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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-27030] Improve the error message when issuing a legacy find/getMore on a view</title>
                <link>https://jira.mongodb.org/browse/SERVER-27030</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When performing a legacy find, getMore or killCursors on a view, users get the error message &quot;Namespace &amp;lt;view&amp;gt; is a view, not a collection&quot;. For example, in the shell,&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;&amp;gt; db.getMongo().forceReadMode(&quot;legacy&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;&amp;gt; db.view.find().toArray();&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;2016-11-14T18:52:32.559-0500 E QUERY    [main] Error: error: { &quot;$err&quot; : &quot;Namespace test.view is a view, not a collection&quot;, &quot;code&quot; : 166 } :&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;_getErrorWithCode@src/mongo/shell/utils.js:25:13&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;DBQuery.prototype.next@src/mongo/shell/query.js:309:1&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;DBQuery.prototype.toArray@src/mongo/shell/query.js:338:16&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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-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;@(shell):1:1&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;This is rather unhelpful from a user&apos;s standpoint. We should consider making this error more user-friendly and explicitly state that legacy find and getMore is not supported on a view.&lt;/p&gt;</description>
                <environment></environment>
        <key id="331764">SERVER-27030</key>
            <summary>Improve the error message when issuing a legacy find/getMore on a view</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="james.wahlin@mongodb.com">James Wahlin</assignee>
                                    <reporter username="craig.wilson@mongodb.com">Craig Wilson</reporter>
                        <labels>
                            <label>read-only-views</label>
                    </labels>
                <created>Mon, 14 Nov 2016 21:19:31 +0000</created>
                <updated>Sat, 19 Nov 2016 00:05:49 +0000</updated>
                            <resolved>Wed, 16 Nov 2016 16:34:50 +0000</resolved>
                                    <version>3.4.0-rc3</version>
                                    <fixVersion>3.4.0-rc4</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>13</watches>
                                                                                                                <comments>
                            <comment id="1435678" author="xgen-internal-githook" created="Wed, 16 Nov 2016 16:33:41 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;jameswahlin&apos;, u&apos;name&apos;: u&apos;James Wahlin&apos;, u&apos;email&apos;: u&apos;james.wahlin@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27030&quot; title=&quot;Improve the error message when issuing a legacy find/getMore on a view&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27030&quot;&gt;&lt;del&gt;SERVER-27030&lt;/del&gt;&lt;/a&gt; Improve error for legacy find/getMore on view&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ed347a4f92a3388ab0f690502a81132577361623&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ed347a4f92a3388ab0f690502a81132577361623&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1434787" author="james.wahlin@10gen.com" created="Tue, 15 Nov 2016 18:40:01 +0000"  >&lt;p&gt;Legacy OP_KILL_CURSORS will work against a cursor established on a view. &lt;/p&gt;

&lt;p&gt;We store the underlying collection namespace in the cursor manager. As the legacy kill operation takes only a cursorId, it will map this ID correctly and kill the cursor.&lt;/p&gt;

&lt;p&gt;For the kill cursors command we take a cursorId and the view namespace. This code path has logic to convert the view namespace to the underlying collection namespace so that the requested namespace matches that in the cursor manager.&lt;/p&gt;

&lt;p&gt;Given the above no work is needed for killcursors. This ticket will improve the error message returned for legacy find and getMore.&lt;/p&gt;</comment>
                            <comment id="1433991" author="rassi@10gen.com" created="Tue, 15 Nov 2016 00:21:42 +0000"  >&lt;p&gt;Note that users may get the false impression that they are able to use old drivers (without MongoDB 3.2 support) with views, since aggregation operations against views with these drivers will succeed as long as their results fit within a single batch (101 results or 16MB, by default).  Once they run an aggregation operation where the results exceed a single batch, though (for example, when moving from testing to production), an error will be returned, since the driver will send an incompatible OP_GET_MORE request to fetch the remaining results.&lt;/p&gt;</comment>
                            <comment id="1433965" author="kyle.suarez" created="Mon, 14 Nov 2016 23:50:11 +0000"  >&lt;p&gt;Re-opening this issue to work it into a ticket that improves the error message when running a legacy find or getMore on a view.&lt;/p&gt;</comment>
                            <comment id="1433958" author="behackett" created="Mon, 14 Nov 2016 23:45:44 +0000"  >&lt;p&gt;I guess this means to interact with views a driver has to have explicit support for &amp;gt;= MongoDB 3.2?&lt;/p&gt;</comment>
                            <comment id="1433940" author="kyle.suarez" created="Mon, 14 Nov 2016 23:27:07 +0000"  >&lt;p&gt;This behavior is intended. Per an off-ticket conversation with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=craiggwilson&quot; class=&quot;user-hover&quot; rel=&quot;craiggwilson&quot;&gt;craiggwilson&lt;/a&gt;, the &lt;a href=&quot;https://github.com/mongodb/specifications/blob/master/source/find_getmore_killcursors_commands.rst&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Find/GetMore/KillCursors Drivers Spec&lt;/a&gt; mentions that&lt;/p&gt;

&lt;blockquote&gt;&lt;p&gt;The CRUD API MUST be implemented using the find, getMore and optionally killCursors commands if the isMaster command returns maxWireVersion &amp;gt;= 4.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;So, spec-compliant drivers shouldn&apos;t be issuing OP_GETMORE for CRUD operations on a version of MongoDB that supports read-only views. I&apos;m therefore closing this ticket as Won&apos;t Fix.&lt;/p&gt;</comment>
                    </comments>
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