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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-14496] Add limit parameter to $or operator to provide control of the number of queries that will be executed in parallel</title>
                <link>https://jira.mongodb.org/browse/SERVER-14496</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Decide whether or not this is necessary and if it is then implement.&lt;/p&gt;

&lt;p&gt;The current $or operator behaviour executes all clauses of an $or in parallel. The default behaviour should remain unchanged, however is it possible to add a control to limit the number of parallel queries (individual $or clauses executed) launched. With a poorly designed query this can cause performance issues at the &lt;tt&gt;mongod&lt;/tt&gt; level and at a sharded level can trigger timeouts from the &lt;tt&gt;mongos&lt;/tt&gt; processes.&lt;/p&gt;</description>
                <environment></environment>
        <key id="145938">SERVER-14496</key>
            <summary>Add limit parameter to $or operator to provide control of the number of queries that will be executed in parallel</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="ramon.fernandez@mongodb.com">Ramon Fernandez Marina</assignee>
                                    <reporter username="eoin.brazil@mongodb.com">Eoin Brazil</reporter>
                        <labels>
                    </labels>
                <created>Tue, 8 Jul 2014 12:47:15 +0000</created>
                <updated>Sat, 9 Jul 2016 21:09:32 +0000</updated>
                            <resolved>Mon, 14 Jul 2014 21:28:33 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="658575" author="rassi@10gen.com" created="Mon, 14 Jul 2014 21:28:17 +0000"  >&lt;p&gt;It is a misconception that parallel processing is used to execute separate branches of $or queries simultaneously.  &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-3731&quot; title=&quot;Clarify that parallel processing not used to execute $or subclauses&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-3731&quot;&gt;&lt;del&gt;DOCS-3731&lt;/del&gt;&lt;/a&gt; has been filed to clarify the documentation.  Logically, the query engine constructs the result set for an $or by generating the set of documents for each clause (in series) and computing the union of those sets.  Adding clauses to an existing $or query does not affect the number of cores utilized for the query.  Resolving as works-as-designed.&lt;/p&gt;</comment>
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