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    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-428] c++ driver should support prefetching (pipelining) of data</title>
                <link>https://jira.mongodb.org/browse/SERVER-428</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;the C++ driver should have an option to asynchronously fire off a getMore mesage before the client consumes the current batch of data, and then wait for the response when the client asks for more data than has so far been received.&lt;/p&gt;

&lt;p&gt;this would improve replication and cloning performance as client and server can then work concurrently &amp;#8211; replication code (repl.cpp) should use this flag.&lt;/p&gt;

&lt;p&gt;some care must be taken that the asynchronous more result is waited for if the client decides not to consume all the data from the query (as this would be an option, perhaps one must consume it all and this is simply an assert check that this is done)&lt;/p&gt;

&lt;p&gt;the same pipelining feature would make sense in other drivers.&lt;/p&gt;</description>
                <environment></environment>
        <key id="10891">SERVER-428</key>
            <summary>c++ driver should support prefetching (pipelining) of data</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="4">Incomplete</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="dwight@mongodb.com">Dwight Merriman</reporter>
                        <labels>
                    </labels>
                <created>Thu, 19 Nov 2009 07:07:27 +0000</created>
                <updated>Wed, 15 Feb 2017 15:37:05 +0000</updated>
                            <resolved>Wed, 15 Feb 2017 15:37:05 +0000</resolved>
                                                                    <component>Internal Client</component>
                                        <votes>1</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="18147" author="dwight_10gen" created="Tue, 14 Sep 2010 11:21:45 +0000"  >&lt;p&gt;this is now available, although was implemented differently than described above&lt;/p&gt;

&lt;p&gt;export utility should use it then can close this&lt;/p&gt;


&lt;p&gt;        /** uses QueryOption_Exhaust &lt;br/&gt;
            use DBClientCursorBatchIterator if you want to do items in large blocks, perhpas to avoid granular locking and such.&lt;br/&gt;
         */&lt;br/&gt;
        unsigned long long query( boost::function&amp;lt;void(const BSONObj&amp;amp;)&amp;gt; f, const string&amp;amp; ns, Query query, const BSONObj *fieldsToReturn = 0, int queryOptions = 0);&lt;/p&gt;</comment>
                            <comment id="11227" author="dwight_10gen" created="Fri, 27 Nov 2009 12:21:00 +0000"  >&lt;p&gt;and the export utility&lt;/p&gt;</comment>
                            <comment id="11226" author="dwight_10gen" created="Fri, 27 Nov 2009 12:20:28 +0000"  >&lt;p&gt;mongofiles should use this option too&lt;/p&gt;</comment>
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