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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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            <title>[SERVER-44883] Sharded $merge may fail with NotMaster or CursorNotFound if run immediately after a failover on one shard</title>
                <link>https://jira.mongodb.org/browse/SERVER-44883</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When shard A&apos;s Primary steps down and a new Primary is elected, there is a window of time during which the &lt;tt&gt;ReplicaSetMonitor&lt;/tt&gt; on shards other than A still believe the original node is shard A&apos;s Primary. It is possible for a &lt;tt&gt;$merge&lt;/tt&gt; to be issued during this window which is dispatched to shard B and will then fail with a &lt;tt&gt;NotMaster&lt;/tt&gt; exception if it attempts to write to shard A, since the writes will be targeted towards a node which is now Secondary. It appears that it is also possible for a &lt;tt&gt;CursorNotFound&lt;/tt&gt; exception to result due to a &lt;tt&gt;NotMasterNoSlaveOk&lt;/tt&gt; exception on shard A if the &lt;tt&gt;$merge&lt;/tt&gt; is dispatched to a shard as part of the latter half of a split pipeline.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1029594">SERVER-44883</key>
            <summary>Sharded $merge may fail with NotMaster or CursorNotFound if run immediately after a failover on one shard</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="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>qexec-team</label>
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                <created>Fri, 29 Nov 2019 14:14:48 +0000</created>
                <updated>Tue, 6 Dec 2022 02:41:07 +0000</updated>
                                                                            <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2574647" author="bernard.gorman" created="Mon, 2 Dec 2019 16:00:01 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=david.storch&quot; class=&quot;user-hover&quot; rel=&quot;david.storch&quot;&gt;david.storch&lt;/a&gt;: done. Note that I didn&apos;t investigate this much beyond what is outlined in the description; it arose while I was writing a multiversion test, and once I had established what was happening I just worked around it, since it was not relevant to what I was attempting to test.&lt;/p&gt;</comment>
                            <comment id="2574522" author="david.storch" created="Mon, 2 Dec 2019 15:14:41 +0000"  >&lt;p&gt;&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; can you provide a description?&lt;/p&gt;</comment>
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