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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-1456] Two-Phase Commit</title>
                <link>https://jira.mongodb.org/browse/SERVER-1456</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In addition to a SyncClusterConnection, I suggest implementing TwoPhaseCommit connection (possibly long-term).&lt;/p&gt;

&lt;p&gt;The SyncClusterConnection is a nice idea, but doesn&apos;t scale in practice: when you have lots of clients performing writes via a SyncClusterConnection, you end up flushing your mongo nodes very often. Each server only has a limited amount of flushes it can do per second, which reduces performance a lot.&lt;/p&gt;

&lt;p&gt;Another way to achieve some sort of durability/consistency guarantee with multiple servers is two-phase commit. The flow would be as follows:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;client issues a &quot;request update&quot; command to all servers;&lt;/li&gt;
	&lt;li&gt;all nodes verify this write wouldn&apos;t introduce any errors (&quot;Update-if-Current&quot; comes to mind);&lt;/li&gt;
	&lt;li&gt;client receives verification from all nodes and send commit to all nodes;&lt;/li&gt;
	&lt;li&gt;if some nodes fail during commit, eventual consistency can be used.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;This does require some sort of  row-level locking mechanism within the core servers, so multiple updates for the same objects will be synchronized between servers. However, this would scale very well with many clients talking to a single replication set.&lt;/p&gt;</description>
                <environment></environment>
        <key id="12503">SERVER-1456</key>
            <summary>Two-Phase Commit</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="eliot">Eliot Horowitz</assignee>
                                    <reporter username="solatis">Leon Mergen</reporter>
                        <labels>
                    </labels>
                <created>Wed, 21 Jul 2010 14:25:31 +0000</created>
                <updated>Wed, 20 Jun 2012 19:25:32 +0000</updated>
                            <resolved>Wed, 21 Jul 2010 14:29:49 +0000</resolved>
                                                                    <component>Internal Client</component>
                    <component>Replication</component>
                    <component>Sharding</component>
                                        <votes>1</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="134941" author="auto" created="Wed, 20 Jun 2012 19:25:32 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-06-18T16:52:22-07:00&apos;, u&apos;name&apos;: u&apos;Spencer T Brody&apos;, u&apos;email&apos;: u&apos;spencer@10gen.com&apos;}
&lt;p&gt;Message: Always use internal credetials when connecting to the config servers. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1456&quot; title=&quot;Two-Phase Commit&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1456&quot;&gt;&lt;del&gt;SERVER-1456&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2a2689e7a5823291b125fabddf981ca87ef9a3f0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2a2689e7a5823291b125fabddf981ca87ef9a3f0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="16009" author="eliot" created="Wed, 21 Jul 2010 14:29:43 +0000"  >&lt;p&gt;This is not something we&apos;re planning on enhancing at any point.&lt;br/&gt;
SyncClusterConnection is only designed for internal use.&lt;/p&gt;

&lt;p&gt;For distributed durability, you should use the replication w=N feature.&lt;/p&gt;</comment>
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