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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-36497] block returning from setFeatureCompatibilityVersion during 4.0 downgrade on all prepared transactions completing</title>
                <link>https://jira.mongodb.org/browse/SERVER-36497</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="585020">SERVER-36497</key>
            <summary>block returning from setFeatureCompatibilityVersion during 4.0 downgrade on all prepared transactions completing</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="vesselina.ratcheva@mongodb.com">Vesselina Ratcheva</assignee>
                                    <reporter username="judah.schvimer@mongodb.com">Judah Schvimer</reporter>
                        <labels>
                            <label>prepare_testing</label>
                    </labels>
                <created>Tue, 7 Aug 2018 16:57:18 +0000</created>
                <updated>Sun, 29 Oct 2023 22:29:11 +0000</updated>
                            <resolved>Mon, 29 Apr 2019 23:35:13 +0000</resolved>
                                                    <fixVersion>4.1.11</fixVersion>
                                    <component>Replication</component>
                    <component>Upgrade/Downgrade</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="2228497" author="xgen-internal-githook" created="Mon, 29 Apr 2019 23:04:25 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;vesselina.ratcheva@10gen.com&apos;, &apos;name&apos;: &apos;Vesselina Ratcheva&apos;, &apos;username&apos;: &apos;vessy-mongodb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36497&quot; title=&quot;block returning from setFeatureCompatibilityVersion during 4.0 downgrade on all prepared transactions completing&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36497&quot;&gt;&lt;del&gt;SERVER-36497&lt;/del&gt;&lt;/a&gt; Test that downgrading FCV to 4.0 waits for prepared transactions to finish&lt;/p&gt;

&lt;p&gt;This reverts commit 7dc70f2fd69bd6ad687d7cdc4c0d0c20ac6d9dc5.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7ea05d8684052198c595dee0b9a9cabf652e904d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7ea05d8684052198c595dee0b9a9cabf652e904d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2222041" author="xgen-internal-githook" created="Tue, 23 Apr 2019 16:41:24 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;vesselina.ratcheva@10gen.com&apos;, &apos;name&apos;: &apos;Vesselina Ratcheva&apos;, &apos;username&apos;: &apos;vessy-mongodb&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36497&quot; title=&quot;block returning from setFeatureCompatibilityVersion during 4.0 downgrade on all prepared transactions completing&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36497&quot;&gt;&lt;del&gt;SERVER-36497&lt;/del&gt;&lt;/a&gt; Test that downgrading FCV to 4.0 waits for prepared transactions to finish&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 6888034d41a3c0fd15950051940cf5e7ede5ba19.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7dc70f2fd69bd6ad687d7cdc4c0d0c20ac6d9dc5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7dc70f2fd69bd6ad687d7cdc4c0d0c20ac6d9dc5&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2221192" author="xgen-internal-githook" created="Mon, 22 Apr 2019 21:20:40 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;vesselina.ratcheva@10gen.com&apos;, &apos;name&apos;: &apos;Vesselina Ratcheva&apos;, &apos;username&apos;: &apos;vessy-mongodb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36497&quot; title=&quot;block returning from setFeatureCompatibilityVersion during 4.0 downgrade on all prepared transactions completing&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36497&quot;&gt;&lt;del&gt;SERVER-36497&lt;/del&gt;&lt;/a&gt; Test that downgrading FCV to 4.0 waits for prepared transactions to finish&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6888034d41a3c0fd15950051940cf5e7ede5ba19&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6888034d41a3c0fd15950051940cf5e7ede5ba19&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2158395" author="judah.schvimer" created="Thu, 21 Feb 2019 15:12:21 +0000"  >&lt;p&gt;This ticket is just about testing that the behavior is correct today. Moving to &quot;prepare_testing&quot; label as a result.&lt;/p&gt;</comment>
                            <comment id="2141623" author="judah.schvimer" created="Thu, 7 Feb 2019 20:14:12 +0000"  >&lt;p&gt;As discussed with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=siyuan.zhou&quot; class=&quot;user-hover&quot; rel=&quot;siyuan.zhou&quot;&gt;siyuan.zhou&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=tess.avitabile&quot; class=&quot;user-hover&quot; rel=&quot;tess.avitabile&quot;&gt;tess.avitabile&lt;/a&gt;, we&apos;ll leave the downgrade behavior as it is today where we abort unprepared transactions so that downgrade blocks other operations for less time.&lt;/p&gt;</comment>
                            <comment id="2141410" author="judah.schvimer" created="Thu, 7 Feb 2019 18:23:52 +0000"  >&lt;p&gt;It would speed up downgrade in terms of not blocking acquiring the global S lock. I think having downgrade take longer but do fewer special things would be preferable.&lt;/p&gt;</comment>
                            <comment id="2140406" author="siyuan.zhou@10gen.com" created="Wed, 6 Feb 2019 22:09:25 +0000"  >&lt;p&gt;Aborting unprepared transactions will still speed up the downgrade, right? That&apos;s a separate issue from &quot;waiting or failing&quot; though.&lt;/p&gt;</comment>
                            <comment id="2140195" author="judah.schvimer" created="Wed, 6 Feb 2019 19:15:23 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=schwerin&quot; class=&quot;user-hover&quot; rel=&quot;schwerin&quot;&gt;schwerin&lt;/a&gt;&apos;s suggestion was purely to make the implementation easier. I agree the global S lock will block on prepared transactions to finish. Since that occurs after we transition to &quot;downgrading to 4.0&quot; and stop allowing new prepared transactions, I think this ticket is &quot;remove code for aborting transactions on FCV downgrade&quot; and testing both that and the blocking behavior that is expected to already work.&lt;/p&gt;</comment>
