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    <description>This file is an XML representation of an issue</description>
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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-41469] Enforce w:1 for creation of transactions table on step-up</title>
                <link>https://jira.mongodb.org/browse/SERVER-41469</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/6161eb7b7aff5305b445dcdd20825f041b5e5a68/src/mongo/db/session_catalog_mongod.cpp#L153&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;create&lt;/a&gt; the transactions table on step-up via a DBDirectClient call. That will inherit the default writeConcern, which is a problem if the user changed it from w:1. In that case, the call will wait on that WC immediately, while also holding locks (particularly the RSTL in mode X, from the step-up hook). We do not want to do this, as that can block other processes, including servicing find commands for replication. &lt;br/&gt;
We should instead create the transactions table via the storage interface, as that will give us w:1 in all cases.&lt;/p&gt;</description>
                <environment></environment>
        <key id="787760">SERVER-41469</key>
            <summary>Enforce w:1 for creation of transactions table on step-up</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="13201">Fixed</resolution>
                                        <assignee username="jason.chan@mongodb.com">Jason Chan</assignee>
                                    <reporter username="vesselina.ratcheva@mongodb.com">Vesselina Ratcheva</reporter>
                        <labels>
                    </labels>
                <created>Mon, 3 Jun 2019 18:53:31 +0000</created>
                <updated>Sun, 29 Oct 2023 22:20:26 +0000</updated>
                            <resolved>Mon, 1 Jul 2019 20:06:08 +0000</resolved>
                                                    <fixVersion>4.2.0-rc4</fixVersion>
                    <fixVersion>4.3.1</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2334447" author="xgen-internal-githook" created="Fri, 19 Jul 2019 17:06:06 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jason Chan&apos;, &apos;email&apos;: &apos;jason.chan@10gen.com&apos;, &apos;username&apos;: &apos;jasonjhchan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41469&quot; title=&quot;Enforce w:1 for creation of transactions table on step-up&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41469&quot;&gt;&lt;del&gt;SERVER-41469&lt;/del&gt;&lt;/a&gt; Enforce w:1 for creation of transactions table on step-up&lt;/p&gt;

&lt;p&gt;(cherry picked from commit a351f48ad122ca59ed45e5df877ef398c099c938)&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/56852d83dd92ab47063672bd48d94e4439f8c23e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/56852d83dd92ab47063672bd48d94e4439f8c23e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2307482" author="xgen-internal-githook" created="Mon, 1 Jul 2019 20:05:44 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jason Chan&apos;, &apos;email&apos;: &apos;jason.chan@10gen.com&apos;, &apos;username&apos;: &apos;jasonjhchan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41469&quot; title=&quot;Enforce w:1 for creation of transactions table on step-up&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41469&quot;&gt;&lt;del&gt;SERVER-41469&lt;/del&gt;&lt;/a&gt; Enforce w:1 for creation of transactions table on step-up&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a351f48ad122ca59ed45e5df877ef398c099c938&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a351f48ad122ca59ed45e5df877ef398c099c938&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2279883" author="vesselina.ratcheva" created="Tue, 11 Jun 2019 17:24:04 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=judah.schvimer&quot; class=&quot;user-hover&quot; rel=&quot;judah.schvimer&quot;&gt;judah.schvimer&lt;/a&gt; This is indeed a deadlock. The entire replica set can actually fail to make progress because of this, as the primary would not be able to service the finds required for secondaries to replicate the table, while waiting on exactly that table to be replicated. While this can only happen in the relatively niche use case where users modify the default write concern, the fix here is very straightforward and I think we should do it sooner. &lt;br/&gt;
This is really part of a bigger problem with DBDirectClient best described in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29495&quot; title=&quot;Change DBDirectClient to access the query system interface directly&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29495&quot;&gt;SERVER-29495&lt;/a&gt;, but I think we should still make this fix.&lt;/p&gt;</comment>
                            <comment id="2279457" author="judah.schvimer" created="Tue, 11 Jun 2019 14:19:08 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=vesselina.ratcheva&quot; class=&quot;user-hover&quot; rel=&quot;vesselina.ratcheva&quot;&gt;vesselina.ratcheva&lt;/a&gt;, what is the user-visible bug here? Is this a deadlock? If it&apos;s a bug then it doesn&apos;t feel like &quot;Tech Debt&quot;.&lt;/p&gt;</comment>
                            <comment id="2269606" author="vesselina.ratcheva" created="Mon, 3 Jun 2019 20:48:21 +0000"  >&lt;p&gt;While there hasn&apos;t been a 4.0 BF, this is also possible on that version, the only real difference being that we take Global X instead of RSTL X (which does not exist yet). &lt;/p&gt;</comment>
                            <comment id="2269388" author="judah.schvimer" created="Mon, 3 Jun 2019 19:03:14 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=vesselina.ratcheva&quot; class=&quot;user-hover&quot; rel=&quot;vesselina.ratcheva&quot;&gt;vesselina.ratcheva&lt;/a&gt;, is this a 4.0 bug as well? &lt;/p&gt;</comment>
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