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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-32703] Secondary can take a couple minutes to re-establish sync source after network partition</title>
                <link>https://jira.mongodb.org/browse/SERVER-32703</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hi folks,&lt;/p&gt;

&lt;p&gt;I was testing how a 3-nodes cluster of MongoDB behaves (from a client perspective) when one of the nodes is isolated from the cluster and observed an anomaly.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;TL;DR&lt;/b&gt;: When a node is isolated, all clients hang for almost two minutes (unexpected behaviour, too long downtime). A client running on the isolated node continues being down (expected behaviour), but the clients on healthy nodes become unexpectedly slow (RPS drop to less than one operation per second from 282 before the isolation).&lt;/p&gt;

&lt;p&gt;Repo with docker+javascript scripts to reproduce the problem: &lt;a href=&quot;https://github.com/rystsov/perseus/tree/master/mongodb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/rystsov/perseus/tree/master/mongodb&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Testing environment&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;OS: Ubuntu 17.10&lt;br/&gt;
MongoDB: 3.6.1&lt;br/&gt;
NodeJS: v8.9.4&lt;br/&gt;
MongoDB driver: NPM: &quot;mongodb&quot;: 3.0.1&lt;/p&gt;

&lt;p&gt;Three nodes (mongo1, mongo2, mongo3) form a MongoDB cluster running mongod in a single replica set. Besides mongod, each node has a NodeJS app which:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;in a loop reads a value from the cluster, increments it and writes back&lt;/li&gt;
	&lt;li&gt;exposes API to fetch number of successful and failed iterations&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Also there is a fourth node (client1) which fetches the stat and dumps it every second in the following format:&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;   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;#legend: time|mongo1|mongo2|mongo3|mongo1:err|mongo2:err|mongo3:err&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;1	9	21	24	0	0	0	2018/01/14 10:43:02&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;2	28	50	52	0	0	0	2018/01/14 10:43:03&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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-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;3	28	48	43	0	0	0	2018/01/14 10:43:04&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;The first column is the number of passed seconds since the beginning of the experiment; the next three columns contain counter of successful iterations of the clients located on each node per last second, following three columns are counters of errors and the last one is time.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Client (db/remote-tester)&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;Client is a NodeJS app using the following connection URL: mongodb://mongo1,mongo2,mongo3/?replicaSet=rs0&amp;amp;autoReconnect=false&amp;amp;socketTimeoutMS=10000&amp;amp;connectTimeoutMS=10000.&lt;/p&gt;

&lt;p&gt;Each write operation has writeConcern &quot;majority&quot; while each read operation has readConcern &quot;linearizable&quot;.&lt;/p&gt;

&lt;p&gt;When a client runs into a problem it closes the current connection and opens a new one.&lt;/p&gt;

&lt;p&gt;Each client uses a different key to avoid collisions.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Isolation&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;The network isolation is simulated with iptables:&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;
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					&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;iptables -A INPUT -s p.ee.r.ip -j DROP&lt;/span&gt;&lt;/pre&gt;
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					&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;iptables -A OUTPUT -d p.ee.r.ip -j DROP&lt;/span&gt;&lt;/pre&gt;
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			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;During the isolation, the traffic is blocked between mongo1 and (mongo2 &amp;amp; mongo3), but client1 can see all nodes.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Results&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;Let&apos;s take a look on the logs of the aggregating client (client1.log):&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;#legend: time|mongo1|mongo2|mongo3|mongo1:err|mongo2:err|mongo3:err&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;1	9	21	24	0	0	0	2018/01/14 10:43:02&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;2	28	50	52	0	0	0	2018/01/14 10:43:03&lt;/span&gt;&lt;/pre&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;   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;10	25	55	53	0	0	0	2018/01/14 10:43:11&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;11	14	55	60	0	0	0	2018/01/14 10:43:12&lt;/span&gt;&lt;/pre&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;   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;# isolating mongo1&lt;/span&gt;&lt;/pre&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;   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;192	0	0	0	0	0	0	2018/01/14 10:46:14&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;193	0	0	0	0	0	0	2018/01/14 10:46:15&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;   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;194	0	1	1	0	0	0	2018/01/14 10:46:16&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;   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;195	0	0	0	0	0	0	2018/01/14 10:46:17&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;# rejoining mongo1&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;196	0	0	0	0	0	0	2018/01/14 10:46:18&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;# rejoined mongo1&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;197	0	0	0	0	0	0	2018/01/14 10:46:19&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;   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;198	0	1	1	0	0	0	2018/01/14 10:46:20&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;   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;199	0	0	0	0	0	0	2018/01/14 10:46:21&lt;/span&gt;&lt;/pre&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;   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;200	0	0	0	0	0	0	2018/01/14 10:46:22&lt;/span&gt;&lt;/pre&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;   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;201	0	0	0	0	0	0	2018/01/14 10:46:23&lt;/span&gt;&lt;/pre&gt;
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			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;As you can see, clients on mongo1, mongo2, mongo3 stopped doing progress after the isolation. 117 seconds later mongo2 and mongo3 &quot;recovered&quot; but they became very slow.&lt;/p&gt;

