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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-25818] Network timeout on Shard lead to 2 primarys</title>
                <link>https://jira.mongodb.org/browse/SERVER-25818</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;A network error lead to continuous elections for a few hours until the Shard finally broke. The main problem can be seen in the following log:&lt;/p&gt;</description>
                <environment></environment>
        <key id="312019">SERVER-25818</key>
            <summary>Network timeout on Shard lead to 2 primarys</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="kelsey.schubert@mongodb.com">Kelsey Schubert</assignee>
                                    <reporter username="stefan.stark@qplix.com">Stefan Stark</reporter>
                        <labels>
                    </labels>
                <created>Fri, 26 Aug 2016 12:15:35 +0000</created>
                <updated>Fri, 26 Aug 2016 17:57:51 +0000</updated>
                            <resolved>Fri, 26 Aug 2016 17:57:51 +0000</resolved>
                                    <version>3.2.8</version>
                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1369334" author="thomas.schubert" created="Fri, 26 Aug 2016 17:57:51 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=stefan.stark%40qplix.com&quot; class=&quot;user-hover&quot; rel=&quot;stefan.stark@qplix.com&quot;&gt;stefan.stark@qplix.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for reporting this issue. After examining the logs, the behavior that you observe is expected given the network conditions. I see that &lt;tt&gt;Cluster01_Shard0_Primary&lt;/tt&gt; repeatedly loses its connection to the rest of the replica set. As a result, it must step down and then call for a priority takeover when it reconnects. To resolve this issue, I would recommend investigating the cause of the network errors. In the interim, you can set the two nodes to same priority, which will prevent elections from continually occurring.&lt;/p&gt;

&lt;p&gt;For MongoDB-related support discussion please post on the &lt;a href=&quot;http://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-users group&lt;/a&gt; or &lt;a href=&quot;http://stackoverflow.com/questions/tagged/mongodb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Stack Overflow with the &lt;tt&gt;mongodb&lt;/tt&gt; tag&lt;/a&gt;. A question like this involving more discussion would be best posted on the mongodb-users group.&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
                            <comment id="1368947" author="ramon.fernandez" created="Fri, 26 Aug 2016 13:11:26 +0000"  >&lt;p&gt;Sorry you&apos;ve run into this issue &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=stefan.stark%40qplix.com&quot; class=&quot;user-hover&quot; rel=&quot;stefan.stark@qplix.com&quot;&gt;stefan.stark@qplix.com&lt;/a&gt;, and thanks for uploading the logs &amp;#8211; we&apos;ll investigate.&lt;/p&gt;</comment>
                            <comment id="1368895" author="stefan.stark@qplix.com" created="Fri, 26 Aug 2016 12:22:18 +0000"  >&lt;p&gt;Accidently saved ticket to early. More info:&lt;/p&gt;

&lt;p&gt;Primary and Secondary mongod clients lose sight of each other, both get elected to be primary. Once the network is restored the keep stepping down:&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;2016-08-26T03:57:50.121+0200 I REPL     [ReplicationExecutor] Error in heartbeat request to qpx-r1s4.qplix.com:27120; ExceededTimeLimit: Operation timed out&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;2016-08-26T03:57:50.121+0200 I REPL     [ReplicationExecutor] 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;2016-08-26T03:57:50.123+0200 I REPL     [ReplicationExecutor] not electing self, qpx-r2s1.qplix.com:27120 would veto with &apos;qpx-r1s5.qplix.com:27120 is trying to elect itself but qpx-r1s4.qplix.com:27120 is already primary and more up-to-date&apos;&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;2016-08-26T03:57:50.123+0200 I REPL     [ReplicationExecutor] not electing self, we are not freshest&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;2016-08-26T03:57:50.337+0200 I REPL     [ReplicationExecutor] could not find member to sync from&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;2016-08-26T03:57:50.339+0200 I REPL     [ReplicationExecutor] 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;2016-08-26T03:57:50.341+0200 I REPL     [ReplicationExecutor] running for election&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;2016-08-26T03:57:50.342+0200 I REPL     [ReplicationExecutor] received vote: 1 votes from qpx-r2s1.qplix.com:27120&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;2016-08-26T03:57:50.342+0200 I REPL     [ReplicationExecutor] election succeeded, assuming primary role&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;   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;2016-08-26T03:57:50.342+0200 I REPL     [ReplicationExecutor] transition to PRIMARY&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;

&lt;p&gt;OS: Windows Server 2012&lt;br/&gt;
All instances run on different Servers&lt;br/&gt;
All instances run on mongodb 3.2.8&lt;br/&gt;
All instances use the same config template (See attachments)&lt;br/&gt;
I added log files for the first 5-10 minutes, although the problem occured for a few hours. In the end a rollback opperation failed and killed the shard.&lt;/p&gt;</comment>
                    </comments>
                    <attachments>
                            <attachment id="136606" name="Cluster01_Shard0_Backup.txt" size="44701" author="stefan.stark@qplix.com" created="Fri, 26 Aug 2016 12:15:35 +0000"/>
                            <attachment id="136607" name="Cluster01_Shard0_ExampleMongodConfig.txt" size="688" author="stefan.stark@qplix.com" created="Fri, 26 Aug 2016 12:15:35 +0000"/>
                            <attachment id="136608" name="Cluster01_Shard0_Primary.txt" size="210083" author="stefan.stark@qplix.com" created="Fri, 26 Aug 2016 12:15:35 +0000"/>
                            <attachment id="136610" name="Cluster01_Shard0_Secondary.txt" size="126656" author="stefan.stark@qplix.com" created="Fri, 26 Aug 2016 12:15:35 +0000"/>
                            <attachment id="136609" name="Cluster01_Shard0_rsConfig.txt" size="2025" author="stefan.stark@qplix.com" created="Fri, 26 Aug 2016 12:15:35 +0000"/>
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