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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-13772] Detached map-reduce jobs</title>
                <link>https://jira.mongodb.org/browse/SERVER-13772</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;For very big long running map-reduce jobs (say, running for days), it might be useful to have ability to detach the operation from the shell/driver, and have some other means of indication that the job has completed or failed.&lt;/p&gt;</description>
                <environment></environment>
        <key id="133746">SERVER-13772</key>
            <summary>Detached map-reduce jobs</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="alex.komyagin@mongodb.com">Alexander Komyagin</reporter>
                        <labels>
                    </labels>
                <created>Mon, 28 Apr 2014 17:53:56 +0000</created>
                <updated>Tue, 6 Dec 2022 05:06:50 +0000</updated>
                            <resolved>Mon, 1 Feb 2016 21:56:12 +0000</resolved>
                                                                    <component>MapReduce</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="1160370" author="geert.bosch" created="Mon, 1 Feb 2016 23:14:53 +0000"  >&lt;p&gt;This request is not something specific to map-reduce jobs. Other operations, such as aggregations or even multi-updates or regular queries, may take a long time as well and have the same issue. The drawback of allowing detached operation is that it will be more likely that unattended jobs will run forever. This would be an issue in particular with commands using server-side JavaScript. Furthermore, it should be expected that commands will have a higher chance of failure if they run longer: an election in a replicaset or some administration commands will also terminate any running commands.&lt;/p&gt;

&lt;p&gt;It may be better to execute commands with very long run time to run in steps, with each step saving intermediate results.&lt;/p&gt;</comment>
                            <comment id="565817" author="charlie.page@10gen.com" created="Mon, 28 Apr 2014 18:36:15 +0000"  >&lt;p&gt;Can we expand this to anything that uses $out or some other way of returning what essentially are async results.&lt;/p&gt;</comment>
                            <comment id="565751" author="alex.komyagin@10gen.com" created="Mon, 28 Apr 2014 17:54:31 +0000"  >&lt;p&gt;I imagine that if a client goes down, MR job will continue executing. However there will be no way to track the status of the job.&lt;/p&gt;</comment>
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