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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-17074] Sharded Replicaset - replicas fall behind (3.0.0-rc6)</title>
                <link>https://jira.mongodb.org/browse/SERVER-17074</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We&apos;re seeing our replicaset not able to keep up with the primary in a peculiar way.  &lt;/p&gt;

&lt;p&gt;Previously we were on 2.6 and the replication worked fine, no changes since then except upgrading to 3.0.0-rc6.&lt;/p&gt;

&lt;p&gt;I see (via mongostat) primaries getting approx. 4k updates/sec each times 8 shards; secondaries show 0 updates/sec.  I stop the replica daemon, wipe the directory, and restart.  The resync starts and executes properly, catching up and going into &apos;SEC&apos; mode on mongostat.  This lasts only several seconds before the updates/sec on SEC goes to 0.  Primary is still 4k updates/sec.  &lt;/p&gt;

&lt;p&gt;Logs on secondaries show lots of these kind of messages:&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;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;2015-01-26T14:02:48.942-0600 I QUERY    [conn193] killcursors  keyUpdates:0 writeConflicts:0 numYields:0 11777ms&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;2015-01-26T14:02:48.942-0600 I QUERY    [conn109] killcursors  keyUpdates:0 writeConflicts:0 numYields:0 11717ms&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;2015-01-26T14:02:48.943-0600 I QUERY    [conn133] killcursors  keyUpdates:0 writeConflicts:0 numYields:0 11702ms&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;2015-01-26T14:02:48.943-0600 I QUERY    [conn206] killcursors  keyUpdates:0 writeConflicts:0 numYields:0 11691ms&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;2015-01-26T14:02:48.943-0600 I QUERY    [conn156] killcursors  keyUpdates:0 writeConflicts:0 numYields:0 11681ms&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;
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			&lt;/td&gt;
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&lt;p/&gt;

&lt;p&gt;I&apos;ve updated several times through rc4, rc5, rc6, and am now even running the nightly, all show the same behavior.  &lt;/p&gt;

&lt;p&gt;Note this is a very write-intensive application.  Data is stored on SSD&apos;s, journals on spinning disk, but I&apos;ve tried moving journals to SSD and it hasn&apos;t helped.&lt;/p&gt;</description>
                <environment>Centos 6</environment>
        <key id="181047">SERVER-17074</key>
            <summary>Sharded Replicaset - replicas fall behind (3.0.0-rc6)</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="justanyone">Kevin J. Rice</reporter>
                        <labels>
                    </labels>
                <created>Tue, 27 Jan 2015 17:20:53 +0000</created>
                <updated>Sat, 9 Jul 2016 21:09:20 +0000</updated>
                            <resolved>Thu, 29 Jan 2015 14:26:43 +0000</resolved>
                                    <version>3.0.0-rc6</version>
                                                    <component>Replication</component>
                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="816387" author="eliot" created="Thu, 29 Jan 2015 14:26:43 +0000"  >&lt;p&gt;I believe this is the same issue as in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16921&quot; title=&quot;WT oplog bottleneck on secondary&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16921&quot;&gt;&lt;del&gt;SERVER-16921&lt;/del&gt;&lt;/a&gt; which was fixed in rc7.&lt;br/&gt;
Please note that to get the full fix you&apos;ll need to resync the wiredtiger node or do a --repair.&lt;br/&gt;
Please let us know if that doesn&apos;t resolve it.&lt;/p&gt;</comment>
                            <comment id="814516" author="justanyone" created="Tue, 27 Jan 2015 17:52:11 +0000"  >&lt;p&gt;I&apos;ve found that I had a bunch of ancillary processes doing many more updates and inserts on this replicaset, connecting via pymongo readpreference nearest.&lt;/p&gt;

&lt;p&gt;When I turned off these other processes, the replicaset caught up.  Note there were not long-runing queries; I ran the standard kill-long-running-queries javascript to killOp() those.  So, it was just a bunch of queries running under 1 minute each.&lt;/p&gt;

&lt;p&gt;So:  revise replication instructions to include many large-volume queries (rp: nearest) pulling back lots of records via a non-shard-key index but issuing shard-key updates, plus querying likewise and inserting new records.&lt;/p&gt;
</comment>
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