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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-44039] Improve $changeStream handling of cluster topology changes</title>
                <link>https://jira.mongodb.org/browse/SERVER-44039</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42723&quot; title=&quot;New shard with new database can be ignored by change streams&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42723&quot;&gt;&lt;del&gt;SERVER-42723&lt;/del&gt;&lt;/a&gt;, we introduced an improved mechanism for change streams to detect the addition of a new shard to the cluster. This was motivated by the fact that the existing &lt;tt&gt;migrateChunkToNewShard&lt;/tt&gt; mechanism was not sufficient to account for all potential cases. At present, the &lt;tt&gt;migrateChunkToNewShard&lt;/tt&gt; oplog notification still exists in master for backward-compatibility and upgrade purposes, but we may wish to remove this during the 4.5 development cycle.&lt;/p&gt;

&lt;p&gt;Alternatively, the two approaches could become complementary. At present, we must always open change stream cursors on all shards, and so the approach implemented by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42723&quot; title=&quot;New shard with new database can be ignored by change streams&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42723&quot;&gt;&lt;del&gt;SERVER-42723&lt;/del&gt;&lt;/a&gt; is always appropriate. However, in the future we may be able to target single-collection or single-DB streams to a subset of shards based on the historical state of the routing table at the moment from which the stream is resuming. In this scenario, the &lt;tt&gt;migrateChunkToNewShard&lt;/tt&gt; approach is appropriate and the new &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42723&quot; title=&quot;New shard with new database can be ignored by change streams&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42723&quot;&gt;&lt;del&gt;SERVER-42723&lt;/del&gt;&lt;/a&gt; mechanism would only be needed in the case of whole-cluster streams, or when a stream is opened on a database which does not yet exist.&lt;/p&gt;</description>
                <environment></environment>
        <key id="971041">SERVER-44039</key>
            <summary>Improve $changeStream handling of cluster topology changes</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="bernard.gorman@mongodb.com">Bernard Gorman</reporter>
                        <labels>
                            <label>change-streams-improvements</label>
                            <label>qexec-team</label>
                    </labels>
                <created>Wed, 16 Oct 2019 13:15:04 +0000</created>
                <updated>Tue, 6 Dec 2022 02:44:43 +0000</updated>
                                                                            <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
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            <issuekey id="491683">SERVER-33090</issuekey>
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            <issuekey id="1360384">SERVER-48386</issuekey>
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