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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>
    </build-info>


<item>
            <title>[CDRIVER-2817] Are duplicates for all URI options parsed consistently?</title>
                <link>https://jira.mongodb.org/browse/CDRIVER-2817</link>
                <project id="10030" key="CDRIVER">C Driver</project>
                    <description>&lt;p&gt;If the same option appears multiple times in a connection string (e.g. &lt;tt&gt;connectTimeoutMS&lt;/tt&gt;) with either the same or different spellings, how is its value stored and later retrieved? Does the last occurrence always take precedence?&lt;/p&gt;

&lt;p&gt;Furthermore, is behavior consistent for special URI options that may a struct field (e.g. auth or SSL options) and generic options that set a key in the &lt;tt&gt;bson_t&lt;/tt&gt; within a URI struct and are later looked up with a generic get method (e.g. &lt;tt&gt;connectTimeoutMS&lt;/tt&gt;)?&lt;/p&gt;

&lt;p&gt;For context, the &lt;a href=&quot;https://github.com/mongodb/specifications/blob/master/source/connection-string/connection-string-spec.rst&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;connection string spec&lt;/a&gt; states:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;Keys are strings and the character case must be normalized by lower casing the uppercase ASCII characters A through Z; other characters are left as-is. (&lt;a href=&quot;https://github.com/mongodb/specifications/blob/master/source/connection-string/connection-string-spec.rst#keys&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;source&lt;/a&gt;)&lt;/li&gt;
	&lt;li&gt;If a key is repeated and the corresponding data type is not a List then the precedence of which key value pair will be used is undefined. Where possible, a warning SHOULD be raised to inform the user that multiple options were found for the same value. (&lt;a href=&quot;https://github.com/mongodb/specifications/blob/master/source/connection-string/connection-string-spec.rst#repeated-keys&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;source&lt;/a&gt;)&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="601223">CDRIVER-2817</key>
            <summary>Are duplicates for all URI options parsed consistently?</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="13201">Fixed</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="jmikola@mongodb.com">Jeremy Mikola</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Fri, 7 Sep 2018 15:50:42 +0000</created>
                <updated>Sat, 28 Oct 2023 11:29:36 +0000</updated>
                            <resolved>Fri, 21 Sep 2018 14:18:52 +0000</resolved>
                                                    <fixVersion>1.14.0</fixVersion>
                                    <component>docs</component>
                    <component>uri</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2010338" author="xgen-internal-githook" created="Fri, 21 Sep 2018 14:12:16 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kevin Albertson&apos;, &apos;email&apos;: &apos;kevin.albertson@10gen.com&apos;, &apos;username&apos;: &apos;kevinAlbs&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/CDRIVER-2817&quot; title=&quot;Are duplicates for all URI options parsed consistently?&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CDRIVER-2817&quot;&gt;&lt;del&gt;CDRIVER-2817&lt;/del&gt;&lt;/a&gt; do not add compressors twice&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-c-driver/commit/67e3e5215e8cdd05c8116862cd839eee60444fe6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-c-driver/commit/67e3e5215e8cdd05c8116862cd839eee60444fe6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2009784" author="xgen-internal-githook" created="Thu, 20 Sep 2018 20:33:19 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kevin Albertson&apos;, &apos;email&apos;: &apos;kevin.albertson@10gen.com&apos;, &apos;username&apos;: &apos;kevinAlbs&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/CDRIVER-2817&quot; title=&quot;Are duplicates for all URI options parsed consistently?&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CDRIVER-2817&quot;&gt;&lt;del&gt;CDRIVER-2817&lt;/del&gt;&lt;/a&gt; test duplicate uri opts&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-c-driver/commit/cb7b6ec80f4615e8d893e959d9379434a9a787d0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-c-driver/commit/cb7b6ec80f4615e8d893e959d9379434a9a787d0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2002533" author="kevin.albertson" created="Thu, 13 Sep 2018 21:51:10 +0000"  >&lt;p&gt;We make an effort to replace the existing value when parsing a duplicate option.&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;   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;mongodb://localhost:27017/test?w=0&amp;amp;w=1&amp;amp;w=2&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;Uses &quot;w=2&quot;. We also log a warning every time we overwrite w:&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;   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;2018/09/13 16:04:30.0570: [18947]:  WARNING:       mongoc: Overwriting previously provided value for &apos;w&apos;&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;So for most cases, the last value takes precedence. The helper functions which set the option on the mongoc_uri_t&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;_mongoc_uri_set_option_as_int32&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;_mongoc_uri_set_option_as_bool&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;mongoc_uri_bson_append_or_replace_key&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;Attempt to replace the option value whenever seeing a duplicate.&lt;/p&gt;

&lt;p&gt;However, in digging around there seems to be at least some exceptions. For instance, a string value for &quot;w&quot; will replace an integer value for &quot;w&quot; but not vice-versa:&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;   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;mongodb://localhost:27017/test?w=0&amp;amp;w=majority&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;Uses w=majority&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;   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;mongodb://localhost:27017/test?w=majority&amp;amp;w=0&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;Uses w=majority (but should use w=0 for consistency)&lt;/p&gt;

&lt;p&gt;Repeated readpreferencetags don&apos;t overwrite, but instead get appended&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;   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;mongodb://localhost:27017/test?readpreference=secondary&amp;amp;readpreferencetags=a:1&amp;amp;readpreferencetags=b:1&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;Sets the tags to &lt;tt&gt;a:1, b:1&lt;/tt&gt;&lt;/p&gt;

&lt;p&gt;I haven&apos;t tested all cases, but I think these are the only exceptions.&lt;/p&gt;</comment>
                            <comment id="2002265" author="jesse" created="Thu, 13 Sep 2018 18:45:17 +0000"  >&lt;p&gt;To close this ticket, answer the question here and note in an appropriate place in the docs that repeated values have undefined behavior.&lt;/p&gt;</comment>
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