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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-43996] Make the router return flag in response to indicate if partial results were returned</title>
                <link>https://jira.mongodb.org/browse/SERVER-43996</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Right now, a user can opt in to getting partial results (that is, ignoring unreachable shards) by passing &lt;tt&gt;allowPartialResults: true&lt;/tt&gt;&#160; &lt;a href=&quot;https://docs.mongodb.com/manual/reference/command/find/index.html#syntax&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;in their find command&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;However, they have no way to tell if partial results were actually returned.&lt;/p&gt;

&lt;p&gt;This ticket is to make mongos return a flag in its response if partial results were returned.&lt;/p&gt;</description>
                <environment></environment>
        <key id="969194">SERVER-43996</key>
            <summary>Make the router return flag in response to indicate if partial results were returned</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="13201">Fixed</resolution>
                                        <assignee username="bernard.gorman@mongodb.com">Bernard Gorman</assignee>
                                    <reporter username="esha.maharishi@mongodb.com">Esha Maharishi</reporter>
                        <labels>
                    </labels>
                <created>Mon, 14 Oct 2019 19:00:32 +0000</created>
                <updated>Sun, 29 Oct 2023 22:16:08 +0000</updated>
                            <resolved>Wed, 6 Nov 2019 02:29:50 +0000</resolved>
                                                    <fixVersion>4.3.1</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="2519254" author="xgen-internal-githook" created="Wed, 6 Nov 2019 01:37:22 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;gormanb&apos;, &apos;email&apos;: &apos;bernard.gorman@mongodb.com&apos;, &apos;name&apos;: &apos;Bernard Gorman&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43996&quot; title=&quot;Make the router return flag in response to indicate if partial results were returned&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43996&quot;&gt;&lt;del&gt;SERVER-43996&lt;/del&gt;&lt;/a&gt; Return a cursor flag to the client if only a partial subset of results are available&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a4b84bfd711ab0b2c236831abb11f29590ac4393&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a4b84bfd711ab0b2c236831abb11f29590ac4393&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2499024" author="esha.maharishi@10gen.com" created="Thu, 24 Oct 2019 13:21:55 +0000"  >&lt;p&gt;Passed to &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=bernard.gorman&quot; class=&quot;user-hover&quot; rel=&quot;bernard.gorman&quot;&gt;bernard.gorman&lt;/a&gt; per discussion on Chou&apos;s cr above.&lt;/p&gt;</comment>
                    </comments>
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                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="991065">DRIVERS-786</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1065332">DRIVERS-801</issuekey>
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            <issuekey id="991064">DOCS-13201</issuekey>
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                            <customfieldvalue>The &amp;quot;allowPartialResults&amp;quot; option of the &amp;quot;find&amp;quot; command permits a query to run on a sharded cluster even in cases where some of the shards are not available. In this case, the results will consist of the subset of data present on the available shards. However, until now there was no way for a client to know whether the data they received was complete or partial. &lt;br/&gt;
&lt;br/&gt;
This change adds a new field, &amp;quot;partialResultsReturned&amp;quot;, in the &amp;quot;cursor&amp;quot; object returned to the client by the &amp;quot;find&amp;quot; and &amp;quot;getMore&amp;quot; commands. In the event that some of the shards are not available at the time the query is run, or if some shards disconnect while the cursor is being iterated, this field will be present and will have a boolean value of true. If all shards are available, the field will be absent.&lt;br/&gt;
&lt;br/&gt;
This flag is scoped to the cursor, not to an individual operation; all getMores after the point where a shard disconnects will be flagged as &amp;quot;partialResultsReturned&amp;quot;.</customfieldvalue>

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