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    <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-31806] makeNoopWriter crashes when the last applied optime advances in the face of failed appendOplogNotes.</title>
                <link>https://jira.mongodb.org/browse/SERVER-31806</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I believe this is 3.6 required.&lt;/p&gt;

&lt;p&gt;&lt;tt&gt;makeNoopWriteIfNeeded&lt;/tt&gt; (in &lt;tt&gt;read_concern.cpp&lt;/tt&gt;) will ensure an oplog document exists on the primary with at least the &lt;tt&gt;clusterTime&lt;/tt&gt;. This guarantees the secondary will eventually apply up to the requested &lt;tt&gt;clusterTime&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;This method can succeed in two(ish) cases.&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;The method successfully sends a &lt;tt&gt;appendOplogNote&lt;/tt&gt; to the primary with the requested cluster time. The caller can wait for this document to come down the pipe with confidence.&lt;/li&gt;
	&lt;li&gt;While making requests that are not succeeding, the &lt;tt&gt;lastAppliedOpTime&lt;/tt&gt; continues to advance. If it advances beyond the requested &lt;tt&gt;clusterTime&lt;/tt&gt;, there&apos;s no need to make further requests.&lt;/li&gt;
	&lt;li&gt;A generalization of the previous point, a request may never need to be made, and the method will immediately return.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;The method initializes a return &lt;tt&gt;status&lt;/tt&gt; of OK. Some error cases will immediately return an error code, such as not finding the correct shard, or the number of retries to make the request has been exceeded. Otherwise &lt;tt&gt;status&lt;/tt&gt; is assigned the latest result of the request.&lt;/p&gt;

&lt;p&gt;However, when a request fails, leaving &lt;tt&gt;status&lt;/tt&gt; in an error state, the &lt;tt&gt;lastAppliedOpTime&lt;/tt&gt; is &lt;a href=&quot;https://github.com/mongodb/mongo/blob/51ebfe7bb870a1665653ad8088b121706ce3d5b5/src/mongo/db/read_concern.cpp#L177&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;refreshed&lt;/a&gt;. If this new value exceeds the requested &lt;tt&gt;clusterTime&lt;/tt&gt;, the loop will exit, but the code invariants that the &lt;tt&gt;status&lt;/tt&gt; is &lt;a href=&quot;https://github.com/mongodb/mongo/blob/51ebfe7bb870a1665653ad8088b121706ce3d5b5/src/mongo/db/read_concern.cpp#L179&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;ok&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="454276">SERVER-31806</key>
            <summary>makeNoopWriter crashes when the last applied optime advances in the face of failed appendOplogNotes.</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="13201">Fixed</resolution>
                                        <assignee username="misha.tyulenev@mongodb.com">Misha Tyulenev</assignee>
                                    <reporter username="daniel.gottlieb@mongodb.com">Daniel Gottlieb</reporter>
                        <labels>
                    </labels>
                <created>Thu, 2 Nov 2017 19:22:36 +0000</created>
                <updated>Mon, 30 Oct 2023 23:10:49 +0000</updated>
                            <resolved>Tue, 14 Nov 2017 18:19:14 +0000</resolved>
                                                    <fixVersion>3.6.0-rc4</fixVersion>
                    <fixVersion>3.7.1</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1725466" author="xgen-internal-githook" created="Tue, 14 Nov 2017 18:30:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Misha Tyulenev&apos;, &apos;username&apos;: &apos;mikety&apos;, &apos;email&apos;: &apos;misha@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31806&quot; title=&quot;makeNoopWriter crashes when the last applied optime advances in the face of failed appendOplogNotes.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31806&quot;&gt;&lt;del&gt;SERVER-31806&lt;/del&gt;&lt;/a&gt; do not invariant on the error status in makeNoopWriteIfNeeded&lt;/p&gt;

&lt;p&gt;(cherry picked from commit f6d08a2e38cd27bd0e9a841a6ffc112ce0298d0f)&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/876bb9586ce66ecb8938f679222cf638e7e22b8c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/876bb9586ce66ecb8938f679222cf638e7e22b8c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1725442" author="xgen-internal-githook" created="Tue, 14 Nov 2017 18:14:36 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Misha Tyulenev&apos;, &apos;username&apos;: &apos;mikety&apos;, &apos;email&apos;: &apos;misha@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31806&quot; title=&quot;makeNoopWriter crashes when the last applied optime advances in the face of failed appendOplogNotes.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31806&quot;&gt;&lt;del&gt;SERVER-31806&lt;/del&gt;&lt;/a&gt; do not invariant on the error status in makeNoopWriteIfNeeded&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f6d08a2e38cd27bd0e9a841a6ffc112ce0298d0f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f6d08a2e38cd27bd0e9a841a6ffc112ce0298d0f&lt;/a&gt;&lt;/p&gt;</comment>
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