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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-13270] mongo master slave replication</title>
                <link>https://jira.mongodb.org/browse/SERVER-13270</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I have set up a master slave replication in mongo.it will work fine for around 8 months.but sudeenly slave show too far behind master.then i Have increase the oplogsize in master upto 60 GB . and resync the slave.slave starts resyncing but after some time it will again start resync and this process is going so frequently.and slave never sync with master.i have checked the log file in slave and it show&lt;/p&gt;



&lt;p&gt;Thu Mar 13 22:15:49.698 &lt;span class=&quot;error&quot;&gt;&amp;#91;replslave&amp;#93;&lt;/span&gt; Socket say send() errno:110 Connection timed out 10.209.135.54:27017&lt;br/&gt;
Thu Mar 13 22:15:49.805 &lt;span class=&quot;error&quot;&gt;&amp;#91;replslave&amp;#93;&lt;/span&gt; repl: DBException socket exception &lt;span class=&quot;error&quot;&gt;&amp;#91;SEND_ERROR&amp;#93;&lt;/span&gt; for 10.209.135.54:27017&lt;br/&gt;
Thu Mar 13 22:15:49.811 &lt;span class=&quot;error&quot;&gt;&amp;#91;replslave&amp;#93;&lt;/span&gt; Socket flush send() errno:110 Connection timed out 10.209.135.54:27017&lt;br/&gt;
Thu Mar 13 22:15:49.811 &lt;span class=&quot;error&quot;&gt;&amp;#91;replslave&amp;#93;&lt;/span&gt;   caught exception (socket exception &lt;span class=&quot;error&quot;&gt;&amp;#91;SEND_ERROR&amp;#93;&lt;/span&gt; for 10.209.135.54:27017) in destructor (~PiggyBackData)&lt;br/&gt;
Thu Mar 13 22:15:49.838 &lt;span class=&quot;error&quot;&gt;&amp;#91;replslave&amp;#93;&lt;/span&gt; repl: sleep 2 sec before next pass&lt;/p&gt;</description>
                <environment></environment>
        <key id="122465">SERVER-13270</key>
            <summary>mongo master slave replication</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="thomas.rueckstiess@mongodb.com">Thomas Rueckstiess</assignee>
                                    <reporter username="ranjeet">RANJEET KUMAR</reporter>
                        <labels>
                            <label>replication</label>
                    </labels>
                <created>Wed, 19 Mar 2014 05:15:40 +0000</created>
                <updated>Wed, 10 Dec 2014 23:14:51 +0000</updated>
                            <resolved>Thu, 20 Mar 2014 19:08:09 +0000</resolved>
                                    <version>2.4.6</version>
                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="666600" author="thomasr" created="Mon, 21 Jul 2014 19:39:24 +0000"  >&lt;p&gt;Hi Ranjeet,&lt;/p&gt;

&lt;p&gt;How many slave nodes do you have? Are you able to use a &lt;a href=&quot;http://docs.mongodb.org/manual/replication/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Replica Set&lt;/a&gt; instead of Master-Slave replication? If so, we recommend you switch to Replica Sets. &lt;/p&gt;

&lt;p&gt;Please also note that the SERVER project is for reporting bugs or feature suggestions for the MongoDB server. &lt;/p&gt;

&lt;p&gt;For MongoDB-related support discussion please post on the mongodb-user group (&lt;a href=&quot;http://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://groups.google.com/group/mongodb-user&lt;/a&gt;) or Stack Overflow with the &lt;tt&gt;mongodb&lt;/tt&gt; tag. A question like this involving more discussion would be best posted on the mongodb-user group. &lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
                            <comment id="665536" author="ranjeet" created="Mon, 21 Jul 2014 17:42:28 +0000"  >&lt;p&gt;Hi Matt,&lt;/p&gt;


&lt;p&gt; Can you tell me the solution...What is the reason for time out..&lt;/p&gt;</comment>
                            <comment id="520725" author="mattd@10gen.com" created="Fri, 21 Mar 2014 14:49:36 +0000"  >&lt;p&gt;Ranjeet,&lt;/p&gt;

&lt;p&gt;I was mistaken and I apologize. There is one reason we recommend users continue to use master-slave over replication and that is if they need more than 12 nodes. Otherwise replica sets are strongly preferred. One reason they are preferred is the issue you have come up against, which is that master-slave does not handle network problems gracefully.&lt;/p&gt;

&lt;p&gt;Hope that gives you a little more insight into what you are seeing and what your options are.&lt;br/&gt;
Matt&lt;/p&gt;</comment>
                            <comment id="520239" author="mattd@10gen.com" created="Thu, 20 Mar 2014 19:08:09 +0000"  >&lt;p&gt;We have effectively deprecated master-slave and advising using replica sets for all replication. In the relatively near future we will be removing master-slave entirely.&lt;/p&gt;

&lt;p&gt;Because of this, we do not actively diagnose master-slave issues and instead suggest upgrade to a replica set. If you are looking for community support or users who are actively using master-slave replication, we highly suggest joining or looking through the mongodb-user group ( &lt;a href=&quot;https://groups.google.com/forum/#!forum/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://groups.google.com/forum/#!forum/mongodb-user&lt;/a&gt; ).&lt;/p&gt;</comment>
                            <comment id="520190" author="ranjeet" created="Thu, 20 Mar 2014 18:14:18 +0000"  >&lt;p&gt;please give me suggestion.why slave resync again and again.and replication breaks.&lt;/p&gt;</comment>
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