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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-24968] Make sure we don&apos;t retry non-idempotent writes on &quot;NotMaster&quot; errors that actually did a write</title>
                <link>https://jira.mongodb.org/browse/SERVER-24968</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Generally if you get a NotMaster error back from an attempted write you know that nothing was written.  With &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-24574&quot; title=&quot;Tag internal connections KeepOpen to avoid closing on stepdown&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-24574&quot;&gt;&lt;del&gt;SERVER-24574&lt;/del&gt;&lt;/a&gt;, however, it&apos;s possible for a node that steps down mid-write to actually return NotMaster to the client.  When we write to the config servers, we retry non-idempotent writes on NotMaster errors because we assume no write actually happened, but that assumption is now invalid, so the retries can lead applying a non-idempotent write multiple times.&lt;/p&gt;</description>
                <environment></environment>
        <key id="299799">SERVER-24968</key>
            <summary>Make sure we don&apos;t retry non-idempotent writes on &quot;NotMaster&quot; errors that actually did a write</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="siyuan.zhou@mongodb.com">Siyuan Zhou</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                    </labels>
                <created>Sat, 9 Jul 2016 16:09:49 +0000</created>
                <updated>Fri, 26 Aug 2016 02:40:43 +0000</updated>
                            <resolved>Thu, 25 Aug 2016 17:37:48 +0000</resolved>
                                                                    <component>Replication</component>
                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="1367981" author="siyuan.zhou@10gen.com" created="Thu, 25 Aug 2016 17:37:48 +0000"  >&lt;p&gt;Resolve as a dup to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25126&quot; title=&quot;Return a different error code if the step down occurs after the write&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25126&quot;&gt;&lt;del&gt;SERVER-25126&lt;/del&gt;&lt;/a&gt;. All occurrences of NotMaster have been audited there.&lt;/p&gt;</comment>
                            <comment id="1328673" author="siyuan.zhou@10gen.com" created="Tue, 19 Jul 2016 17:48:26 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=schwerin&quot; class=&quot;user-hover&quot; rel=&quot;schwerin&quot;&gt;schwerin&lt;/a&gt;, yes, that&apos;s the plan. I&apos;ll audit all uses of NotMaster. Updated that ticket&apos;s description.&lt;/p&gt;</comment>
                            <comment id="1327555" author="schwerin" created="Mon, 18 Jul 2016 20:44:18 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=siyuan.zhou&quot; class=&quot;user-hover&quot; rel=&quot;siyuan.zhou&quot;&gt;siyuan.zhou&lt;/a&gt;, when you implement &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25126&quot; title=&quot;Return a different error code if the step down occurs after the write&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25126&quot;&gt;&lt;del&gt;SERVER-25126&lt;/del&gt;&lt;/a&gt;, will that eliminate all cases where NotMaster gets returned even though a write happened?&lt;/p&gt;</comment>
                            <comment id="1319441" author="schwerin" created="Mon, 11 Jul 2016 00:37:15 +0000"  >&lt;p&gt;We need to return a different error code if the step down occurs after vs before the wtite. NotMaster should always mean &quot;no write occurred.&quot; I think there may be another ticket for this.  Check with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=siyuan.zhou&quot; class=&quot;user-hover&quot; rel=&quot;siyuan.zhou&quot;&gt;siyuan.zhou&lt;/a&gt; .&lt;/p&gt;</comment>
                            <comment id="1319130" author="spencer" created="Sat, 9 Jul 2016 16:10:38 +0000"  >&lt;p&gt;Can this also cause us to return NotMaster to end users when a write actually happened, because the connection from the mongos to the shard will be marked internal and not be closed on stepdown?&lt;/p&gt;</comment>
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