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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-48459] Race in non_transaction_snapshot_reads_retry.js</title>
                <link>https://jira.mongodb.org/browse/SERVER-48459</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="1365225">SERVER-48459</key>
            <summary>Race in non_transaction_snapshot_reads_retry.js</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="jesse@mongodb.com">A. Jesse Jiryu Davis</assignee>
                                    <reporter username="jesse@mongodb.com">A. Jesse Jiryu Davis</reporter>
                        <labels>
                    </labels>
                <created>Thu, 28 May 2020 13:05:49 +0000</created>
                <updated>Sun, 29 Oct 2023 22:07:42 +0000</updated>
                            <resolved>Mon, 1 Jun 2020 13:03:16 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3148409" author="jesse" created="Mon, 1 Jun 2020 13:09:25 +0000"  >&lt;p&gt;In the old code:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;insert a document at timestamp insertTS&lt;/li&gt;
	&lt;li&gt;start a snapshot read, expect it to select insertTS as the read timestamp&lt;/li&gt;
	&lt;li&gt;block the read with a failpoint&lt;/li&gt;
	&lt;li&gt;wait minSnapshotHistoryWindowInSeconds&lt;/li&gt;
	&lt;li&gt;update the document at timestamp updateTS&lt;/li&gt;
	&lt;li&gt;unblock the read&lt;/li&gt;
	&lt;li&gt;expect the read to get SnapshotTooOld, retry with a new timestamp &amp;gt;= updateTS&lt;/li&gt;
	&lt;li&gt;assert&#160;that we read the updated document&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;However, between steps 1 and 2 it&apos;s possible for some other write to occur at timestamp T. (Lingzhi noticed that in the build failure, a config server finished building an index on a config colleciton, which advanced the clusterTime.) Then at step 2 we select T for the read timestamp. Sometimes this is possible:&lt;/p&gt;

&lt;p&gt;insertTS &amp;lt; history expiration time &amp;lt; T &amp;lt; updateTS&lt;/p&gt;

&lt;p&gt;At step 7, the read proceeds with timestamp T, which is still valid. There is no SnapshotTooOld error, and we retrieve the version of the document &lt;b&gt;before&lt;/b&gt; it was updated, and the test fails.&lt;/p&gt;

&lt;p&gt;The new code sleeps &lt;b&gt;after&lt;/b&gt; updating the document instead of before, to ensure that the oldest valid read timestamp is &amp;gt;= updateTS.&lt;/p&gt;</comment>
                            <comment id="3148394" author="xgen-internal-githook" created="Mon, 1 Jun 2020 12:53:10 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;A. Jesse Jiryu Davis&apos;, &apos;email&apos;: &apos;jesse@mongodb.com&apos;, &apos;username&apos;: &apos;ajdavis&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48459&quot; title=&quot;Race in non_transaction_snapshot_reads_retry.js&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48459&quot;&gt;&lt;del&gt;SERVER-48459&lt;/del&gt;&lt;/a&gt; Race in non_transaction_snapshot_reads_retry.js&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d66e21d57074813fc49eaca1e91e7c98ed302a75&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d66e21d57074813fc49eaca1e91e7c98ed302a75&lt;/a&gt;&lt;/p&gt;</comment>
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