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    <title>MongoDB Jira</title>
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    <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-33113] Do not error on the presence of a &apos;state&apos; field in a transactions table entry</title>
                <link>https://jira.mongodb.org/browse/SERVER-33113</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In 4.2 transaction table entries will have a &apos;state&apos; field added.  To be save upgrade/downgrade work in 4.2, we should be prepared to encounter transaction table entries with a &apos;state&apos; field  in 4.0.  If the &apos;state&apos; is &apos;committed&apos;, we should treat it the same as if there was no state field.  If the &apos;state&apos; field is anything other than &apos;committed&apos;, then we should treat it as though that transaction table entry doesn&apos;t exist.&lt;/p&gt;</description>
                <environment></environment>
        <key id="492120">SERVER-33113</key>
            <summary>Do not error on the presence of a &apos;state&apos; field in a transactions table entry</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="13201">Fixed</resolution>
                                        <assignee username="siyuan.zhou@mongodb.com">Siyuan Zhou</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                    </labels>
                <created>Sat, 3 Feb 2018 21:18:20 +0000</created>
                <updated>Sun, 29 Oct 2023 22:35:07 +0000</updated>
                            <resolved>Wed, 16 May 2018 18:38:22 +0000</resolved>
                                                    <fixVersion>4.0.0-rc0</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1893191" author="xgen-internal-githook" created="Wed, 16 May 2018 18:37:21 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;siyuan.zhou@mongodb.com&apos;, &apos;username&apos;: &apos;visualzhou&apos;, &apos;name&apos;: &apos;Siyuan Zhou&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33113&quot; title=&quot;Do not error on the presence of a &amp;#39;state&amp;#39; field in a transactions table entry&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33113&quot;&gt;&lt;del&gt;SERVER-33113&lt;/del&gt;&lt;/a&gt; Make SessionTxnRecord IDL non-strict.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/417673fd65eac197f4bc21aab5ae5791b272dbf2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/417673fd65eac197f4bc21aab5ae5791b272dbf2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1892343" author="siyuan.zhou@10gen.com" created="Tue, 15 May 2018 23:58:12 +0000"  >&lt;p&gt;Discussed with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=spencer&quot; class=&quot;user-hover&quot; rel=&quot;spencer&quot;&gt;spencer&lt;/a&gt; offline. The &quot;state&quot; field isn&apos;t the only issue for downgrade from 4.2 to 4.0. The oplog format will be different and retryable writes after downgrade will need to walk back through the oplog chain and crash after seeing unexpected formats. Thus we may need to clean the transaction table or force users to use new sessions. That makes the original problem in this description not relevant anymore.&lt;/p&gt;

&lt;p&gt;We can also only support downgrade from 4.2 to a higher version of 4.0 so that we can add compatibility support in later minor versions of 4.0, when the 4.2 change becomes clear.&lt;/p&gt;

&lt;p&gt;For upgrade, because 4.2 needs to support FCV 4.0, we have to keep the current logic and oplog format for mixed version replsets in FCV 4.0. When &lt;b&gt;all&lt;/b&gt; nodes have been upgraded to 4.2, the FCV can be updated.&lt;/p&gt;

&lt;p&gt;The only change needed in this ticket is to relax the IDL of transaction table to allow unexpected fields in 4.0 since the transaction table is only accessed internally and not directly by users.&lt;/p&gt;</comment>
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            <issuekey id="492862">SERVER-33138</issuekey>
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