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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-12516] Multi-updates may fail to detect replica set primary step-down, leading to inconsistency.</title>
                <link>https://jira.mongodb.org/browse/SERVER-12516</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If the primary steps down while in the middle of a multi-update, the operation may continue to update documents until it first attempts to log the op to the oplog.  At that point, the logOp() will fail, but the database is inconsistent.  The database will contain the last update, but it won&apos;t appear in the oplog, and so will not replicate.  It also won&apos;t get rolled back when the new primary takes writes, because there&apos;s no trace of it in the oplog.&lt;/p&gt;

&lt;p&gt;A minimal option would be to make the current massert() on this condition an fassert(), to eliminate corruption.&lt;/p&gt;

&lt;p&gt;Later, it will be necessary to audit all insert, update and remove paths (legacy and write command) to ensure that they validate primary-ness after recovering from yields.&lt;/p&gt;</description>
                <environment></environment>
        <key id="108078">SERVER-12516</key>
            <summary>Multi-updates may fail to detect replica set primary step-down, leading to inconsistency.</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="9">Done</resolution>
                                        <assignee username="schwerin@mongodb.com">Andy Schwerin</assignee>
                                    <reporter username="schwerin@mongodb.com">Andy Schwerin</reporter>
                        <labels>
                    </labels>
                <created>Tue, 28 Jan 2014 22:46:05 +0000</created>
                <updated>Mon, 11 Jul 2016 17:18:48 +0000</updated>
                            <resolved>Wed, 19 Feb 2014 19:58:27 +0000</resolved>
                                    <version>2.4.9</version>
                    <version>2.5.5</version>
                                    <fixVersion>2.6.0-rc0</fixVersion>
                                    <component>Replication</component>
                    <component>Write Ops</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="501777" author="xgen-internal-githook" created="Wed, 19 Feb 2014 19:59:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;andy10gen&apos;, u&apos;name&apos;: u&apos;Andy Schwerin&apos;, u&apos;email&apos;: u&apos;schwerin@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12516&quot; title=&quot;Multi-updates may fail to detect replica set primary step-down, leading to inconsistency.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12516&quot;&gt;&lt;del&gt;SERVER-12516&lt;/del&gt;&lt;/a&gt; Update assert code.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1954504cacb580e06ab20742edf1f3a3c72f75fb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1954504cacb580e06ab20742edf1f3a3c72f75fb&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="501774" author="xgen-internal-githook" created="Wed, 19 Feb 2014 19:57:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;andy10gen&apos;, u&apos;name&apos;: u&apos;Andy Schwerin&apos;, u&apos;email&apos;: u&apos;schwerin@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12516&quot; title=&quot;Multi-updates may fail to detect replica set primary step-down, leading to inconsistency.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12516&quot;&gt;&lt;del&gt;SERVER-12516&lt;/del&gt;&lt;/a&gt; Check for change in primary state when recovering from yield in CRUD operations.&lt;/p&gt;

&lt;p&gt;Without this patch, a replicaset member running a long-running write operation&lt;br/&gt;
that yields might not notice, on yield recovery, that the node is no longer a&lt;br/&gt;
primary, and so no longer entitled to perform writes.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/548693879eddfe3051a7303245dcfedde3a0ac61&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/548693879eddfe3051a7303245dcfedde3a0ac61&lt;/a&gt;&lt;/p&gt;</comment>
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                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="111134">SERVER-12749</issuekey>
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                            <customfieldvalue>&lt;p&gt;Start up a 2-node replica set.  Connect a shell, with legacy write operations or write commands.&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: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;for (i = 0; i &amp;lt; 100 * 1000; ++i) { db.foo.insert({_id: i, a: 1}) }&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;db.getLastError();&lt;/span&gt;&lt;/pre&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-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;db.foo.update({}, {$inc: { a: 5 }}, false, true);  // multi-update&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;From another shell, immediately run&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;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;   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;db.adminCommand({replSetStepDown: 30, force: true})&lt;/span&gt;&lt;/pre&gt;
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&lt;/table&gt;
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&lt;p/&gt;

&lt;p&gt;Notice in the log on the primary a stack trace and the following message&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;   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;Assertion: 13312:replSet error : logOp() but not primary?&lt;/span&gt;&lt;/pre&gt;
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