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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-415] Increasing slave lagging</title>
                <link>https://jira.mongodb.org/browse/SERVER-415</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Just posted a message on the group with a complete description: &lt;a href=&quot;http://groups.google.com/group/mongodb-user/browse_frm/thread/2fd21b8791de910c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://groups.google.com/group/mongodb-user/browse_frm/thread/2fd21b8791de910c&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Basically, we&apos;re witnessing increasing lag, up to 30 hours on our slaves, with no particular reason (no heavy concurrent updates, not much reading, etc ...)&lt;/p&gt;

&lt;p&gt;Trying to upgrade to a bigger hardware platform, but data migration is a very big issue for us ...&lt;/p&gt;</description>
                <environment>processor       : 0&lt;br/&gt;
vendor_id       : AuthenticAMD&lt;br/&gt;
cpu family      : 15&lt;br/&gt;
model           : 33&lt;br/&gt;
model name      : Dual Core AMD Opteron(tm) Processor 270&lt;br/&gt;
stepping        : 2&lt;br/&gt;
cpu MHz         : 2004.542&lt;br/&gt;
cache size      : 1024 KB&lt;br/&gt;
physical id     : 0&lt;br/&gt;
siblings        : 1&lt;br/&gt;
core id         : 0&lt;br/&gt;
cpu cores       : 1&lt;br/&gt;
fpu             : yes&lt;br/&gt;
fpu_exception   : yes&lt;br/&gt;
cpuid level     : 1&lt;br/&gt;
wp              : yes&lt;br/&gt;
flags           : fpu tsc msr pae mce cx8 apic mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt lm 3dnowext 3dnow pni lahf_lm cmp_legacy&lt;br/&gt;
bogomips        : 4011.50&lt;br/&gt;
TLB size        : 1024 4K pages&lt;br/&gt;
clflush size    : 64&lt;br/&gt;
cache_alignment : 64&lt;br/&gt;
address sizes   : 40 bits physical, 48 bits virtual&lt;br/&gt;
power management: ts fid vid ttp&lt;br/&gt;
&lt;br/&gt;
processor       : 1&lt;br/&gt;
vendor_id       : AuthenticAMD&lt;br/&gt;
cpu family      : 15&lt;br/&gt;
model           : 33&lt;br/&gt;
model name      : Dual Core AMD Opteron(tm) Processor 270&lt;br/&gt;
stepping        : 2&lt;br/&gt;
cpu MHz         : 2004.542&lt;br/&gt;
cache size      : 1024 KB&lt;br/&gt;
physical id     : 1&lt;br/&gt;
siblings        : 1&lt;br/&gt;
core id         : 0&lt;br/&gt;
cpu cores       : 1&lt;br/&gt;
fpu             : yes&lt;br/&gt;
fpu_exception   : yes&lt;br/&gt;
cpuid level     : 1&lt;br/&gt;
wp              : yes&lt;br/&gt;
flags           : fpu tsc msr pae mce cx8 apic mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt lm 3dnowext 3dnow up pni lahf_lm cmp_legacy&lt;br/&gt;
bogomips        : 4011.50&lt;br/&gt;
TLB size        : 1024 4K pages&lt;br/&gt;
clflush size    : 64&lt;br/&gt;
cache_alignment : 64&lt;br/&gt;
address sizes   : 40 bits physical, 48 bits virtual&lt;br/&gt;
power management: ts fid vid ttp&lt;br/&gt;
&lt;br/&gt;
Linux ec2-xxx-xxx-xxx-xxx.compute-1.amazonaws.com 2.6.21.7-2.fc8xen #1 SMP Fri Feb 15 12:34:28 EST 2008 x86_64 x86_64 x86_64 GNU/Linux&lt;br/&gt;
&lt;br/&gt;
* slave(s):&lt;br/&gt;
Thu Oct 29 17:12:54 Mongo DB : starting : pid = 32723 port = 27017 dbpath = /mongo/master master = 0 slave = 1  64-bit &lt;br/&gt;
Thu Oct 29 17:12:54 db version v1.0.1, pdfile version 4.4&lt;br/&gt;
Thu Oct 29 17:12:54 git version: e316c78bc3dcbd0729454b81eff4e172579c1bc0&lt;br/&gt;
Thu Oct 29 17:12:54 sys info: Linux ofc-n1.10gen.com 2.6.23.17-88.fc7 #1 SMP Thu May 15 00:02:29 EDT 2008 x86_64&lt;br/&gt;
&lt;br/&gt;
2x256GB EBS volumes, stripped. 80% used.&lt;br/&gt;
