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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-29514] improve scatterGather() and establishCursors() interfaces around shard targeting policy</title>
                <link>https://jira.mongodb.org/browse/SERVER-29514</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Both scatterGather() and establishCursors() should allow the caller to delegate deciding which shards to target and building versioned or unversioned requests to those shards.&lt;/p&gt;

&lt;p&gt;The caller should just specify a targeting policy (BroadcastToAllShards, UseRoutingTable, etc) and any additional options if relevant (e.g., target for a specific query when using the routing table).&lt;/p&gt;

&lt;p&gt;The current interface is muddled, and doesn&apos;t capture the range of targeting behavior used on mongos.&lt;/p&gt;

&lt;p&gt;Rather than allow lots of if/else blocks, boost::optional arguments, and re-implementations of targeting logic to sprawl across the codebase, we should succinctly express different types of shard targeting policies and the options that go with each, through a clearly differentiated set of functions or a set of classes.&lt;/p&gt;

&lt;p&gt;Some factors that determine a targeting policy and whether requests should be versioned:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;whether the command has an associated collection&lt;/li&gt;
	&lt;li&gt;whether the associated collection is logically part of the routing table (as opposed to, say, $cmd or $aggregate)&lt;/li&gt;
	&lt;li&gt;whether the command is retryable (e.g., writes are currently not)&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="391628">SERVER-29514</key>
            <summary>improve scatterGather() and establishCursors() interfaces around shard targeting policy</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="3">Duplicate</resolution>
                                        <assignee username="esha.maharishi@mongodb.com">Esha Maharishi</assignee>
                                    <reporter username="esha.maharishi@mongodb.com">Esha Maharishi</reporter>
                        <labels>
                    </labels>
                <created>Thu, 8 Jun 2017 13:53:11 +0000</created>
                <updated>Tue, 26 Sep 2017 05:25:40 +0000</updated>
                            <resolved>Tue, 26 Sep 2017 05:25:10 +0000</resolved>
                                    <version>3.5.8</version>
                                                    <component>Sharding</component>
                                        <votes>1</votes>
                                    <watches>3</watches>
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