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            <title>[SERVER-38734] POC for change the document shard key</title>
                <link>https://jira.mongodb.org/browse/SERVER-38734</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This ticket is to track work for the change the document shard key project. We plan to implement this by making MongoS drive the update of the shard key with some information returned from MongoD. A high level overview of the steps are as follows:&lt;br/&gt;
1. MongoS passes the entire update statement to MongoD as-is (without checking whether it updates the shard key or not)&lt;br/&gt;
2. UpdateDriver performs the update on the pre-image of the document, without checking whether it modifies the shard key or not and returns a post-image to the UpdateStage, whose responsibility is to write the post-image&lt;br/&gt;
3. UpdateStage uses shard filtering metadata to decide whether the update will cause the document to change shards. If it does, UpdateStage will throw a WouldChangeOwningShard exception with attached ErrorExtraInfo which will contain the original shard key and the post-image. This exception will be returned all the way to MongoS.&lt;br/&gt;
4. MongoS will catch this exception and start a new transaction to insert the updated document on the new owning shard and delete the old document from the previous owning shard&lt;/p&gt;</description>
                <environment></environment>
        <key id="659384">SERVER-38734</key>
            <summary>POC for change the document shard key</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="janna.golden@mongodb.com">Janna Golden</assignee>
                                    <reporter username="janna.golden@mongodb.com">Janna Golden</reporter>
                        <labels>
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                <created>Thu, 20 Dec 2018 23:08:07 +0000</created>
                <updated>Fri, 22 Feb 2019 15:16:40 +0000</updated>
                            <resolved>Fri, 22 Feb 2019 15:16:40 +0000</resolved>
                                                                    <component>Sharding</component>
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