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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-4989] MR: errors that happen during sharded post processing are ignored</title>
                <link>https://jira.mongodb.org/browse/SERVER-4989</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If output collection is not sharded it properly errors, but if sharded then it returns with empty results.&lt;br/&gt;
it is easy to reproduce issue if using &quot;replace&quot; in conjunction with &quot;nonAtomic&quot; which errors.&lt;/p&gt;

&lt;p&gt;Source of issue seems to be that MR code used to spawn Future objects and then check on status,&lt;br/&gt;
but now that code has been buried into a call like:&lt;br/&gt;
SHARDED-&amp;gt;commandOp( dbName, shardedCommand, 0, fullns, q, results );&lt;br/&gt;
That call seems to not properly report the exception.&lt;/p&gt;</description>
                <environment></environment>
        <key id="30828">SERVER-4989</key>
            <summary>MR: errors that happen during sharded post processing are ignored</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="9">Done</resolution>
                                        <assignee username="antoine">Antoine Girbal</assignee>
                                    <reporter username="antoine">Antoine Girbal</reporter>
                        <labels>
                    </labels>
                <created>Thu, 16 Feb 2012 21:04:37 +0000</created>
                <updated>Mon, 11 Jul 2016 18:34:33 +0000</updated>
                            <resolved>Tue, 3 Apr 2012 22:06:33 +0000</resolved>
                                                    <fixVersion>2.1.1</fixVersion>
                                    <component>MapReduce</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="89723" author="auto" created="Sat, 18 Feb 2012 01:10:16 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;agirbal&apos;, u&apos;name&apos;: u&apos;agirbal&apos;, u&apos;email&apos;: u&apos;antoine@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-4989&quot; title=&quot;MR: errors that happen during sharded post processing are ignored&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-4989&quot;&gt;&lt;del&gt;SERVER-4989&lt;/del&gt;&lt;/a&gt;: MR: errors that happen during sharded post processing are ignored&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/49405ce14fc98462a09f94b3c0b79ebe817aa6d3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/49405ce14fc98462a09f94b3c0b79ebe817aa6d3&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="89215" author="antoine" created="Thu, 16 Feb 2012 21:35:04 +0000"  >&lt;p&gt;yes that&apos;s good behavior, just the checks disappeared during the refactor.&lt;br/&gt;
Will add checks on returned object.&lt;/p&gt;</comment>
                            <comment id="89214" author="greg_10gen" created="Thu, 16 Feb 2012 21:33:08 +0000"  >&lt;p&gt;Actually, commandOp will throw if there&apos;s a result with the error flag set - this is arguably not correct behavior for commands, but would merit another JIRA.  &lt;/p&gt;</comment>
                            <comment id="89213" author="greg_10gen" created="Thu, 16 Feb 2012 21:29:16 +0000"  >&lt;p&gt;Think this may be the correct behavior overall? - the idea behind commandOp is that it will return the results of commands across all shards, and will throw only if there&apos;s an issue processing the command.  If the command itself is processed correctly but returns !ok, we may want to handle partial results.&lt;/p&gt;

&lt;p&gt;Helpers could be useful though - maybe verifiedCommandOp() which would go through the results and throw the first exception it finds from a !ok result.    &lt;/p&gt;</comment>
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