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    <title>MongoDB Jira</title>
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    <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-44610] Missing NonResumableChangeStreamError label from fatal error</title>
                <link>https://jira.mongodb.org/browse/SERVER-44610</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &quot;resume of change stream was not possible&quot; error (location&#160;40585, code name Location40585) is missing a &quot;NonResumeableChangeStreamError&quot; error label, causing drivers to try to resume even though the error is fatal.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1001332">SERVER-44610</key>
            <summary>Missing NonResumableChangeStreamError label from fatal error</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="bernard.gorman@mongodb.com">Bernard Gorman</assignee>
                                    <reporter username="divjot.arora@mongodb.com">Divjot Arora</reporter>
                        <labels>
                            <label>qexec-team</label>
                    </labels>
                <created>Wed, 13 Nov 2019 19:12:44 +0000</created>
                <updated>Fri, 6 Dec 2019 14:18:42 +0000</updated>
                            <resolved>Fri, 6 Dec 2019 14:18:18 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2589472" author="bernard.gorman" created="Fri, 6 Dec 2019 14:18:42 +0000"  >&lt;p&gt;Fixed in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44733&quot; title=&quot;Explicitly return a stream-fatal error in cases where a change stream cannot be automatically resumed&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44733&quot;&gt;&lt;del&gt;SERVER-44733&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="2582653" author="divjot.arora" created="Wed, 4 Dec 2019 11:32:58 +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; I believe this can cause a retry loop because drivers don&apos;t currently have the logic for &quot;if the same error is seen twice in a row, stop resuming.&quot; If a user specifies a read preference that only matches one server or makes the change stream over a direct connection, the same server will be selected for all resume attempts. We do have SPEC-1505 open to potentially add logic to stop if the same error occurs twice, so that may solve this if this isn&apos;t actually a fatal error in all cases.&lt;/p&gt;</comment>
                            <comment id="2582617" author="bernard.gorman" created="Wed, 4 Dec 2019 11:13:29 +0000"  >&lt;p&gt;This exception is thrown if the &lt;tt&gt;mongoD&apos;s&lt;/tt&gt; oplog history does not go back as far as the resume token. I&apos;m inclined to leave this as-is, since I can think of at least one situation in which it is beneficial to have the drivers retry upon encountering this exception: if the change stream is issued with a read preference other than &lt;tt&gt;primary&lt;/tt&gt;, then on the retry the drivers may select an alternative member of the replica set which &lt;b&gt;does&lt;/b&gt; have sufficient oplog to resume the stream. The worst-case scenario here is that the drivers retry, the retry fails for the same reason, and the drivers give up.&lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;Edit&amp;#93;&lt;/span&gt;: apologies, this exception is actually thrown if we have already verified that the oplog has enough history, but the resume token is still not observed in the stream. &lt;tt&gt;ChangeStreamFatalError&lt;/tt&gt; does indeed seem appropriate here.&lt;/p&gt;</comment>
                            <comment id="2561707" author="david.storch" created="Fri, 22 Nov 2019 14:20:30 +0000"  >&lt;p&gt;We should change this from using a unnamed code to using &lt;tt&gt;ChangeStreamFatalError&lt;/tt&gt;.&lt;/p&gt;</comment>
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