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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-30822] Update does not give an error message when $setOnInsert fails on FCV 3.6</title>
                <link>https://jira.mongodb.org/browse/SERVER-30822</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;After setting FCV to 3.6 on 3.5.12, the mongo shell session appears as from the repro. This is different from FCV 3.4, which would give the following response:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;WriteResult({&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	&quot;nMatched&quot; : 0,&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	&quot;nUpserted&quot; : 0,&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	&quot;nModified&quot; : 0,&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	&quot;writeError&quot; : {&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;		&quot;code&quot; : 16837,&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;In the example, field &apos;a&apos; can actually be nearly any data type including a number, a string, an array, NaN, null, or undefined. This difference can also be observed regardless of whether &lt;em&gt;multi&lt;/em&gt;  or &lt;em&gt;upsert&lt;/em&gt; is set to true / false. FCV 3.6 would return nMatched as the number of documents matching the &amp;lt;find&amp;gt; portion of the query.&lt;/p&gt;

&lt;p&gt;The WriteResult given in FCV 3.6 may not accurately reflect a reason (or reflect a reason at all) for why no documents were upserted / modified, especially when upsert is set to true.&lt;/p&gt;</description>
                <environment></environment>
        <key id="420109">SERVER-30822</key>
            <summary>Update does not give an error message when $setOnInsert fails on FCV 3.6</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="13202">Works as Designed</resolution>
                                        <assignee username="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="kimberly.hou">Kimberly Hou</reporter>
                        <labels>
                    </labels>
                <created>Thu, 24 Aug 2017 22:48:24 +0000</created>
                <updated>Fri, 27 Oct 2023 13:54:16 +0000</updated>
                            <resolved>Tue, 5 Sep 2017 14:51:42 +0000</resolved>
                                    <version>3.4.7</version>
                    <version>3.5.12</version>
                                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1664430" author="ian@10gen.com" created="Tue, 5 Sep 2017 14:51:43 +0000"  >&lt;p&gt;Per Tess&apos; comment above this was a bug in 3.4 which was fixed in 3.6 and we are not backporting the fix to 3.4.&lt;/p&gt;</comment>
                            <comment id="1657281" author="tess.avitabile" created="Fri, 25 Aug 2017 15:44:26 +0000"  >&lt;p&gt;This is a bug on 3.4 and 3.6 featureCompatibilityVersion 3.4. We call &lt;tt&gt;prepare()&lt;/tt&gt; on the &lt;tt&gt;ModifierInterface&lt;/tt&gt; for &lt;tt&gt;$setOnInsert&lt;/tt&gt; even in an update context, when we will not apply it. Then if there is a blocking element and the &lt;tt&gt;$setOnInsert&lt;/tt&gt; cannot be applied, we return an error, even though we were not going to apply the &lt;tt&gt;$setOnInsert&lt;/tt&gt;. &lt;a href=&quot;https://github.com/mongodb/mongo/blob/e1f5f40fc17f99fc06dda4621564db7e31be1132/src/mongo/db/ops/update_driver.cpp#L254&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;On 3.4&lt;/a&gt;. &lt;a href=&quot;https://github.com/mongodb/mongo/blob/de15d303ca046b50b2f9112f500b9e041e0a2b63/src/mongo/db/update/update_driver.cpp#L294&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;On 3.6 featureCompatibilityVersion 3.4&lt;/a&gt;.&lt;/p&gt;</comment>
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&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&amp;gt; db.fuzzer.insert({&apos;a&apos;: 1 })&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;WriteResult({ &quot;nInserted&quot; : 1 })&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&amp;gt; db.fuzzer.update({}, {$setOnInsert: {&apos;a.b&apos;: 2 }})&lt;/span&gt;&lt;/pre&gt;
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