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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-71479] Merging chunks must not set `validAfter` to the current wall time</title>
                <link>https://jira.mongodb.org/browse/SERVER-71479</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When two or more contiguous chunks belonging to the same shards are being merged, the shard is sending to the config server a &lt;tt&gt;validAfter&lt;/tt&gt; field &lt;a href=&quot;https://github.com/mongodb/mongo/blob/4cfd9b936b68622274e39100b7859ea8eb089ad8/src/mongo/db/s/shardsvr_merge_chunks_command.cpp#L68&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;set to the current time&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;This is wrong because merging is not implying any ownership change.&lt;/p&gt;

&lt;p&gt;Setting an unnecessary value for &lt;tt&gt;validAfter&lt;/tt&gt; has the side effect of potentially breaking snapshot reads.&lt;/p&gt;

&lt;p&gt;Example assuming history window of 300 seconds:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Contiguous chunks A-B-C have never been migrated, so their history is empty&lt;/li&gt;
	&lt;li&gt;A merge is called for such chunks at time 100&lt;/li&gt;
	&lt;li&gt;The new chunk will have &lt;tt&gt;validAfter: 100&lt;/tt&gt;&lt;/li&gt;
	&lt;li&gt;A snapshot read arrives at time &lt;tt&gt;99&lt;/tt&gt;: it can&apos;t be served because the pre-100 history is missing, even if it was empty.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Purpose of this ticket is to set the &lt;tt&gt;validAfter&lt;/tt&gt; field to the higher &lt;tt&gt;validAfter&lt;/tt&gt; belonging to one of the chunks to merge or - in case of empty history on all of them - not setting it.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2189573">SERVER-71479</key>
            <summary>Merging chunks must not set `validAfter` to the current wall time</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="silvia.surroca@mongodb.com">Silvia Surroca</assignee>
                                    <reporter username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</reporter>
                        <labels>
                    </labels>
                <created>Fri, 18 Nov 2022 11:44:50 +0000</created>
                <updated>Sun, 29 Oct 2023 21:30:20 +0000</updated>
                            <resolved>Mon, 5 Dec 2022 22:13:55 +0000</resolved>
                                                    <fixVersion>6.0.4</fixVersion>
                    <fixVersion>6.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5086420" author="xgen-internal-githook" created="Tue, 3 Jan 2023 13:26:17 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Silvia Surroca&apos;, &apos;email&apos;: &apos;silvia.surroca@mongodb.com&apos;, &apos;username&apos;: &apos;silviasuhu&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-71479&quot; title=&quot;Merging chunks must not set `validAfter` to the current wall time&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-71479&quot;&gt;&lt;del&gt;SERVER-71479&lt;/del&gt;&lt;/a&gt; Merging chunks must not set `validAfter` to the current wall time&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e2dc8a74fa2d708cc560fb79c29c60cbce4e659a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e2dc8a74fa2d708cc560fb79c29c60cbce4e659a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5031266" author="xgen-internal-githook" created="Mon, 5 Dec 2022 20:37:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Pierlauro Sciarelli&apos;, &apos;email&apos;: &apos;pierlauro.sciarelli@mongodb.com&apos;, &apos;username&apos;: &apos;pierlauro&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-71479&quot; title=&quot;Merging chunks must not set `validAfter` to the current wall time&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-71479&quot;&gt;&lt;del&gt;SERVER-71479&lt;/del&gt;&lt;/a&gt; Merging chunks must not set `validAfter` to the current wall time&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d3af256f1a2a07aefdeb18a9af12c08763bd8b21&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d3af256f1a2a07aefdeb18a9af12c08763bd8b21&lt;/a&gt;&lt;/p&gt;</comment>
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