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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-50892] Mirror reads logic incorrectly assumes response is always OK</title>
                <link>https://jira.mongodb.org/browse/SERVER-50892</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The mirrored reads code triggers a fatal assertion if the response from the mirroring request is non-ok: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/1373280c254a39d2ca7d85563718a6f74c927216/src/mongo/db/mirror_maestro.cpp#L382-L386&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/1373280c254a39d2ca7d85563718a6f74c927216/src/mongo/db/mirror_maestro.cpp#L382-L386&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;As far as I can tell, there&apos;s no basis for that assumption, the command could fail for any number of reasons, including network errors.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1471375">SERVER-50892</key>
            <summary>Mirror reads logic incorrectly assumes response is always OK</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="ben.caimano@mongodb.com">Benjamin Caimano</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                            <label>servicearch-wfbf-day</label>
                    </labels>
                <created>Fri, 11 Sep 2020 16:49:02 +0000</created>
                <updated>Sun, 29 Oct 2023 22:03:18 +0000</updated>
                            <resolved>Fri, 25 Sep 2020 20:26:04 +0000</resolved>
                                                    <fixVersion>4.8.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="3412587" author="xgen-internal-githook" created="Fri, 25 Sep 2020 20:24:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ben Caimano&apos;, &apos;email&apos;: &apos;ben.caimano@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-50892&quot; title=&quot;Mirror reads logic incorrectly assumes response is always OK&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-50892&quot;&gt;&lt;del&gt;SERVER-50892&lt;/del&gt;&lt;/a&gt; Mirrored reads tests should excuse retriable errors&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4eaed94d25b5137370ae00652656cab589257399&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4eaed94d25b5137370ae00652656cab589257399&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3387859" author="ben.caimano" created="Fri, 11 Sep 2020 18:00:09 +0000"  >&lt;p&gt;Hmmmmm, so here&apos;s the rub:&lt;br/&gt;
The code that has the fassert is test only on a no passthrough suite. We&apos;re not expecting any failures, and this is the concrete way we can notice if there are any. That said, we&apos;re not in a vacuum. The failure we&apos;re seeing here in BF-18721 is &lt;tt&gt;HostUnreachable&lt;/tt&gt;, probably related to DNS failures. So obviously we can still get network errors, and if we can get network errors we can also get topology errors. How about we change the fatal assertion to check for OK or &lt;a href=&quot;https://github.com/mongodb/mongo/blob/d735d9cf707ff0ea45ec61710e139137a105b821/src/mongo/base/error_codes.yml#L23&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;RetriableErrors&lt;/a&gt;? I think that would cover the domain of acceptable errors. We still don&apos;t want a &lt;tt&gt;BadValue&lt;/tt&gt; or something to slip through.&lt;/p&gt;</comment>
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