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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-6992] &quot;collection already exists&quot; error misses code</title>
                <link>https://jira.mongodb.org/browse/SERVER-6992</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Creating a duplicate collection is a common error cases that needs a comparison to differentiate real errors from expected behavior, and unfortunately it misses a code at the moment:&lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;LOG&amp;#93;&lt;/span&gt; 37.79905 Socket 0xf84014d540 to localhost:54424: received document: bson.M&lt;/p&gt;
{&quot;ok&quot;:0, &quot;errmsg&quot;:&quot;collection already exists&quot;}</description>
                <environment></environment>
        <key id="50114">SERVER-6992</key>
            <summary>&quot;collection already exists&quot; error misses code</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="kyle.suarez@mongodb.com">Kyle Suarez</assignee>
                                    <reporter username="niemeyer">Gustavo Niemeyer</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Mon, 10 Sep 2012 17:51:57 +0000</created>
                <updated>Wed, 5 Apr 2017 16:44:21 +0000</updated>
                            <resolved>Wed, 26 Oct 2016 14:18:02 +0000</resolved>
                                                                    <component>Diagnostics</component>
                                        <votes>1</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1418109" author="kyle.suarez" created="Wed, 26 Oct 2016 14:18:02 +0000"  >&lt;p&gt;I&apos;m resolving this as Gone Away since in all instances we do include an error code for &quot;collection already exists&quot;: either 17399 or 48, depending on the exact path taken in the code.&lt;/p&gt;</comment>
                            <comment id="1397620" author="ian@10gen.com" created="Fri, 30 Sep 2016 14:57:21 +0000"  >&lt;p&gt;this can probably be resolved once someone checks to confirm that we&apos;re now including an error code.&lt;/p&gt;</comment>
                            <comment id="165419" author="niemeyer" created="Tue, 18 Sep 2012 09:53:22 +0000"  >&lt;p&gt;Consistency is great, but it&apos;s currently sitting at the wrong side.&lt;/p&gt;

&lt;p&gt;As a data point, this is part of the stock documentation for the Node driver:&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;db.createCollection(&apos;test&apos;, function(err, collection) {});&lt;/p&gt;

&lt;p&gt;This command will create the collection on the Mongo DB database before returning the collection object. If the collection already exists it will ignore the creation of the collection.&lt;/p&gt;

&lt;p&gt;db.createCollection(&apos;test&apos;, {safe:true}, function(err, collection) {});&lt;/p&gt;

&lt;p&gt;The {safe:true} option will make the method return an error if the collection already exists.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;In other words, stock documentation is suggesting skipping &lt;em&gt;all errors&lt;/em&gt; and simply assume they know what&apos;s going on.&lt;/p&gt;

&lt;p&gt;Another data point: this is the current create_collection routine of the Ruby driver:&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;
		&lt;tbody &gt;
				&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;      if strict? &amp;amp;&amp;amp; !collection_names.include?(name.to_s)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;        raise Mongo::MongoDBError, &quot;Collection #{name} doesn&apos;t exist. &quot; +&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;Currently in strict mode.&quot;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;      else&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;        opts = opts.dup&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;        opts[:safe] = opts.fetch(:safe, @safe)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;        opts.merge!(:pk =&amp;gt; @pk_factory) unless opts[:pk]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;        Collection.new(name, self, opts)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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-bottom: 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;      end&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;In good faith, it&apos;s attempting to handle the situation internally to clean up the API. Unfortunately, it introduces a race condition in the code that will cause the user logic to explode if the collection happens to be created between the test and the action.&lt;/p&gt;

&lt;p&gt;The root cause for these is lack of information about the error, which forces people to either test for error strings or ignore the error entirely assuming they know what it is, and both of these examples come from experienced MongoDB people. People in the wild are not doing much better.&lt;/p&gt;</comment>
                            <comment id="165328" author="eliot" created="Tue, 18 Sep 2012 04:32:48 +0000"  >&lt;p&gt;No normal command failures have error codes.&lt;br/&gt;
Don&apos;t think this should be special.&lt;/p&gt;</comment>
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