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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-16947] Allow db server to write oplog data to another server and collection instead of writing to local db</title>
                <link>https://jira.mongodb.org/browse/SERVER-16947</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In heavy write dbs, we see performance drop when oplog is enabled (Master-Slave, MS or RS).&lt;/p&gt;

&lt;p&gt;In case mongod would allow options f.e. &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;   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;--sendoplogserver [server:port] --sendoplogdb [db] --sendoplogcollection [collection]&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt; this would help the master database to focus just on application needs (to write data) and less overhead would be needed for local writes of the oplog.&lt;/p&gt;

&lt;p&gt;Assuming 4 heavy-write servers. It would be cheap to build one slow server on fast network to receive ALL oplogs from the 4 servers.&lt;/p&gt;</description>
                <environment></environment>
        <key id="179694">SERVER-16947</key>
            <summary>Allow db server to write oplog data to another server and collection instead of writing to local db</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="9">Done</resolution>
                                        <assignee username="milkie@mongodb.com">Eric Milkie</assignee>
                                    <reporter username="gianfranco">Gianfranco Palumbo</reporter>
                        <labels>
                    </labels>
                <created>Tue, 20 Jan 2015 18:18:46 +0000</created>
                <updated>Sun, 15 Feb 2015 15:53:34 +0000</updated>
                            <resolved>Sun, 15 Feb 2015 02:54:19 +0000</resolved>
                                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="829554" author="eliot" created="Sun, 15 Feb 2015 02:53:46 +0000"  >&lt;p&gt;A key requirement for the oplog is that the data and oplog entry are done transactionally.&lt;br/&gt;
Don&apos;t think we&apos;re going to want to be doing 2 phase commits for the oplog.&lt;br/&gt;
Lots of other options for improving oplog performance though, which is always going to be something we work on.&lt;/p&gt;</comment>
                            <comment id="815231" author="marian.badinka@dhl.com" created="Wed, 28 Jan 2015 10:53:43 +0000"  >&lt;p&gt;Hi Eric,&lt;/p&gt;

&lt;p&gt;I do not think the &quot;serializing&quot; of writes via socket is an issue, because it happens on daily basis when the Slaves are reading the oplog from Master via network - what is serial transmission.&lt;/p&gt;

&lt;p&gt;I also think network latency is also not an issue and if a user/admin/architect could choose if to use local oplog or remote oplog, this would increase the &quot;creativity&quot; and allow to use mongodb in many more use cases.&lt;/p&gt;

&lt;p&gt;Regards \ marian&lt;/p&gt;

</comment>
                            <comment id="814717" author="milkie" created="Tue, 27 Jan 2015 20:29:51 +0000"  >&lt;p&gt;An interesting idea.  In your example, you would be making the oplog server a single point of failure for all 4 servers if you did that, though.  Also, it would be super easy to corrupt things if you provided an incorrect parameter to your proposed command line flags.  Finally, I&apos;m not sure it would help much, since you would either need to stream the writes through one socket (thus serializing writes the same as when writing locally, except possibly with worse performance), or you would need to use multiple sockets, one per incoming user connection, which may not scale well.&lt;/p&gt;</comment>
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