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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>[COMPASS-6211] Investigate changes in PM-3038: Mongos communicates retryable error labels from shards to drivers</title>
                <link>https://jira.mongodb.org/browse/COMPASS-6211</link>
                <project id="13182" key="COMPASS">Compass </project>
                    <description>    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Original Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;p&gt;    This is a dependency for DRIVERS-555 to be effective. &lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-color: #ccc;border-style: dashed;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;border-bottom-style: dashed;border-bottom-color: #ccc;background-color: #239eb0;&quot;&gt;&lt;b&gt;Epic Summary&lt;/b&gt;&lt;/div&gt;&lt;/div&gt;

&lt;h4&gt;&lt;a name=&quot;Summary&quot;&gt;&lt;/a&gt;Summary&lt;/h4&gt;
&lt;p&gt;Expose RetryableWriteError and NoWritesPerformed error labels from mongos to drivers.&lt;/p&gt;

&lt;h4&gt;&lt;a name=&quot;Motivation&quot;&gt;&lt;/a&gt;Motivation&lt;/h4&gt;
&lt;p&gt;Since MongoDB 4.4 (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41245&quot; title=&quot;Add RetryableWriteError Error Label&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41245&quot;&gt;&lt;del&gt;SERVER-41245&lt;/del&gt;&lt;/a&gt;), drivers rely on the RetryableWriteError label to indicate whether or not an error response from the server warrants a retry. Current versions of mongos only return the RetryableWriteError label when the mongos itself is shutting down and not when there&#8217;s been a retryable error from one of the shards. Note that mongos itself retries on retryable errors from the shards up to three (3) times.&lt;/p&gt;

&lt;p&gt;The work from DRIVERS-555 (Client Side Operations Timeout) enables applications to set a deadline until which the driver should continue to retry. This may mean an application is willing to retry longer than the duration of the retries performed by mongos. Having mongos propagate back a RetryableWriteError label when it gives up retrying can signal to drivers whether they want to continue retrying themselves.&lt;/p&gt;

&lt;p&gt;Moreover, drivers also rely on the NoWritesPerformed error label (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66479&quot; title=&quot;Create an error label indicating if a retryable error is &amp;quot;definite&amp;quot;.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66479&quot;&gt;&lt;del&gt;SERVER-66479&lt;/del&gt;&lt;/a&gt;) to decide upon retry which error response to expose to the application. Current versions of mongos never return the NoWritesPerformed error label.&lt;/p&gt;

&lt;h4&gt;&lt;a name=&quot;Documentation&quot;&gt;&lt;/a&gt;Documentation&lt;/h4&gt;
&lt;p&gt;&lt;a href=&quot;https://docs.google.com/document/d/1OvKs06J68XxGKkHQvrsOnvozSEBwPkZ5ttSAPup3wLw&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Scope Document&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://docs.google.com/document/d/1u1wIWXHo90_MGNceGtObJDmIdmzGEBpvshSn5DNYnZ4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Technical Design Document&lt;/a&gt;&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;
</description>
                <environment></environment>
        <key id="2160604">COMPASS-6211</key>
            <summary>Investigate changes in PM-3038: Mongos communicates retryable error labels from shards to drivers</summary>
                <type id="10501" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Investigation</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="9">Done</resolution>
                                        <assignee username="rhys.howell@mongodb.com">Rhys Howell</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Mon, 17 Oct 2022 16:06:23 +0000</created>
                <updated>Fri, 9 Dec 2022 16:02:51 +0000</updated>
                            <resolved>Wed, 7 Dec 2022 19:22:27 +0000</resolved>
                                                    <fixVersion>No version</fixVersion>
                                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5038311" author="rhys.howell" created="Wed, 7 Dec 2022 19:22:27 +0000"  >&lt;p&gt;I don&apos;t think we need to do anything here for mongosh. We surface the errors the server/driver returns, so any new label from the server or driver will show up. If we want to do work in improving error reporting we could look at &lt;a href=&quot;https://jira.mongodb.org/browse/MONGOSH-1198&quot; title=&quot;Show the code for an error with the error response&quot; class=&quot;issue-link&quot; data-issue-key=&quot;MONGOSH-1198&quot;&gt;&lt;del&gt;MONGOSH-1198&lt;/del&gt;&lt;/a&gt;&#160;&lt;/p&gt;</comment>
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