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            <title>[SERVER-12347] WriteBatchExecutor should re-use an UpdateDriver across all updates</title>
                <link>https://jira.mongodb.org/browse/SERVER-12347</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In the current implementation of WriteBatchExecutor::execUpdate a new UpdateDriver object is implicitly created (under the write lock) for each update in the batch. Constructing an UpdateDriver is somewhat expensive.&lt;/p&gt;

&lt;p&gt;However, an UpdateDriver object can be re-used, so it would be somewhat better if a single UpdateDriver object was created, than reset to handle each individual update operation in the batch. This would amortize the cost of UpdateDriver construction across all of the updates in the batch.&lt;/p&gt;

&lt;p&gt;This would also have the nice side effect of hoisting UpdateDriver construction out of the write lock, as was done in the old update path.&lt;/p&gt;</description>
                <environment></environment>
        <key id="105852">SERVER-12347</key>
            <summary>WriteBatchExecutor should re-use an UpdateDriver across all updates</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>
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                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="andrew.morrow@mongodb.com">Andrew Morrow</reporter>
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                <created>Mon, 13 Jan 2014 19:23:01 +0000</created>
                <updated>Mon, 5 May 2014 19:18:05 +0000</updated>
                            <resolved>Thu, 16 Jan 2014 16:11:38 +0000</resolved>
                                                                    <component>Internal Code</component>
                    <component>Performance</component>
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