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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-28412] Add flag to allow a query to continue running on a secondary after the primary cleans up orphaned documents</title>
                <link>https://jira.mongodb.org/browse/SERVER-28412</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;After a shard donates a chunk, its primary allows queries that were running before the migration to complete before deleting the underlying data.&lt;/p&gt;

&lt;p&gt;The primary does this by tracking the cursors that were active before the migration.&lt;/p&gt;

&lt;p&gt;As part of the Safe Secondary Reads project PM-256, the primary will wait for a short buffer period &lt;em&gt;after&lt;/em&gt; the active cursors on the primary are exhausted before deleting the underlying data. This is in order to allow active cursors on &lt;em&gt;secondaries&lt;/em&gt; to complete before the underlying data is deleted from beneath them.&lt;/p&gt;

&lt;p&gt;To guarantee correctness, the primary will drop an entry in the oplog before deleting the underlying data to signal to secondaries that they should cut off any active queries that have not been exhausted even after the buffer period.&lt;/p&gt;

&lt;p&gt;However, to preserve the behavior of querying secondaries pre-3.6, we will add a flag, most likely to the readConcern, to allow queries on secondaries to continue even if the underlying data gets deleted.&lt;/p&gt;

&lt;p&gt;Drivers may need to do some work to ensure this new readConcern flag is supported.&lt;/p&gt;</description>
                <environment></environment>
        <key id="366650">SERVER-28412</key>
            <summary>Add flag to allow a query to continue running on a secondary after the primary cleans up orphaned documents</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="esha.maharishi@mongodb.com">Esha Maharishi</reporter>
                        <labels>
                    </labels>
                <created>Tue, 21 Mar 2017 16:48:04 +0000</created>
                <updated>Tue, 6 Dec 2022 04:05:01 +0000</updated>
                            <resolved>Tue, 21 Nov 2017 18:52:31 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1731958" author="kaloian.manassiev" created="Tue, 21 Nov 2017 18:52:14 +0000"  >&lt;p&gt;With the introduction of the &quot;available&quot; read concern in 3.6, it is now possible to allow queries to specify whether they care about orphaned documents or are willing to see orphans/have documents deleted from underneath them.&lt;/p&gt;

&lt;p&gt;Because of this, this ticket is no longer necessary.&lt;/p&gt;</comment>
                            <comment id="1595673" author="nathan.myers" created="Tue, 13 Jun 2017 15:55:41 +0000"  >&lt;p&gt;Note that the behavior controlled by this option goes away when we get default snapshot reads, probably 3.8.  &lt;/p&gt;

&lt;p&gt;Come 3.8, we will need an option to turn off snapshot reads for long-running queries with lax consistency requirements.  Probably this option should have a name compatible with that 3.8 usage.&lt;/p&gt;</comment>
                            <comment id="1589011" author="nathan.myers" created="Tue, 6 Jun 2017 19:58:04 +0000"  >&lt;p&gt;The name of the new read-concern option is not settled.&lt;/p&gt;</comment>
                            <comment id="1578359" author="nathan.myers" created="Tue, 23 May 2017 22:26:14 +0000"  >&lt;p&gt;We have agreed that the option is a field of readConcern, &quot;ignoreChunkMigrations&quot; type bool.&lt;/p&gt;</comment>
                            <comment id="1575044" author="nathan.myers" created="Thu, 18 May 2017 23:48:21 +0000"  >&lt;p&gt;Oz has suggested using the existing &lt;/p&gt;
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&lt;p/&gt;
&lt;p&gt;top-level query option to indicate a query should continue even if the underlying data is deleted.  In general, documents deleted by this process moved to another shard, and the query doesn&apos;t know what shard it should have been on, or whether the shard it moved to is still up, so the semantics match.&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="415051">SERVER-30593</issuekey>
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            <issuekey id="386294">SERVER-29344</issuekey>
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