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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>[SERVER-6835] Sharding edge case upserts documents with multiple _id attributes</title>
                <link>https://jira.mongodb.org/browse/SERVER-6835</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;we have a large collection with a shard key on &lt;tt&gt;_id.c&lt;/tt&gt;, example &lt;p/&gt;
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&lt;p/&gt;.  When performing upserts we found that passing a query of _id alone resulted in the query being broadcast. to address this waste of work (waste for all but 1 shard), we changed the query of the upsert to &lt;p/&gt;
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&lt;p/&gt;. this did properly route the upsert to the appropriate shard. it appears that with this configuration, if a document already exists based on _id, the update works fine. when the document needs to be created, mongodb mistakenly injects two _id attributes into the new document. we will see exactly what was provided in the query:&lt;/p&gt;

&lt;p/&gt;
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&lt;p/&gt;

&lt;p&gt;This probably should not occur. a side effect is that any driver which parses this document will either take the first occurrence of the attribute or the last one. the PHP driver takes the last one, resulting in an incomplete _id value.&lt;/p&gt;

&lt;p&gt;The mongo shell does not output these documents correctly because of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-718&quot; title=&quot;in JS shell, duplicated fields should print correctly&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-718&quot;&gt;&lt;del&gt;SERVER-718&lt;/del&gt;&lt;/a&gt; (duplicate fields just repeat the first).&lt;/p&gt;

&lt;p/&gt;
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&lt;p/&gt;</description>
                <environment>ubuntu 10.04lts on x86_64; sharded configuration where each shard is a replicaset</environment>
        <key id="47961">SERVER-6835</key>
            <summary>Sharding edge case upserts documents with multiple _id attributes</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="9">Done</resolution>
                                        <assignee username="scotthernandez">Scott Hernandez</assignee>
                                    <reporter username="wayne530">Y. Wayne Huang</reporter>
                        <labels>
                            <label>logic</label>
                            <label>schema</label>
                            <label>sharding</label>
                    </labels>
                <created>Thu, 23 Aug 2012 15:34:46 +0000</created>
                <updated>Mon, 11 Jul 2016 17:58:39 +0000</updated>
                            <resolved>Thu, 14 Nov 2013 04:37:04 +0000</resolved>
                                    <version>2.0.7</version>
                                    <fixVersion>2.5.4</fixVersion>
                                    <component>Sharding</component>
                    <component>Shell</component>
                    <component>Usability</component>
                    <component>Write Ops</component>
                                        <votes>1</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="456249" author="xgen-internal-githook" created="Thu, 14 Nov 2013 17:09:42 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;scotthernandez&apos;, u&apos;name&apos;: u&apos;Scott Hernandez&apos;, u&apos;email&apos;: u&apos;scotthernandez@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6835&quot; title=&quot;Sharding edge case upserts documents with multiple _id attributes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6835&quot;&gt;&lt;del&gt;SERVER-6835&lt;/del&gt;&lt;/a&gt;: removed extra, and erroring line&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3f60ef6360fb18ccf6d32df89639071e7076b1af&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3f60ef6360fb18ccf6d32df89639071e7076b1af&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="455954" author="xgen-internal-githook" created="Thu, 14 Nov 2013 00:30:31 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;scotthernandez&apos;, u&apos;name&apos;: u&apos;Scott Hernandez&apos;, u&apos;email&apos;: u&apos;scotthernandez@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-11531&quot; title=&quot;Cannot $rename to/from an array field&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-11531&quot;&gt;&lt;del&gt;SERVER-11531&lt;/del&gt;&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-10489&quot; title=&quot;Move okForStorage checks till after in-mem update, but before persistence&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-10489&quot;&gt;&lt;del&gt;SERVER-10489&lt;/del&gt;&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6835&quot; title=&quot;Sharding edge case upserts documents with multiple _id attributes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6835&quot;&gt;&lt;del&gt;SERVER-6835&lt;/del&gt;&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-4830&quot; title=&quot;Reject upsert if would create duplicate field names&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-4830&quot;&gt;&lt;del&gt;SERVER-4830&lt;/del&gt;&lt;/a&gt;: Refactor update system to support immutable fields, consolodate storage validation, and misc issues.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b98712c551e8ab27c33e1a5e7c694fa36c3334ce&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b98712c551e8ab27c33e1a5e7c694fa36c3334ce&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="378147" author="rebond" created="Wed, 10 Jul 2013 16:50:03 +0000"  >&lt;p&gt;I&apos;m also running into this issue - and resorted to making this query for the same reason (i.e., that indexes/shard keys are not leveraged for inner keys of a composite key)&lt;br/&gt;
I have a repro. It doesn&apos;t require that the collection be sharded.&lt;/p&gt;
&lt;p/&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;   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;db.repro.update({&quot;_id.shardKey&quot;: 1, &quot;_id&quot;: {shardKey: 1, uniquifier: 1}}, { $setOnInsert: { payload: 1 }}, { upsert: true })&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;db.repro.find()&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;Produces this output - note the duplicate, identical _id fields. This crashes the C# 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;   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;{ &quot;_id&quot; : { &quot;shardKey&quot; : 1, &quot;uniquifier&quot; : 1 }, &quot;_id&quot; : { &quot;shardKey&quot; : 1, &quot;uniquifier&quot; : 1 }, &quot;payload&quot; : 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;</comment>
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