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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-15799] Replication threads stuck in infinite connection loop when there is not enough remote oplog</title>
                <link>https://jira.mongodb.org/browse/SERVER-15799</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;One of secondary members of our replica set had to be taken offline for a prolonged period. Unfortunately, the oplog on master was not long enough for a proper recovery. But, instead of getting the usual message in the error log (about oplog too short to recover), the secondary started creating a lot of connections to primary at a rate of about 300 per second, until it exhausted local ports (due to 30K of connections to the same remote port, hanging in TIME_WAIT) and then started losing heartbeats due to inability to connect to primary server at all, filling log with these messages:&lt;/p&gt;
&lt;blockquote&gt;
&lt;p&gt;2014-10-24T17:07:51.063+0400 &lt;span class=&quot;error&quot;&gt;&amp;#91;rsBackgroundSync&amp;#93;&lt;/span&gt; warning: Failed to connect to 10.3.1.12:27032, reason: errno:99 Cannot assign requested address&lt;br/&gt;
2014-10-24T17:07:51.064+0400 &lt;span class=&quot;error&quot;&gt;&amp;#91;rsBackgroundSync&amp;#93;&lt;/span&gt; repl: couldn&apos;t connect to server d1.s2.fs-temp.drive.bru:27032 (10.3.1.12), connection attempt failed&lt;/p&gt;&lt;/blockquote&gt;
</description>
                <environment></environment>
        <key id="165304">SERVER-15799</key>
            <summary>Replication threads stuck in infinite connection loop when there is not enough remote oplog</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="5">Cannot Reproduce</resolution>
                                        <assignee username="matt.dannenberg">Matt Dannenberg</assignee>
                                    <reporter username="onyxmaster">Aristarkh Zagorodnikov</reporter>
                        <labels>
                    </labels>
                <created>Fri, 24 Oct 2014 13:25:56 +0000</created>
                <updated>Tue, 14 Apr 2015 20:59:35 +0000</updated>
                            <resolved>Tue, 14 Apr 2015 20:59:35 +0000</resolved>
                                    <version>2.6.5</version>
                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="881213" author="ramon.fernandez" created="Tue, 14 Apr 2015 20:59:35 +0000"  >&lt;p&gt;Thanks &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=onyxmaster&quot; class=&quot;user-hover&quot; rel=&quot;onyxmaster&quot;&gt;onyxmaster&lt;/a&gt;, closing this ticket now. If this you run into this again please re-open.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
                            <comment id="881207" author="onyxmaster" created="Tue, 14 Apr 2015 20:53:05 +0000"  >&lt;p&gt;Hi!&lt;br/&gt;
Well, we didn&apos;t see this problem in the last few months, so I guess it either got fixed or just doesn&apos;t occur anymore in our environment. I think this case should be closed since there is no stable repro.&lt;/p&gt;</comment>
                            <comment id="881156" author="mattd@10gen.com" created="Tue, 14 Apr 2015 20:15:36 +0000"  >&lt;p&gt;Hey Aristarkh,&lt;/p&gt;

&lt;p&gt;Apologies for the long delay in getting back to you. We were unable to reproduce this behavior on our end: in the scenario you describe the secondary realizes it cannot catch up and does an initial sync. The steps I took for attempting the repro were:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Start a three node set with a small oplog (5MB)&lt;/li&gt;
	&lt;li&gt;Start doing inserts&lt;/li&gt;
	&lt;li&gt;Take down one secondary&lt;/li&gt;
	&lt;li&gt;Do more than enough inserts to overwrite the whole oplog&lt;/li&gt;
	&lt;li&gt;Bring the secondary back up&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;At the point, the secondary noticed it was too far behind and dropped in to recovering and suggests a docs page about fixing it:&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;2015-04-14T10:49:54.517-0400 [rsBackgroundSync] replSet syncing to: dannenstation.local:27017&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;2015-04-14T10:49:54.519-0400 [rsSync] replSet still syncing, not yet to minValid optime 552d2223:33&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;2015-04-14T10:49:54.519-0400 [rsBackgroundSync] replSet remoteOldestOp:    Apr 14 10:20:19 552d2223:33&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;2015-04-14T10:49:54.519-0400 [rsBackgroundSync] replSet lastOpTimeFetched: Apr 14 10:14:47 552d20d7:28&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;2015-04-14T10:49:54.519-0400 [rsBackgroundSync] replSet syncing to: dannenstation.local:27019&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;2015-04-14T10:49:54.521-0400 [rsBackgroundSync] replSet remoteOldestOp:    Apr 14 10:20:19 552d2223:33&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;2015-04-14T10:49:54.522-0400 [rsBackgroundSync] replSet lastOpTimeFetched: Apr 14 10:14:47 552d20d7:28&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;2015-04-14T10:49:54.522-0400 [rsBackgroundSync] replSet error RS102 too stale to catch up, at least from dannenstation.local:27019&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;2015-04-14T10:49:54.522-0400 [rsBackgroundSync] replSet our last optime : Apr 14 10:14:47 552d20d7:28&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;2015-04-14T10:49:54.522-0400 [rsBackgroundSync] replSet oldest at dannenstation.local:27019 : Apr 14 10:20:19 552d2223:33&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;2015-04-14T10:49:54.522-0400 [rsBackgroundSync] replSet See http://dochub.mongodb.org/core/resyncingaverystalereplicasetmember&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;2015-04-14T10:49:54.523-0400 [rsBackgroundSync] replSet error RS102 too stale to catch 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;   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;2015-04-14T10:49:54.523-0400 [rsBackgroundSync] replSet RECOVERING&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;If this is still an issue for you, is there any more information you can provide to successfully reproduce the problem on our end?&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Matt&lt;/p&gt;</comment>
                            <comment id="748442" author="onyxmaster" created="Fri, 24 Oct 2014 14:44:03 +0000"  >&lt;p&gt;Attaching log files. They are large (~880 MB), but I think I&apos;d better won&apos;t filter them so you have more information.&lt;/p&gt;</comment>
                            <comment id="748422" author="ramon.fernandez" created="Fri, 24 Oct 2014 14:15:41 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=onyxmaster&quot; class=&quot;user-hover&quot; rel=&quot;onyxmaster&quot;&gt;onyxmaster&lt;/a&gt;, can you please upload logs for the primary and the affected secondary going at least as far back as a bit before the secondary was taken down?&lt;/p&gt;</comment>
                            <comment id="748394" author="onyxmaster" created="Fri, 24 Oct 2014 13:27:13 +0000"  >&lt;p&gt;Restarting secondary multiple times didn&apos;t help. While I understand that this (short oplog) is an erroneous condition, the handling of it could be more graceful (as it was before).&lt;/p&gt;</comment>
                    </comments>
                    <attachments>
                            <attachment id="55226" name="primary.log.bz2" size="44325814" author="onyxmaster" created="Fri, 24 Oct 2014 14:44:03 +0000"/>
                            <attachment id="55227" name="secondary.log.bz2" size="317332" author="onyxmaster" created="Fri, 24 Oct 2014 14:44:03 +0000"/>
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