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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-12018] Multi-update can update same doc more than once</title>
                <link>https://jira.mongodb.org/browse/SERVER-12018</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If a multi-update yields after updating a document, and that document is moved during the yield (by another update), then it may be retrieved by the update&apos;s query and updated again.&lt;/p&gt;</description>
                <environment></environment>
        <key id="101703">SERVER-12018</key>
            <summary>Multi-update can update same doc more than once</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="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="scotthernandez">Scott Hernandez</reporter>
                        <labels>
                            <label>query-44-grooming</label>
                    </labels>
                <created>Mon, 9 Dec 2013 19:52:30 +0000</created>
                <updated>Tue, 6 Dec 2022 05:14:02 +0000</updated>
                            <resolved>Mon, 8 Jul 2019 15:40:53 +0000</resolved>
                                                                    <component>Querying</component>
                    <component>Write Ops</component>
                                        <votes>1</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="2315377" author="craig.homa" created="Mon, 8 Jul 2019 15:40:53 +0000"  >&lt;p&gt;This can happen by design in the absence of &lt;a href=&quot;https://docs.mongodb.com/manual/core/write-operations-atomicity/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;multi document transactions&lt;/a&gt;. &lt;/p&gt;</comment>
                            <comment id="2313773" author="david.storch" created="Fri, 5 Jul 2019 19:06:41 +0000"  >&lt;p&gt;Flagging for re-triage. Now that we support multi-document transactions, I don&apos;t think the query team should enhance the guarantees around multi-updates run outside of transactions.&lt;/p&gt;</comment>
                            <comment id="578896" author="rassi@10gen.com" created="Fri, 9 May 2014 23:48:44 +0000"  >&lt;p&gt;Verified attached test fails against 2.6.1.&lt;/p&gt;</comment>
                            <comment id="468289" author="rassi@10gen.com" created="Tue, 10 Dec 2013 00:51:29 +0000"  >&lt;blockquote&gt;&lt;p&gt;The main downside is that now moves are O(number of active cursors on ns).&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;No, there is no downside here: move already calls invalidate on all of the namespace&apos;s active cursors.&lt;/p&gt;</comment>
                            <comment id="468268" author="redbeard0531" created="Tue, 10 Dec 2013 00:14:38 +0000"  >&lt;p&gt;Discussed solution:&lt;/p&gt;

&lt;p&gt;Have Runners maintain a single set of seen DiskLocs per cursor (currently there are several). Add a method to Runner, similar to invalidate to notify runners when documents are moved. If a runner had seen the old loc, it would remove it from its seen set and add the new loc. I think this could also replace the custom seen set used by update that only tracks moves local to the current operation. This would also provide a more efficient implementation of snapshot cursors.&lt;/p&gt;

&lt;p&gt;The main downside is that now moves are O(number of active cursors on ns). This could be mitigated by making this an opt-in feature of cursors only used for multi-updates and snapshot cursors since there won&apos;t be many of those active at once.&lt;/p&gt;</comment>
                            <comment id="468076" author="scotthernandez" created="Mon, 9 Dec 2013 20:31:26 +0000"  >&lt;p&gt;Attached is a test which shows the behavior on both 2.4.x and 2.5.x.  &lt;/p&gt;

&lt;p&gt;Here is the ouput:&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;sh93722| MongoDB shell version: 2.4.8&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;sh93722| connecting to: 127.0.0.1/admin&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;***********************************************&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;assert: [4] != [1] are not equal : had too many distinct values for x: [ 1, 2, 3, 4 ]&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;Error: Printing Stack Trace&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;    at printStackTrace (src/mongo/shell/utils.js:37:15)&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;    at doassert (src/mongo/shell/assert.js:6:5)&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;    at Function.assert.eq (src/mongo/shell/assert.js:32:5)&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;    at ./mongo/jstests/update_only_once_on_move.js:20:12&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 Dec  9 15:26:21.947 [4] != [1] are not equal : had too many distinct values for x: [ 1, 2, 3, 4 ] at src/mongo/shell/assert.js:7&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;failed to load: ./mongo/jstests/update_only_once_on_move.js&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>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="38435">SERVER-5820</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="182469">SERVER-17174</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                    </issuelinks>
                <attachments>
                            <attachment id="35150" name="update_only_once_on_move.js" size="791" author="scotthernandez" created="Mon, 9 Dec 2013 20:31:26 +0000"/>
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