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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-26701] MongoS stalls when it cannot access one of the CSRS server</title>
                <link>https://jira.mongodb.org/browse/SERVER-26701</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Running a sharded cluster using MongoDb3.2.5 with WiredTiger and of late, mongos on some machine just stalls when it cannot access one of the CSRS server.&lt;/p&gt;

&lt;p&gt;CSRS is a 3 node replicaset and only a couple of mongos processes get stuck in this scenario - we can ignore the reason for one CSRS server not being available for this particular problem&lt;/p&gt;

&lt;p&gt;Here is the mogos log snippet when this happened - the mongos tried to switch the order of the CSRS servers and then after a couple of attempts, it just hung. Any queries using that mongos process would not return.&lt;/p&gt;

&lt;p/&gt;
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&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;2016-10-19T09:02:30.381-0400 I SHARDING [Balancer] distributed lock &apos;balancer&apos; acquired for &apos;doing balance round&apos;, ts : 58076ee6087c1d793ad3b986&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;2016-10-19T09:02:32.657-0400 I SHARDING [Balancer] distributed lock with ts: 58076ee6087c1d793ad3b986&apos; unlocked.&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;2016-10-19T09:03:47.065-0400 I SHARDING [Balancer] distributed lock &apos;balancer&apos; acquired for &apos;doing balance round&apos;, ts : 58076f33087c1d793ad3b98d&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;2016-10-19T09:03:49.341-0400 I SHARDING [Balancer] distributed lock with ts: 58076f33087c1d793ad3b98d&apos; unlocked.&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;2016-10-19T09:05:28.947-0400 I NETWORK  [ReplicaSetMonitorWatcher] changing hosts to csReplSet/mongoconfigserver1:29102,mongoconfigserver3:29102,mongoconfigserver2:29102 from csReplSet/mongoconfigserver1:29102,mongoconfigserver2:29102&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;2016-10-19T09:05:28.947-0400 I SHARDING [ReplicaSetMonitorWatcher] Updating config server connection string to: csReplSet/mongoconfigserver1:29102,mongoconfigserver3:29102,mongoconfigserver2:29102&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;2016-10-19T09:05:28.947-0400 I SHARDING [ReplicaSetMonitorWatcher] Updating ShardRegistry connection string for shard config from: csReplSet/mongoconfigserver1:29102,mongoconfigserver2:29102 to: csReplSet/mongoconfigserver1:29102,mongoconfigserver3:29102,mongoconfigserver2:29102&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;2016-10-19T09:06:15.520-0400 W SHARDING [Balancer] ExceededTimeLimit: Couldn&apos;t get a connection within the time limit&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="325251">SERVER-26701</key>
            <summary>MongoS stalls when it cannot access one of the CSRS server</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="darshan.shah@interactivedata.com">Darshan Shah</reporter>
                        <labels>
                    </labels>
                <created>Wed, 19 Oct 2016 19:14:55 +0000</created>
                <updated>Wed, 14 Dec 2016 17:06:26 +0000</updated>
                            <resolved>Wed, 14 Dec 2016 17:06:26 +0000</resolved>
                                    <version>3.2.5</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1458059" author="thomas.schubert" created="Wed, 14 Dec 2016 17:06:18 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=darshan.shah%40interactivedata.com&quot; class=&quot;user-hover&quot; rel=&quot;darshan.shah@interactivedata.com&quot;&gt;darshan.shah@interactivedata.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Since we have identified a glibc bug in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26723&quot; title=&quot;Mongos stalls for even simple queries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26723&quot;&gt;&lt;del&gt;SERVER-26723&lt;/del&gt;&lt;/a&gt;, which likely explains this issue as well I will be closing this as a duplicate. If you experience this issue after ensuring that you are longer affected by this bug, please let us know and we will continue to investigate.&lt;/p&gt;

&lt;p&gt;Thank you,&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
                            <comment id="1423795" author="darshan.shah@interactivedata.com" created="Wed, 2 Nov 2016 12:37:23 +0000"  >&lt;p&gt;This looks similar as the symptoms are the same - MongoS is stalled.&lt;br/&gt;
However, in this case, it is confirmed that the config server was definitely not reachable.&lt;br/&gt;
In case of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26723&quot; title=&quot;Mongos stalls for even simple queries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26723&quot;&gt;&lt;del&gt;SERVER-26723&lt;/del&gt;&lt;/a&gt;, the config server is definitely reachable.&lt;/p&gt;</comment>
                            <comment id="1423783" author="ramon.fernandez" created="Wed, 2 Nov 2016 12:07:20 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=darshan.shah%40interactivedata.com&quot; class=&quot;user-hover&quot; rel=&quot;darshan.shah@interactivedata.com&quot;&gt;darshan.shah@interactivedata.com&lt;/a&gt;, is this the same issue that we&apos;re investigating under &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26723&quot; title=&quot;Mongos stalls for even simple queries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26723&quot;&gt;&lt;del&gt;SERVER-26723&lt;/del&gt;&lt;/a&gt;?&lt;/p&gt;</comment>
                            <comment id="1412937" author="darshan.shah@interactivedata.com" created="Wed, 19 Oct 2016 19:18:33 +0000"  >&lt;p&gt;Note that at the time this occurs, the CSRS node mongoconfigserver2:29102 has the below in its log - showing that it was indeed not reachable at that time:&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;   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;2016-10-19T09:01:10.957-0400 W NETWORK  [ReplicaSetMonitorWatcher] Failed to connect to 10.170.7.16:29102, reason: errno:111 Connection refused&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;2016-10-19T09:01:21.945-0400 W NETWORK  [ReplicaSetMonitorWatcher] Failed to connect to 10.170.7.16:29102, reason: errno:111 Connection refused&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;2016-10-19T09:01:32.933-0400 W NETWORK  [ReplicaSetMonitorWatcher] Failed to connect to 10.170.7.16:29102, reason: errno:111 Connection refused&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;/div&gt;
&lt;p/&gt;</comment>
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                            <issuelinktype id="10010">
                    <name>Duplicate</name>
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                                        <issuelink>
            <issuekey id="325869">SERVER-26723</issuekey>
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