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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-51448] Fix change_stream_error_label.js test to explicitly set primary shard</title>
                <link>https://jira.mongodb.org/browse/SERVER-51448</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This test sets up a change stream pipeline to run on both shards, establishes a &lt;tt&gt;find&lt;/tt&gt; cursor on both shards, tears down one shard to induce a network exception on the next &lt;tt&gt;getMore&lt;/tt&gt;, and verifies that the change stream error returned to the client has the expected &lt;tt&gt;ResumableChangeStreamError&lt;/tt&gt; label while the &lt;tt&gt;find&lt;/tt&gt; error does not. The reason the test is failing is because it does not explicitly set which shard is the primary shard for the test database at the outset. If the &quot;wrong&quot; shard is chosen by the system, then the test will not encounter a network error when issuing the &lt;tt&gt;getMore&lt;/tt&gt;, since it will be sent only to the shard that still exists.&lt;/p&gt;

&lt;p&gt;The &lt;tt&gt;find&lt;/tt&gt; cursor is run with a &lt;tt&gt;batchSize&lt;/tt&gt; of 2 in order to ensure that the cursor does not consume all results and close after the first batch. This causes 2 results to be retrieved from each shard and cached on &lt;tt&gt;mongoS&lt;/tt&gt;. Because the results are sorted, the first 2 results returned by the &lt;tt&gt;mongoS&lt;/tt&gt; are both drawn from the shard with the {&lt;tt&gt;MinKey, {_id: 0&lt;/tt&gt;}} chunk - that is, the primary shard. We then tear down one of the shards and issue a &lt;tt&gt;getMore&lt;/tt&gt; on the cursor. If the shard that has been torn down was the shard from which the initial two results were drawn, then the &lt;tt&gt;mongoS&lt;/tt&gt; will attempt to issue a &lt;tt&gt;getMore&lt;/tt&gt; to that shard to refill its empty cache, only to find the shard uncontactable. If, however, we have just torn down the shard whose results are still cached on &lt;tt&gt;mongoS&lt;/tt&gt;, then &lt;tt&gt;mongoS&lt;/tt&gt; will not issue a &lt;tt&gt;getMore&lt;/tt&gt; to the downed shard; instead, it will issue a &lt;tt&gt;getMore&lt;/tt&gt; to the shard that still exists, the &lt;tt&gt;getMore&lt;/tt&gt; will succeed, we will not throw the expected exception, and the test will fail as a result.&lt;/p&gt;

&lt;p&gt;We should explicitly set the primary shard on startup, and make sure that this is the shard that we tear down later in the test.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1508021">SERVER-51448</key>
            <summary>Fix change_stream_error_label.js test to explicitly set primary shard</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="bernard.gorman@mongodb.com">Bernard Gorman</assignee>
                                    <reporter username="bernard.gorman@mongodb.com">Bernard Gorman</reporter>
                        <labels>
                    </labels>
                <created>Fri, 9 Oct 2020 01:53:18 +0000</created>
                <updated>Sun, 29 Oct 2023 22:02:11 +0000</updated>
                            <resolved>Sat, 10 Oct 2020 00:27:25 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3437797" author="xgen-internal-githook" created="Fri, 9 Oct 2020 21:39:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Bernard Gorman&apos;, &apos;email&apos;: &apos;bernard.gorman@gmail.com&apos;, &apos;username&apos;: &apos;gormanb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-51448&quot; title=&quot;Fix change_stream_error_label.js test to explicitly set primary shard&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-51448&quot;&gt;&lt;del&gt;SERVER-51448&lt;/del&gt;&lt;/a&gt; Fix change_stream_error_label.js test to explicitly set primary shard&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/393c2ad49763c9342a5d1a7cac85cd25e69785fe&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/393c2ad49763c9342a5d1a7cac85cd25e69785fe&lt;/a&gt;&lt;/p&gt;</comment>
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