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            <title>[SERVER-3322] sharded aggregations should be very tolerant of node failures</title>
                <link>https://jira.mongodb.org/browse/SERVER-3322</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In large clusters machines will fail frequently.  Aggregation operations in sharded environments should be fairly tolerant of this &amp;#8211; this is important for jobs that require many hours to run.  Two things we want to handle:&lt;/p&gt;

&lt;p&gt;(1) if a node in one shard which was doing work fails, we want the job to still complete.&lt;br/&gt;
(2) if that node&apos;s work is completely restarted, #1 is fixed but the time for the job to complete might double.  that is suboptimal and should be addressed too.&lt;/p&gt;

&lt;p&gt;This applies to both map/reduce and the aggregation framework.  When done in one reassign ticket to the other team?&lt;/p&gt;

&lt;p&gt;This is lower priority than performance optimization and having good concurrency in the frameworks (I&apos;d say do this thereafter).&lt;/p&gt;</description>
                <environment></environment>
        <key id="18611">SERVER-3322</key>
            <summary>sharded aggregations should be very tolerant of node failures</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="dwight@mongodb.com">Dwight Merriman</reporter>
                        <labels>
                            <label>aggregation</label>
                            <label>mapreduce,</label>
                            <label>usability</label>
                    </labels>
                <created>Thu, 23 Jun 2011 15:31:35 +0000</created>
                <updated>Tue, 6 Dec 2022 05:42:50 +0000</updated>
                                                                            <component>Aggregation Framework</component>
                                        <votes>1</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="1777881" author="david.storch" created="Thu, 18 Jan 2018 16:26:25 +0000"  >&lt;p&gt;Fair enough.&lt;/p&gt;</comment>
                            <comment id="1777731" author="kaloian.manassiev" created="Thu, 18 Jan 2018 14:36:01 +0000"  >&lt;p&gt;Sharding already provides framework for reacting to node failures - retryable writes and the RetryPolicy on the async results merger. Making aggregation resumable after failures requires domain knowledge for what can be resumed and making use of the tools which sharding provides. So I don&apos;t think this belongs to sharding.&lt;/p&gt;</comment>
                            <comment id="1777680" author="david.storch" created="Thu, 18 Jan 2018 13:51:28 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kaloian.manassiev&quot; class=&quot;user-hover&quot; rel=&quot;kaloian.manassiev&quot;&gt;kaloian.manassiev&lt;/a&gt;, this ticket is fairly broad and non-specific, but I think it belongs on the sharding team&apos;s backlog. Do you agree?&lt;/p&gt;</comment>
                            <comment id="68689" author="antoine" created="Wed, 23 Nov 2011 23:58:48 +0000"  >&lt;p&gt;Besides fault tolerance, we should also add $partial support for MR&lt;/p&gt;</comment>
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            <issuekey id="191342">SERVER-17696</issuekey>
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