <comment id="3000001" author="tess.avitabile" created="Wed, 25 Mar 2020 20:18:49 +0000"  >&lt;p&gt;I found the root cause for this issue, and it only affects internal callers of &lt;tt&gt;ReplicationCoordinator::doReplSetReconfig()&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;&lt;tt&gt;_currentCommittedSnapshot&lt;/tt&gt; gets updated in two ways:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;By the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/81885344c49450f1618d056543ff35a05440324e/src/mongo/db/storage/wiredtiger/wiredtiger_session_cache.cpp#L365&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;JournalFlusher thread&lt;/a&gt;, when the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/81885344c49450f1618d056543ff35a05440324e/src/mongo/db/repl/replication_coordinator_impl.cpp#L1268&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;durable optime advances.&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;By &lt;a href=&quot;https://github.com/mongodb/mongo/blob/81885344c49450f1618d056543ff35a05440324e/src/mongo/db/repl/replication_coordinator_impl.cpp#L4260&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;replSetUpdatePosition.&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;It is not updated by heartbeats. When the &lt;tt&gt;replSetReconfig&lt;/tt&gt; command is run, after we drop snapshots, the command &lt;a href=&quot;https://github.com/mongodb/mongo/blob/81885344c49450f1618d056543ff35a05440324e/src/mongo/db/repl/repl_set_commands.cpp#L430&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;writes a noop oplog entry&lt;/a&gt;. This triggers a round of &lt;tt&gt;replSetUpdatePosition&lt;/tt&gt; commands, which restores the &lt;tt&gt;_currentCommittedSnapshot&lt;/tt&gt;. However, when &lt;tt&gt;doReplSetReconfig()&lt;/tt&gt; is called internally, no oplog entry is written, so &lt;tt&gt;_currentCommittedSnapshot&lt;/tt&gt; is unset until the next write.&lt;/p&gt;

&lt;p&gt;I don&apos;t believe this leads to any bugs. &lt;tt&gt;doReplSetReconfig()&lt;/tt&gt; only has two internal callers:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;&lt;tt&gt;setFeatureCompatibilityVersion&lt;/tt&gt; &lt;a href=&quot;https://github.com/mongodb/mongo/blob/81885344c49450f1618d056543ff35a05440324e/src/mongo/db/commands/set_feature_compatibility_version_command.cpp#L293&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;calls &lt;tt&gt;doReplSetReconfig()&lt;/tt&gt;&lt;/a&gt;, but it works around the issue of dropping snapshots by &lt;a href=&quot;https://github.com/mongodb/mongo/blob/81885344c49450f1618d056543ff35a05440324e/src/mongo/db/commands/set_feature_compatibility_version_command.cpp#L163&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;using an internal &lt;tt&gt;writeConcern&lt;/tt&gt; value that does not wait for &lt;tt&gt;_currentCommittedSnapshot&lt;/tt&gt;&lt;/a&gt;.&lt;/li&gt;
	&lt;li&gt;Step-up &lt;a href=&quot;https://github.com/mongodb/mongo/blob/81885344c49450f1618d056543ff35a05440324e/src/mongo/db/repl/replication_coordinator_impl.cpp#L1148&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;calls &lt;tt&gt;doReplSetReconfig()&lt;/tt&gt;&lt;/a&gt;, but it works around the issue by &lt;a href=&quot;https://github.com/mongodb/mongo/blob/81885344c49450f1618d056543ff35a05440324e/src/mongo/db/repl/replication_coordinator_impl.cpp#L3453&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;not dropping snapshots&lt;/a&gt; since only the config term changed.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Since there is no bug, I&apos;m inclined to close this issue as Gone Away.&#160;Now that we understand the issue, we could file a ticket for code clean-up to change how we do the workarounds. &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=siyuan.zhou&quot; class=&quot;user-hover&quot; rel=&quot;siyuan.zhou&quot;&gt;siyuan.zhou&lt;/a&gt;, how does that sound to you?&lt;/p&gt;</comment>
                            <comment id="2999049" author="tess.avitabile" created="Wed, 25 Mar 2020 18:42:58 +0000"  >&lt;p&gt;I can reproduce this issue with the following diff. The reconfig in the test is to ensure that the config term gets initialized, so that downgrading FCV needs to remove the config term. (See &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47119&quot; title=&quot;Config term does not get initialized until replSetReconfig is run&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47119&quot;&gt;&lt;del&gt;SERVER-47119&lt;/del&gt;&lt;/a&gt; for why this requires running replSetReconfig.)&lt;/p&gt;

&lt;p/&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;--- a/jstests/core/txns/await_prepared_transactions_on_FCV_downgrade.js&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;+++ b/jstests/core/txns/await_prepared_transactions_on_FCV_downgrade.js&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;@@ -19,6 +19,14 @@ assert.commandWorked(testDB.runCommand({create: collName, writeConcern: {w: &quot;maj&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; const session = testDB.getMongo().startSession();&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; const sessionDB = session.getDatabase(dbName);&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;+var config = testDB.adminCommand({replSetGetConfig: 1}).config;&lt;/span&gt;&lt;/pre&gt;
