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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-11103] replset mutex should be not be held during DB lock attempts</title>
                <link>https://jira.mongodb.org/browse/SERVER-11103</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Result: Elections will not proceed correctly until heartbeats are processed.&lt;/p&gt;

&lt;p&gt;Repro:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;fsyncLock() secondary (XXX:27019)&lt;/li&gt;
	&lt;li&gt;raise the priority for the PRIMARY (XXX:27017) and issue rs.reconfig()&lt;/li&gt;
	&lt;li&gt;shut down the PRIMARY&lt;/li&gt;
	&lt;li&gt;observe that another SECONDARY (XXX:27018) cannot be elected since the fsyncLock&apos;ed one vetoes it:
&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;   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;Wed Oct  9 11:58:21.339 [rsMgr] not electing self, XXX:27019 would veto with &apos;XXX:27018 is trying to elect itself but XXX:27017 is already primary and more up-to-date&apos;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;&lt;/li&gt;
	&lt;li&gt;fsyncUnlock() the SECONDARY ( XXX:27019 ), observe the XXX:27018 being elected&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;Expected behavior:&lt;br/&gt;
Write locks should not prevent an election or delay detecting replica set node state changes. This message is an example:&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;   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;Wed Oct  9 11:51:01.864 [rsHealthPoll] replSet member XXX:27017 is now in state DOWN&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Ideally, XXX:27019 should vote for XXX:27018 (see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-11059&quot; title=&quot;Elections can be delayed by some locks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-11059&quot;&gt;&lt;del&gt;SERVER-11059&lt;/del&gt;&lt;/a&gt;).&lt;/p&gt;</description>
                <environment></environment>
        <key id="93485">SERVER-11103</key>
            <summary>replset mutex should be not be held during DB lock attempts</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="matt.dannenberg">Matt Dannenberg</assignee>
                                    <reporter username="alex.komyagin@mongodb.com">Alexander Komyagin</reporter>
                        <labels>
                            <label>elections</label>
                    </labels>
                <created>Wed, 9 Oct 2013 16:17:00 +0000</created>
                <updated>Mon, 11 Jul 2016 17:39:36 +0000</updated>
                            <resolved>Tue, 28 Oct 2014 18:20:12 +0000</resolved>
                                    <version>2.4.6</version>
                                    <fixVersion>2.8.0-rc0</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="750688" author="xgen-internal-githook" created="Tue, 28 Oct 2014 18:19:46 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dannenberg&apos;, u&apos;name&apos;: u&apos;matt dannenberg&apos;, u&apos;email&apos;: u&apos;matt.dannenberg@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-11103&quot; title=&quot;replset mutex should be not be held during DB lock attempts&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-11103&quot;&gt;&lt;del&gt;SERVER-11103&lt;/del&gt;&lt;/a&gt; test that fsyncLocked secondaries will still participate in elections&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4d8aa08ef8b45a9d62dff13b96b210d30099fa7d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4d8aa08ef8b45a9d62dff13b96b210d30099fa7d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="745696" author="scotthernandez" created="Mon, 20 Oct 2014 20:41:21 +0000"  >&lt;p&gt;This fails to elect primary due to a config version mismatch, as this just repeats:&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;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; m31001| 2014-10-20T15:39:44.764-0400 W NETWORK  Failed to connect to 10.4.100.53:31000 after 5000 milliseconds, giving up.&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; m31002| 2014-10-20T15:39:44.764-0400 W NETWORK  Failed to connect to 10.4.100.53:31000 after 5000 milliseconds, giving up.&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; m31001| 2014-10-20T15:39:44.764-0400 I REPLSETS Standing for election&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; m31001| 2014-10-20T15:39:44.764-0400 I REPLSETS replSet info electSelf&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; m31002| 2014-10-20T15:39:44.765-0400 I REPLSETS replSetElect not voting because our config version is stale. Our version: 1, their version: 2&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; m31001| 2014-10-20T15:39:44.765-0400 I REPLSETS replSet couldn&apos;t elect self, only received 1 votes, but needed at least 2&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;This test is flawed since it blocks writing the new config version which causes the problem of having an old config version for voting. I put up the start of a better test, but haven&apos;t finished... and now &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=mattd%4010gen.com&quot; class=&quot;user-hover&quot; rel=&quot;mattd@10gen.com&quot;&gt;mattd@10gen.com&lt;/a&gt; is taking over &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/smile.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/p&gt;</comment>
                            <comment id="744209" author="milkie" created="Fri, 17 Oct 2014 16:05:44 +0000"  >&lt;p&gt;The code now works as per Expected Behavior in the description above.  However, the provided test still fails because a node is not allowed to reconfig while fsync-and-locked, as per Matt&apos;s comment above.&lt;/p&gt;</comment>
                            <comment id="706708" author="milkie" created="Thu, 28 Aug 2014 14:19:31 +0000"  >&lt;p&gt;We need to confirm the attached jstest succeeds after the refactor is complete.&lt;/p&gt;</comment>
                            <comment id="483371" author="mattd@10gen.com" created="Thu, 16 Jan 2014 21:49:24 +0000"  >&lt;p&gt;I did a bit of digging around and it looks like the problem is that to save the new config (saveConfigLocally in rs_config.cpp) the node needs to acquire a WriteContext on the &quot;local.system.replset&quot; collection, which it cannot get due to being fsync and locked.&lt;/p&gt;</comment>
                            <comment id="440624" author="alex.komyagin@10gen.com" created="Mon, 14 Oct 2013 21:20:20 +0000"  >&lt;p&gt;Attaching jstest that reproduces the issue&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="93040">SERVER-11059</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                                        </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10220">
                    <name>Tested</name>
                                            <outwardlinks description="tested by">
                                                        </outwardlinks>
                                                        </issuelinktype>
                    </issuelinks>
                <attachments>
                            <attachment id="32573" name="block_hearbeat.js" size="1589" author="alex.komyagin@mongodb.com" created="Mon, 14 Oct 2013 21:20:20 +0000"/>
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