&lt;p&gt;When the connection was restored it took 38s until mongo2, mongo3 recovered to their previous pace, but mongo1 remained silent (unexpected behaviour).&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Logs&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;Please see the attached &quot;slow-full.tar.gz&quot; archive for logs.&lt;/p&gt;

&lt;p&gt;&lt;ins&gt;&lt;em&gt;client1.log&lt;/em&gt;&lt;/ins&gt;&lt;/p&gt;

&lt;p&gt;Log of the aggregating client. Its format was described above.&lt;/p&gt;

&lt;p&gt;&lt;ins&gt;&lt;em&gt;mongo(1|2|3).tester.log&lt;/em&gt;&lt;/ins&gt;&lt;/p&gt;

&lt;p&gt;Log of the actual client. In happy case it looks like:&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;2018/01/14 10:43:01	reading(0)&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;	2018/01/14 10:43:01	connecting&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;	2018/01/14 10:43:01	ok&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;2018/01/14 10:43:01	creating(0)&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;2018/01/14 10:43:01	ok(0)&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;2018/01/14 10:43:01	reading(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;2018/01/14 10:43:01	stat&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;2018/01/14 10:43:01	updating(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;   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;2018/01/14 10:43:01	ok(1)&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;Each successful iteration is represented by a sequence of lines (reading, creating|updating, ok). During a connection you&apos;ll see &quot;connecting&quot; and &quot;ok&quot; records. &quot;stat&quot; record corresponds to the fetch request from the aggregating client and helps to understand how long the previous operation hangs.&lt;/p&gt;

&lt;p&gt;If there are errors during the execution, then they also are dumped into this log like:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;&quot;MongoNetworkError: connection 0 to mongo1:27017 timed out&quot;&lt;/li&gt;
	&lt;li&gt;&quot;MongoNetworkError: failed to connect to server mongo3:27017 on first connect&quot;&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;&lt;em&gt;&lt;ins&gt;mongo(1|2|3).log&lt;/ins&gt;&lt;/em&gt;&lt;/p&gt;

&lt;p&gt;Log of the mongod processes.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Why do I think it&apos;s more a bug rather than a misconfiguration?&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;The bug isn&apos;t always reproducible: sometimes the pace of mongo2 and mongo3 doesn&apos;t degrade and when the connection is restored the mongo1&apos;s client starts working. See the attached &quot;good-full.tar.gz&quot;.&lt;/p&gt;