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		&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;/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; try {&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;     jsTestLog(&quot;Start a transaction.&quot;);&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;     session.startTransaction();&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;diff --git a/src/mongo/db/commands/set_feature_compatibility_version_command.cpp b/src/mongo/db/commands/set_feature_compatibility_version_command.cpp&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;index efe1c054aa..8927668f21 100644&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;--- a/src/mongo/db/commands/set_feature_compatibility_version_command.cpp&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;+++ b/src/mongo/db/commands/set_feature_compatibility_version_command.cpp&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;@@ -160,9 +160,8 @@ public:&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;             auto waitForWCStatus = waitForWriteConcern(&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;                 opCtx,&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;                 repl::ReplClientInfo::forClient(opCtx-&amp;gt;getClient()).getLastOp(),&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;-                WriteConcernOptions(repl::ReplSetConfig::kMajorityWriteConcernModeName,&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;-                                    WriteConcernOptions::SyncMode::UNSET,&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;-                                    timeout),&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;+                WriteConcernOptions(&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;+                    WriteConcernOptions::kMajority, WriteConcernOptions::SyncMode::UNSET, timeout),&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;                 &amp;amp;res);&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;             CommandHelpers::appendCommandWCStatus(result, waitForWCStatus, res);&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;/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;diff --git a/src/mongo/db/repl/replication_coordinator_impl.cpp b/src/mongo/db/repl/replication_coordinator_impl.cpp&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;index e9eb073f8e..aabf5743d8 100644&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;--- a/src/mongo/db/repl/replication_coordinator_impl.cpp&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;+++ b/src/mongo/db/repl/replication_coordinator_impl.cpp&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;@@ -3447,12 +3448,12 @@ void ReplicationCoordinatorImpl::_finishReplSetReconfig(OperationContext* opCtx,&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;/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;     // If the new config has the same content but different version and term, skip it, since&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;     // the quorum condition is still the same.&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;-    auto newConfigCopy = newConfig;&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;+    /*auto newConfigCopy = newConfig;&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;     newConfigCopy.setConfigTerm(oldConfig.getConfigTerm());&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;     newConfigCopy.setConfigVersion(oldConfig.getConfigVersion());&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;-    if (SimpleBSONObjComparator::kInstance.evaluate(oldConfig.toBSON() != newConfigCopy.toBSON())) {&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;+    if (SimpleBSONObjComparator::kInstance.evaluate(oldConfig.toBSON() != newConfigCopy.toBSON())) {*/&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;         _dropAllSnapshots_inlock();&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;/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;/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;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
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&lt;p/&gt;</comment>
                            <comment id="2996139" author="tess.avitabile" created="Wed, 25 Mar 2020 15:12:52 +0000"  >&lt;p&gt;Ah, my guess is that it&apos;s because we don&apos;t need to do a reconfig on downgrade FCV if the term is uninitialized, and &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46571&quot; title=&quot;Shard server replica set nodes shouldn&amp;#39;t write config &amp;#39;term&amp;#39; field on startup in FCV 4.2&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46571&quot;&gt;&lt;del&gt;SERVER-46571&lt;/del&gt;&lt;/a&gt; makes the initial replica set config have uninitialized term. So I expect the underlying problem still exists.&lt;/p&gt;</comment>
                            <comment id="2996113" author="tess.avitabile" created="Wed, 25 Mar 2020 15:04:20 +0000"  >&lt;p&gt;The issue was resolved by&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46571&quot; title=&quot;Shard server replica set nodes shouldn&amp;#39;t write config &amp;#39;term&amp;#39; field on startup in FCV 4.2&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46571&quot;&gt;&lt;del&gt;SERVER-46571&lt;/del&gt;&lt;/a&gt;. I will look into why.&lt;/p&gt;</comment>
                            <comment id="2996031" author="tess.avitabile" created="Wed, 25 Mar 2020 14:32:06 +0000"  >&lt;p&gt;Oddly, making the change in the Steps to Reproduce on the tip of master does not reproduce the bug, but if I reset back to &lt;a href=&quot;https://github.com/mongodb/mongo/commit/f3c6ff922842d56abb15a39e64a27fc6ae087298&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this commit&lt;/a&gt; then make the change, the problem does reproduce. &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=siyuan.zhou&quot; class=&quot;user-hover&quot; rel=&quot;siyuan.zhou&quot;&gt;siyuan.zhou&lt;/a&gt;, do you know of any commits in the meantime that might have affected this behavior?&lt;/p&gt;</comment>
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