&lt;br/&gt;
* master:&lt;br/&gt;
Tue Sep 22 21:07:41 Mongo DB : starting : pid = 3063 port = 27017 dbpath = /mnt/mongo/master master = 1 slave = 0  64-bit &lt;br/&gt;
Tue Sep 22 21:07:41 db version v1.0.0, pdfile version 4.4&lt;br/&gt;
Tue Sep 22 21:07:41 git version: dabf2ce54614c6de9d728af445eec47f39dde19f&lt;br/&gt;
Tue Sep 22 21:07:41 sys info: Linux ofc-n1.10gen.com 2.6.23.17-88.fc7 #1 SMP Thu May 15 00:02:29 EDT 2008 x86_64&lt;br/&gt;
&lt;br/&gt;
4x420GB (local, ephemeral) stripped, 26% used&lt;br/&gt;
</environment>
        <key id="10854">SERVER-415</key>
            <summary>Increasing slave lagging</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="eliot">Eliot Horowitz</assignee>
                                    <reporter username="erwan">Erwan Arzur</reporter>
                        <labels>
                    </labels>
                <created>Thu, 12 Nov 2009 05:49:50 +0000</created>
                <updated>Tue, 12 Jul 2016 00:29:48 +0000</updated>
                            <resolved>Thu, 12 Nov 2009 09:51:33 +0000</resolved>
                                    <version>1.0.1</version>
                                                    <component>Replication</component>
                                        <votes>1</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="11138" author="eliot" created="Thu, 12 Nov 2009 23:31:53 +0000"  >&lt;p&gt;Ok.&lt;br/&gt;
If you have a new slave, I would try 1.1.3&lt;br/&gt;
You&apos;ll see greatly improved index creation time.&lt;/p&gt;</comment>
                            <comment id="11135" author="erwan" created="Thu, 12 Nov 2009 11:20:20 +0000"  >&lt;p&gt;No, slave is 1.0.1. Master &lt;b&gt;was&lt;/b&gt; 1.0.0, now updated to 1.0.1.&lt;/p&gt;</comment>
                            <comment id="11134" author="eliot" created="Thu, 12 Nov 2009 10:22:05 +0000"  >&lt;p&gt;so the slave is on 1.1.3 and the master on 1.0.1&lt;/p&gt;</comment>
                            <comment id="11133" author="erwan" created="Thu, 12 Nov 2009 10:19:40 +0000"  >&lt;p&gt;Right, i just did the upgrade, and the slave seems to catch up, but at a slower rate than what i would expect.&lt;/p&gt;

&lt;p&gt;Thu Nov 12 15:17:33 repl: end sync_pullOpLog syncedTo: Wed Nov 11 21:08:04 2009 4afb27b4:6&lt;br/&gt;
Thu Nov 12 15:18:35 pull:   applied 510 operations&lt;br/&gt;
Thu Nov 12 15:18:35 repl: end sync_pullOpLog syncedTo: Wed Nov 11 21:10:35 2009 4afb284b:2&lt;/p&gt;</comment>
                            <comment id="11132" author="eliot" created="Thu, 12 Nov 2009 09:51:33 +0000"  >&lt;p&gt;You found this bug: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-363&quot; title=&quot;merge: capped collection cursor fix&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-363&quot;&gt;&lt;del&gt;SERVER-363&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
you need to upgrade the master to 1.0.1&lt;/p&gt;</comment>
                            <comment id="11131" author="erwan" created="Thu, 12 Nov 2009 09:32:42 +0000"  >&lt;p&gt;Mongod output ...&lt;/p&gt;</comment>
                            <comment id="11130" author="eliot" created="Thu, 12 Nov 2009 09:13:36 +0000"  >&lt;p&gt;can you attach the entire log file?&lt;br/&gt;
also - could you try 1.1.3 on the slave?&lt;/p&gt;</comment>
                    </comments>
                    <attachments>
                            <attachment id="10089" name="mongodb.log-20091112.gz" size="6778484" author="erwan" created="Thu, 12 Nov 2009 09:32:42 +0000"/>
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