&lt;p&gt;I hope this report will help you!&lt;/p&gt;</description>
                <environment></environment>
        <key id="483027">SERVER-32703</key>
            <summary>Secondary can take a couple minutes to re-establish sync source after network partition</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="evin.roesle@mongodb.com">Evin Roesle</assignee>
                                    <reporter username="rystsov">Denis Rystsov</reporter>
                        <labels>
                    </labels>
                <created>Mon, 15 Jan 2018 09:52:22 +0000</created>
                <updated>Fri, 21 Feb 2020 21:17:26 +0000</updated>
                            <resolved>Fri, 21 Feb 2020 21:17:26 +0000</resolved>
                                    <version>3.6.1</version>
                                                    <component>JavaScript</component>
                    <component>Replication</component>
                                        <votes>4</votes>
                                    <watches>18</watches>
                                                                                                                <comments>
                            <comment id="2889678" author="evin.roesle" created="Fri, 21 Feb 2020 21:17:26 +0000"  >&lt;p&gt;Closing this ticket as we believe this issue has been fixed by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35200&quot; title=&quot;Speed up failure detection in the OplogFetcher during steady state replication&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35200&quot;&gt;&lt;del&gt;SERVER-35200&lt;/del&gt;&lt;/a&gt;. If you believe that this issue is still present, please reopen this ticket.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="1867073" author="spencer" created="Tue, 17 Apr 2018 22:36:16 +0000"  >&lt;p&gt;We already don&apos;t propose a node as a sync source candidate if we believe it to be down: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/e0562dc07a6aaf2993f0236cc443ee9b83b5e522/src/mongo/db/repl/topology_coordinator.cpp#L303&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/e0562dc07a6aaf2993f0236cc443ee9b83b5e522/src/mongo/db/repl/topology_coordinator.cpp#L303&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;The fix that is needed is that there is retry logic built into the OplogFetcher that continues to run even if the consensus system has determined the sync source to be down.&lt;/p&gt;</comment>
                            <comment id="1789819" author="siyuan.zhou@10gen.com" created="Tue, 30 Jan 2018 21:57:12 +0000"  >&lt;p&gt; &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33026&quot; title=&quot;SyncSourceFeedback request doesn&amp;#39;t have a timeout&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33026&quot;&gt;&lt;del&gt;SERVER-33026&lt;/del&gt;&lt;/a&gt; is filed for sync source feedback.&lt;/p&gt;</comment>
                            <comment id="1774633" author="rystsov" created="Tue, 16 Jan 2018 01:05:41 +0000"  >&lt;p&gt;By the way, as host system I used:&lt;br/&gt;
MacOS: 10.13.2&lt;br/&gt;
Docker: 17.12.0-ce&lt;/p&gt;</comment>
                            <comment id="1774632" author="rystsov" created="Tue, 16 Jan 2018 01:03:25 +0000"  >&lt;p&gt;I managed to reproduce the good case:  &lt;span class=&quot;nobr&quot;&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/attachment/175927/175927_good-full.data.tar.gz&quot; title=&quot;good-full.data.tar.gz attached to SERVER-32703&quot;&gt;good-full.data.tar.gz&lt;sup&gt;&lt;img class=&quot;rendericon&quot; src=&quot;https://jira.mongodb.org/images/icons/link_attachment_7.gif&quot; height=&quot;7&quot; width=&quot;7&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/sup&gt;&lt;/a&gt;&lt;/span&gt; &lt;/p&gt;</comment>
                            <comment id="1774628" author="rystsov" created="Tue, 16 Jan 2018 00:45:03 +0000"  >&lt;p&gt;Hi Bruce, I reproduced the &quot;slow&quot; case but the &quot;good&quot; case is more rare so I didn&apos;t managed to catch it, but I&apos;ll keep trying. Please find the logs and the data dir attached. &lt;span class=&quot;nobr&quot;&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/attachment/175926/175926_slow-full.data.tar.gz&quot; title=&quot;slow-full.data.tar.gz attached to SERVER-32703&quot;&gt;slow-full.data.tar.gz&lt;sup&gt;&lt;img class=&quot;rendericon&quot; src=&quot;https://jira.mongodb.org/images/icons/link_attachment_7.gif&quot; height=&quot;7&quot; width=&quot;7&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/sup&gt;&lt;/a&gt;&lt;/span&gt; &lt;/p&gt;</comment>
                            <comment id="1774393" author="bruce.lucas@10gen.com" created="Mon, 15 Jan 2018 15:49:44 +0000"  >&lt;p&gt;Hi Denis,&lt;/p&gt;

&lt;p&gt;Thanks for the detailed report including logs. Would it be possible for you to reproduce the &quot;good&quot; and &quot;slow&quot; cases again and include both logs and the archived content of the $dbpath/diagnostic.data directory from each node? This will give us more detailed information about the internal operation of the server.&lt;/p&gt;

&lt;p&gt;Note: to ensure that all information has been written to diagnostic.data, please shut down all nodes before copying the files.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Bruce&lt;/p&gt;</comment>
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