                            <comment id="2138488" author="maria.vankeulen" created="Tue, 5 Feb 2019 18:10:04 +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; I am not aware of any unintended consequences for leaving the database in the downgrading state until a successful downgrade occurs; this is a valid state to be in if a downgrade fails. I agree with Tess.&lt;/p&gt;</comment>
                            <comment id="2138378" author="siyuan.zhou@10gen.com" created="Tue, 5 Feb 2019 17:25:45 +0000"  >&lt;p&gt;Since we &lt;a href=&quot;https://github.com/mongodb/mongo/blob/e4dfae870226f59ad882aef4c070fc23d031782b/src/mongo/db/commands/set_feature_compatibility_version_command.cpp#L214&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;wait for a global S lock&lt;/a&gt;&#160;in FCV change and we probably still need it for upgrade and downgrade of larger transaction project, it seems we already block on prepared transactions. If Andy&apos;s suggestions was to make implementation easier, maybe waiting is actually easier?&lt;/p&gt;</comment>
                            <comment id="2138145" author="judah.schvimer" created="Tue, 5 Feb 2019 15:51:14 +0000"  >&lt;p&gt;To clarify, I don&apos;t actually see a problem with leaving the database in &quot;downgrading to 4.0&quot;. I wasn&apos;t sure if there would be any unintended consequences of which I was unaware and wanted to check.&lt;/p&gt;</comment>
                            <comment id="2137998" author="tess.avitabile" created="Tue, 5 Feb 2019 14:39:33 +0000"  >&lt;p&gt;I don&apos;t see the problem with leaving the database in &quot;downgrading to 4.0&quot;. The user still intends to downgrade, so they are likely to keep retrying to set the FCV to 4.0. Remaining in the &quot;downgrading to 4.0&quot; state also will ensure that there are no new prepared transactions, while the remaining prepared transactions resolve. It&apos;s very similar to blocking in the setFCV command while waiting for prepared transactions to resolve.&lt;/p&gt;</comment>
                            <comment id="2137865" author="judah.schvimer" created="Tue, 5 Feb 2019 12:51:11 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=siyuan.zhou&quot; class=&quot;user-hover&quot; rel=&quot;siyuan.zhou&quot;&gt;siyuan.zhou&lt;/a&gt; pointed out that the ordering here between failing the FCV change and downgrading FCV to &quot;downgrading to 4.0&quot; is not atomic and thus needs some thought. We need to fail the downgrade after changing the FCV to &quot;downgrading to 4.0&quot;, otherwise a new &lt;tt&gt;prepareTransaction&lt;/tt&gt; command could arrive before changing the FCV, after we decided not to fail. If we fail after changing the FCV to &quot;downgrading to 4.0&quot; , then we leave the database dangling in this downgrading state, which may not be ideal. &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=maria.vankeulen&quot; class=&quot;user-hover&quot; rel=&quot;maria.vankeulen&quot;&gt;maria.vankeulen&lt;/a&gt;, do you have any ideas or thoughts on this?&lt;/p&gt;</comment>
                            <comment id="2114957" author="misha.tyulenev" created="Mon, 14 Jan 2019 22:33:24 +0000"  >&lt;p&gt;Thanks!&lt;/p&gt;</comment>
                            <comment id="2114933" author="vesselina.ratcheva" created="Mon, 14 Jan 2019 22:21:16 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=misha.tyulenev&quot; class=&quot;user-hover&quot; rel=&quot;misha.tyulenev&quot;&gt;misha.tyulenev&lt;/a&gt; the FCV changes are going to be part of this ticket, so you don&apos;t need to make any.&lt;/p&gt;</comment>
                            <comment id="2114594" author="misha.tyulenev" created="Mon, 14 Jan 2019 19:33:40 +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; I&apos;m about to submit for review a fix for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36485&quot; title=&quot;&#8216;killSessions&#8217; (for one session) and &amp;#39;endSessions&amp;#39; should return a &#8220;PreparedTransactionInProgress&#8221; error if it tries to kill a session that has a prepared transaction in it&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36485&quot;&gt;&lt;del&gt;SERVER-36485&lt;/del&gt;&lt;/a&gt; which will exclude prepared transaction from killing on FCV downgrade. Do I need to make any changes in fCV code?&lt;/p&gt;</comment>
                            <comment id="2111682" author="judah.schvimer" created="Thu, 10 Jan 2019 21:33:04 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=schwerin&quot; class=&quot;user-hover&quot; rel=&quot;schwerin&quot;&gt;schwerin&lt;/a&gt; pointed out that it should be fine to just fail downgrade if there are prepared transactions in progress, rather than block and wait for them to finish. This should be synchronized such that no transactions can become prepared after this check and before we ensure new &apos;prepareTransaction&apos; commands fail.&lt;/p&gt;

&lt;p&gt;We still need to remove code for aborting transactions on FCV downgrade.&lt;/p&gt;</comment>
                            <comment id="2011950" author="judah.schvimer" created="Mon, 24 Sep 2018 15:05:16 +0000"  >&lt;p&gt;When complete, please file a ticket to remove any upgrade/downgrade code unnecessary in MongoDB 4.4 with the &quot;4.3 Required&quot; fixVersion and the &quot;replication-42-fcv-checks&quot; label.&lt;/p&gt;</comment>
                            <comment id="1970704" author="judah.schvimer" created="Wed, 8 Aug 2018 18:52:49 +0000"  >&lt;p&gt;We also do not need to abort transactions on FCV downgrade anymore.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10320">
                    <name>Documented</name>
                                                                <inwardlinks description="is documented by">
                                        <issuelink>
            <issuekey id="750704">DOCS-12663</issuekey>
        </issuelink>
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                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="744033">SERVER-40793</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="565216">SERVER-35882</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="584977">SERVER-36485</issuekey>
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