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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-54661] Snapshotting during tenant migration block will fail all pending transactional reads</title>
                <link>https://jira.mongodb.org/browse/SERVER-54661</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This is from BF-20193. The test is failing because a transactional read was blocked by tenant migration blocker and when if was unblocked the oldest timestamp was already moved forward by the wired tiger, thus read had to fail after migration was aborted. So this really happens by design.&lt;/p&gt;

&lt;p&gt;Here the read fail:&lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;js_test:tenant_migration_concurrent_reads&amp;#93;&lt;/span&gt; 2021-02-13T14:11:25.265+0000 	&quot;errmsg&quot; : &quot;Read timestamp Timestamp(1613225479, 1) is older than the oldest available timestamp.&quot;,&lt;/p&gt;

&lt;p&gt;here is the evidence that WT moved the oldest timestamp:&lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;js_test:tenant_migration_concurrent_reads&amp;#93;&lt;/span&gt; 2021-02-13T14:11:26.358+0000 d21522| 2021-02-13T14:11:26.357+00:00 D2 RECOVERY 23988   &lt;span class=&quot;error&quot;&gt;&amp;#91;SignalHandler&amp;#93;&lt;/span&gt; &quot;Shutdown timestamps.&quot;,&quot;attr&quot;:{&quot;Stable Timestamp&quot;:{&quot;$timestamp&quot;:{&quot;t&quot;:1613225485,&quot;i&quot;:2}},&quot;Initial Data Timestamp&quot;:{&quot;$timestamp&quot;:{&quot;t&quot;:1613225407,&quot;i&quot;:1}},&quot;Oldest Timestamp&quot;:{&quot;$timestamp&quot;:&lt;/p&gt;
{&quot;t&quot;:1613225480,&quot;i&quot;:2}
&lt;p&gt;}}&lt;/p&gt;

&lt;p&gt;My opinion we should simply fix the tenant_migration_concurrent_reads.js test &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c4088911e4347147c11bc3c2fb29e4f562dd7f66/jstests/replsets/tenant_migration_concurrent_reads.js#L79-L86&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt; to allow the TransientTransactionError with oldest timestamp message. After all, we will fail the read anyway if the tenant migration will succeed (common case).&lt;/p&gt;

&lt;p&gt;I&apos;m leaving this as a new bug for someone to agree or disagree with my conclusion. If we keep it as a normal condition, the fix is 3 lines in the test. &lt;/p&gt;

&lt;p&gt;To some extend my question is about migration design - does it make sense to block all reads for undetermined time if they will likely fail anyway? I understand that the user won&apos;t have much option than to retry anyway. But the retry may complete faster because if the new read will have newer timestamp it will not block.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1628730">SERVER-54661</key>
            <summary>Snapshotting during tenant migration block will fail all pending transactional reads</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="andrew.shuvalov@mongodb.com">Andrew Shuvalov</assignee>
                                    <reporter username="andrew.shuvalov@mongodb.com">Andrew Shuvalov</reporter>
                        <labels>
                    </labels>
                <created>Fri, 19 Feb 2021 19:09:50 +0000</created>
                <updated>Sun, 29 Oct 2023 21:57:16 +0000</updated>
                            <resolved>Mon, 1 Mar 2021 17:06:14 +0000</resolved>
                                                    <fixVersion>5.0.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3639649" author="xgen-internal-githook" created="Mon, 1 Mar 2021 15:47:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Andrew Shuvalov&apos;, &apos;email&apos;: &apos;andrew.shuvalov@mongodb.com&apos;, &apos;username&apos;: &apos;shuvalov-mdb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54661&quot; title=&quot;Snapshotting during tenant migration block will fail all pending transactional reads&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54661&quot;&gt;&lt;del&gt;SERVER-54661&lt;/del&gt;&lt;/a&gt;: prevent transactional read in test to fail on snapshotting&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/736d29af863ce061a5d3d2759f9d0b72075dcf09&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/736d29af863ce061a5d3d2759f9d0b72075dcf09&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3637601" author="JIRAUSER1256988" created="Fri, 26 Feb 2021 18:46:41 +0000"  >&lt;p&gt;Filed &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54828&quot; title=&quot;Optimization: tenant migration blocker should not block reads for too long&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54828&quot;&gt;&lt;del&gt;SERVER-54828&lt;/del&gt;&lt;/a&gt; as suggested optimization related to this error.&lt;/p&gt;</comment>
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