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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-4953] clean/fix exception handling in query plan runners</title>
                <link>https://jira.mongodb.org/browse/SERVER-4953</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We should clean and fix the way query plan runners handle exceptions:&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;An exception that should abort a plan should do so and not set get last error.&lt;/li&gt;
	&lt;li&gt;An exception that should abort a query or an unexpected exception should abort the query, not an individual plan.&lt;/li&gt;
&lt;/ul&gt;


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

&lt;p&gt;We are running with table scans disabled.&lt;/p&gt;

&lt;p&gt;We are seeing a high number of user assertions. After digging through log files we discovered that the query optimizer starts a table scan for some queries when assessing which query path will be fastest. This then causes a user assertion for that path (due to table scans being disabled) but doesn&apos;t actually fail the query.&lt;/p&gt;

&lt;p&gt;The results of the query (and the chosen path) are exactly as expected. The reporting of the user assertion is not. This can make it harder to find real problems.&lt;/p&gt;

&lt;p&gt;When bumping up logging we saw this:&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;Mon Feb 13 14:07:05 [conn103509] runQuery called xxx.content { $query: { _id: ObjectId(&apos;4f2c4757dc37691ee100078f&apos;), _cls: &quot;Content.Post&quot; } }&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;Mon Feb 13 14:07:05 [conn103509]   running multiple plans&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;Mon Feb 13 14:07:05 [conn103509] User Assertion: 10111:table scans not allowed:xxx.content&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;Mon Feb 13 14:07:05 [conn103509]    used cursor: 0x7f6604064cc0&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;Mon Feb 13 14:07:05 [conn103509] query xxx.content ntoreturn:1 nreturned:1 reslen:2089 0ms&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;Thread discussing this is in Google Groups: &lt;a href=&quot;https://groups.google.com/forum/?hl=en&amp;amp;fromgroups#!topic/mongodb-user/CJdPrLmN9zM&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://groups.google.com/forum/?hl=en&amp;amp;fromgroups#!topic/mongodb-user/CJdPrLmN9zM&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="30504">SERVER-4953</key>
            <summary>clean/fix exception handling in query plan runners</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="hari.khalsa@10gen.com">hari.khalsa@10gen.com</assignee>
                                    <reporter username="colinhowe">Colin Howe</reporter>
                        <labels>
                            <label>query_triage</label>
                    </labels>
                <created>Mon, 13 Feb 2012 14:41:52 +0000</created>
                <updated>Mon, 11 Jul 2016 18:32:49 +0000</updated>
                            <resolved>Thu, 2 Jan 2014 20:02:03 +0000</resolved>
                                    <version>2.0.1</version>
                    <version>2.4.8</version>
                                    <fixVersion>2.5.5</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                    <issuelinks>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="31004">SERVER-5016</issuekey>
        </issuelink>
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                                    </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="28217">SERVER-4669</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="80321">SERVER-10026</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="11364">SERVER-666</issuekey>
        </issuelink>
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