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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-28756] Remove TODO SERVER-28756 comment and continue disallowing transactions on the config database through mongos</title>
                <link>https://jira.mongodb.org/browse/SERVER-28756</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42114&quot; title=&quot;Allow single RS transactions to run on the config database excluding config.transactions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42114&quot;&gt;&lt;del&gt;SERVER-42114&lt;/del&gt;&lt;/a&gt; had added a TODO &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-28756&quot; title=&quot;Remove TODO SERVER-28756 comment and continue disallowing transactions on the config database through mongos&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-28756&quot;&gt;&lt;del&gt;SERVER-28756&lt;/del&gt;&lt;/a&gt; comment to follow up after mongos stopped omitting the txnNumber field when writing to the config database. The special codepath ShardingCatalogClientImpl::writeConfigServerDirect() is what caused the txnNumber to be omitted from writes to the config database through mongos. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-51070&quot; title=&quot;Get rid of writeConfigServerDirect for writes to the ConfigServer database&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-51070&quot;&gt;&lt;del&gt;SERVER-51070&lt;/del&gt;&lt;/a&gt; removed the writeConfigServerDirect() function which had special retry logic for writes to the config database.&lt;/p&gt;

&lt;p&gt;After some internal discussion, we don&apos;t believe there is value to permit end users to run replica set transactions or cross&amp;#45;shard transactions on the config database through mongos. The remaining work for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-28756&quot; title=&quot;Remove TODO SERVER-28756 comment and continue disallowing transactions on the config database through mongos&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-28756&quot;&gt;&lt;del&gt;SERVER-28756&lt;/del&gt;&lt;/a&gt; is to remove &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/s/commands/strategy.cpp#L595-L598&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the TODO SERVER-28756 comment&lt;/a&gt; and continue disallowing transactions on the config database through mongos.&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;
		&lt;tbody &gt;
				&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;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// TODO SERVER-28756: Change allowTransactionsOnConfigDatabase to true once we fix the bug&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// where the mongos custom write path incorrectly drops the client&apos;s txnNumber.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;auto allowTransactionsOnConfigDatabase = &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;false&lt;/span&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;;&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;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;validateSessionOptions(*_osi, command-&amp;gt;getName(), nss, allowTransactionsOnConfigDatabase);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;

&lt;hr /&gt;

&lt;h6&gt;&lt;a name=&quot;Originaltitle&quot;&gt;&lt;/a&gt;Original title&lt;/h6&gt;

&lt;p&gt;Remove the custom CSRS config server write retry logic&lt;/p&gt;

&lt;h6&gt;&lt;a name=&quot;Originaldescription&quot;&gt;&lt;/a&gt;Original description &lt;/h6&gt;

&lt;p&gt;In order to support the continuous stepdown suite we implemented a custom write retry logic. Once retriable writes are supported by the server by default, this logic will no longer be necessary in all the places we put it and should be removed or at the very least consolidated within ShardRemote.&lt;/p&gt;</description>
                <environment></environment>
        <key id="373544">SERVER-28756</key>
            <summary>Remove TODO SERVER-28756 comment and continue disallowing transactions on the config database through mongos</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="jason.zhang@mongodb.com">Jason Zhang</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                            <label>ShardedTxn:Testing</label>
                            <label>max-triage</label>
                            <label>neweng</label>
                            <label>open_todo_in_code</label>
                            <label>sharding-nyc-subteam3</label>
                    </labels>
                <created>Wed, 12 Apr 2017 20:21:01 +0000</created>
                <updated>Tue, 22 Nov 2022 23:52:54 +0000</updated>
                            <resolved>Tue, 22 Nov 2022 23:52:54 +0000</resolved>
                                                    <fixVersion>6.3.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5002153" author="xgen-internal-githook" created="Tue, 22 Nov 2022 22:11:36 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jason Zhang&apos;, &apos;email&apos;: &apos;jason.zhang@mongodb.com&apos;, &apos;username&apos;: &apos;jz1242&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-28756&quot; title=&quot;Remove TODO SERVER-28756 comment and continue disallowing transactions on the config database through mongos&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-28756&quot;&gt;&lt;del&gt;SERVER-28756&lt;/del&gt;&lt;/a&gt; Remove TODO &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-28756&quot; title=&quot;Remove TODO SERVER-28756 comment and continue disallowing transactions on the config database through mongos&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-28756&quot;&gt;&lt;del&gt;SERVER-28756&lt;/del&gt;&lt;/a&gt; comment and continue disallowing transactions on the config database through mongos&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c9a912b2757dacc50462a88197250677d73af69c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c9a912b2757dacc50462a88197250677d73af69c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4616961" author="kaloian.manassiev" created="Wed, 15 Jun 2022 10:00:06 +0000"  >&lt;p&gt;As we discussed on Slack: I don&apos;t see any reason to allow that, so it is fine with me to prohibit them.&lt;/p&gt;</comment>
                            <comment id="4582787" author="tommaso.tocci" created="Tue, 31 May 2022 13:19:06 +0000"  >&lt;p&gt;Putting this in needs scheduling even though we think it already went away&lt;/p&gt;</comment>
                            <comment id="2344359" author="jack.mulrow" created="Thu, 25 Jul 2019 18:20:24 +0000"  >&lt;p&gt;The custom logic also drops the client&apos;s txnNumber, which prevented us from allowing transactions to run against the config database through mongos in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42114&quot; title=&quot;Allow single RS transactions to run on the config database excluding config.transactions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42114&quot;&gt;&lt;del&gt;SERVER-42114&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                    </comments>
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