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    <link>https://jira.mongodb.org</link>
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    <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-74600] Fix test bugs due to secondary reads in `merge_all_chunks_on_shard.js`</title>
                <link>https://jira.mongodb.org/browse/SERVER-74600</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;b&gt;REASON 1&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;The purpose of &lt;a href=&quot;https://github.com/mongodb/mongo/blob/95095d506bedfccb3895b0aa434eaa03870e07fd/jstests/sharding/merge_all_chunks_on_shard.js#L403-L407&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this assertion&lt;/a&gt; is to make sure the configurable interval to re-trigger the auto-merge &lt;a href=&quot;https://github.com/mongodb/mongo/blob/95095d506bedfccb3895b0aa434eaa03870e07fd/jstests/sharding/merge_all_chunks_on_shard.js#L390-L392&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;is respected&lt;/a&gt;. The original idea was to keep it at 5 seconds to pad some slack, however on slow test variants this seems not to be enough because a CSRS secondary could be very lagged causing &lt;a href=&quot;https://github.com/mongodb/mongo/blob/856196e8b82e6ce937def03b2a20d3166e72b0bd/jstests/sharding/merge_all_chunks_on_shard.js#L405&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this query&lt;/a&gt; to find no documents.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;REASON 2&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;When splitting/merging chunks continuously &lt;a href=&quot;https://github.com/mongodb/mongo/blob/856196e8b82e6ce937def03b2a20d3166e72b0bd/jstests/sharding/merge_all_chunks_on_shard.js#L401-L408&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;within this loop&lt;/a&gt;, it can happen that &lt;a href=&quot;https://github.com/mongodb/mongo/blob/856196e8b82e6ce937def03b2a20d3166e72b0bd/src/mongo/s/commands/cluster_split_cmd.cpp#L136-L138&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the refresh triggered on the router when serving the split request&lt;/a&gt; goes to a secondary, not acknowledging the merge that happened right before.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2280851">SERVER-74600</key>
            <summary>Fix test bugs due to secondary reads in `merge_all_chunks_on_shard.js`</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="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</assignee>
                                    <reporter username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</reporter>
                        <labels>
                    </labels>
                <created>Fri, 3 Mar 2023 16:26:47 +0000</created>
                <updated>Sun, 29 Oct 2023 21:25:20 +0000</updated>
                            <resolved>Fri, 17 Mar 2023 15:04:07 +0000</resolved>
                                                    <fixVersion>7.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5280567" author="xgen-internal-githook" created="Fri, 17 Mar 2023 15:02:59 +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-74600&quot; title=&quot;Fix test bugs due to secondary reads in `merge_all_chunks_on_shard.js`&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74600&quot;&gt;&lt;del&gt;SERVER-74600&lt;/del&gt;&lt;/a&gt; Retry split in merge_all_chunks_on_shard.js test&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/471482e842d08f49d245f7f9125d1572c43d514c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/471482e842d08f49d245f7f9125d1572c43d514c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5268355" author="xgen-internal-githook" created="Mon, 13 Mar 2023 17:06:13 +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-74600&quot; title=&quot;Fix test bugs due to secondary reads in `merge_all_chunks_on_shard.js`&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74600&quot;&gt;&lt;del&gt;SERVER-74600&lt;/del&gt;&lt;/a&gt; Fix test bugs due to secondary reads in `merge_all_chunks_on_shard.js`&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4833e2f00f5ed11b8b2c0b34c61bb7527ee75b7f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4833e2f00f5ed11b8b2c0b34c61bb7527ee75b7f&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1640575">SERVER-54979</issuekey>
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