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        <build-number>970001</build-number>
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            <title>[SERVER-4177] make multi-shard retrying due to stale versions smarter</title>
                <link>https://jira.mongodb.org/browse/SERVER-4177</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In general, when doing multi-shard operations which depend on versions, if a single or only two shards have incorrect versions the command / query needs to be retried on all shards.  This is not usually necessary, and can cause unnecessary load if the command is costly (like mapreduce).  &lt;/p&gt;

&lt;p&gt;Fix : figure out which shards we need to refresh, just retry commands on those servers.  This wouldn&apos;t totally eliminate the problem (if detected a version change on one shard but not the other after a migrate, for example), but would make it much less likely.&lt;/p&gt;</description>
                <environment></environment>
        <key id="24286">SERVER-4177</key>
            <summary>make multi-shard retrying due to stale versions smarter</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="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="-1">Unassigned</assignee>
                                    <reporter username="greg_10gen">Greg Studer</reporter>
                        <labels>
                    </labels>
                <created>Mon, 31 Oct 2011 14:43:31 +0000</created>
                <updated>Mon, 11 Jul 2016 18:32:24 +0000</updated>
                            <resolved>Thu, 6 Mar 2014 21:35:38 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="511085" author="greg_10gen" created="Thu, 6 Mar 2014 21:35:38 +0000"  >&lt;p&gt;Fixed as part of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-4220&quot; title=&quot;refactor getChunkManager() and sharding code to better handle parallel queries.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-4220&quot;&gt;&lt;del&gt;SERVER-4220&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
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