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    <title>MongoDB Jira</title>
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    <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-6747] Confusing error message when mapReduce() encounters invalid UTF-16 string data in collection</title>
                <link>https://jira.mongodb.org/browse/SERVER-6747</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If you insert invalid UTF-16 text into a string and save it in MongoDB, the database will happily store it, but if you try to run mapReduce() on it, you&apos;ll get one of the following two errors:&lt;/p&gt;

&lt;p&gt;map reduce failed:{&lt;br/&gt;
	&quot;errmsg&quot; : &quot;exception: map invoke failed: JS Error: InternalError: buffer too small (anon):1&quot;,&lt;br/&gt;
	&quot;code&quot; : 9014,&lt;br/&gt;
	&quot;ok&quot; : 0&lt;br/&gt;
}&lt;/p&gt;

&lt;p&gt;map reduce failed:{&lt;br/&gt;
	&quot;errmsg&quot; : &quot;exception: map invoke failed: JS Error: TypeError: bad surrogate character 0x61 (anon):1&quot;,&lt;br/&gt;
	&quot;code&quot; : 9014,&lt;br/&gt;
	&quot;ok&quot; : 0&lt;br/&gt;
}&lt;/p&gt;


&lt;p&gt;Suggested fixes:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Change MongoDB to not accept broken UTF-16 surrogate pairs&lt;/li&gt;
	&lt;li&gt;Print a more informative error message when encountering this&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Reproducable test case attached&lt;/p&gt;</description>
                <environment></environment>
        <key id="46772">SERVER-6747</key>
            <summary>Confusing error message when mapReduce() encounters invalid UTF-16 string data in collection</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="-1">Unassigned</assignee>
                                    <reporter username="william.zola@10gen.com">William Zola</reporter>
                        <labels>
                    </labels>
                <created>Thu, 9 Aug 2012 22:28:07 +0000</created>
                <updated>Thu, 2 Mar 2017 19:30:41 +0000</updated>
                            <resolved>Thu, 2 Mar 2017 19:30:41 +0000</resolved>
                                    <version>2.2.0-rc0</version>
                                                    <component>MapReduce</component>
                                        <votes>2</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1514695" author="milkie" created="Thu, 2 Mar 2017 19:30:41 +0000"  >&lt;p&gt;Inserting invalid UTF-16 text into a string no longer generates an error.&lt;/p&gt;</comment>
                            <comment id="152196" author="tad" created="Fri, 10 Aug 2012 08:32:17 +0000"  >&lt;p&gt;The buffer-too-small error happens when the unpaired surrogate is the last character in the source buffer ... to be legal UTF-16, there would need to be a following UTF-16 code unit, and &quot;the buffer is too small&quot; to contain it.  A bit of overloading of error codes in the SpiderMonkey code ...&lt;/p&gt;</comment>
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