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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-61969] Simplify exact_shard_key_target.js so that it does not depend on orphan writing</title>
                <link>https://jira.mongodb.org/browse/SERVER-61969</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As a consequence of PM-2423, write operations to orphan documents have no effect on the actual data, leaving it unchanged on disk and waiting for range deleter to do its job.&lt;/p&gt;

&lt;p&gt;The &lt;tt&gt;exact_shard_key_target.js&lt;/tt&gt; test verifies that shard key targeted update/delete operations go to exactly one shard when targeted&#160;by nested shard keys. This is currently based on explicit insertion of orphan documents, requiring now&#160;&lt;a href=&quot;https://github.com/10gen/mongo/blob/1521a37ec4a89c8661ba2a22c7714d990449da30/jstests/sharding/exact_shard_key_target.js#L41-L48&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;additional logic&lt;/a&gt; to properly handle the new behavior of writes to orphans.&lt;/p&gt;

&lt;p&gt;Evaluate a new implementation in order to achieve the same test&apos;s goals without using orphan documents.&lt;/p&gt;

&lt;p&gt;Refer to this &lt;a href=&quot;https://github.com/10gen/mongo/pull/876#discussion_r764096395&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;comment&lt;/a&gt; for more information on the requirement.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1945731">SERVER-61969</key>
            <summary>Simplify exact_shard_key_target.js so that it does not depend on orphan writing</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="13201">Fixed</resolution>
                                        <assignee username="antonio.fuschetto@mongodb.com">Antonio Fuschetto</assignee>
                                    <reporter username="antonio.fuschetto@mongodb.com">Antonio Fuschetto</reporter>
                        <labels>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Thu, 9 Dec 2021 15:40:19 +0000</created>
                <updated>Sun, 29 Oct 2023 21:45:12 +0000</updated>
                            <resolved>Fri, 7 Jan 2022 11:00:48 +0000</resolved>
                                                    <fixVersion>5.3.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4280049" author="xgen-internal-githook" created="Fri, 7 Jan 2022 10:02:39 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Antonio Fuschetto&apos;, &apos;email&apos;: &apos;antonio.fuschetto@mongodb.com&apos;, &apos;username&apos;: &apos;afuschetto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61969&quot; title=&quot;Simplify exact_shard_key_target.js so that it does not depend on orphan writing&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61969&quot;&gt;&lt;del&gt;SERVER-61969&lt;/del&gt;&lt;/a&gt; Simplify exact_shard_key_target.js so that it does not depend on orphan writing&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1a99f108fe8ef92ac35b66e22e92fa316193504a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1a99f108fe8ef92ac35b66e22e92fa316193504a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4280031" author="JIRAUSER1259062" created="Fri, 7 Jan 2022 09:38:45 +0000"  >&lt;p&gt;We eventually found a third option that allowed us to avoid using orphaned documents in this test.&lt;/p&gt;

&lt;p&gt;Using the &lt;tt&gt;explain&lt;/tt&gt; function in the write operations, we are able to identify the shards actually involved in the operation thus excluding that it is broadcasted to all shards. For example:&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;var explainOutput = coll.explain().remove({a: {b: &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&lt;/span&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;}}, {justOne: &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;true&lt;/span&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;
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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: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;assert&lt;/span&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;.eq(&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&lt;/span&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;, explainOutput.queryPlanner.winningPlan.shards.length);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
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&lt;/div&gt;
&lt;p/&gt;</comment>
                            <comment id="4273302" author="JIRAUSER1259062" created="Tue, 4 Jan 2022 09:16:50 +0000"  >&lt;p&gt;This test verifies that, on sharded collections using nested shard keys, some targeted operations using the object notation (e.g. {&lt;tt&gt;a: {b: 1&lt;/tt&gt;}}) are forwarded to the proper shard. Before MongoDB version 2.6, indeed, this type of operations were improperly broadcasted to all shards (see&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-14138&quot; title=&quot;mongos incorrectly targets multiple shards for nested field shard key predicates&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-14138&quot;&gt;&lt;del&gt;SERVER-14138&lt;/del&gt;&lt;/a&gt;). To test targeted write operations, the test environment needs sharded collections with orphaned documents so that the test can verify these remain unchanged.&lt;/p&gt;

&lt;p&gt;After recent changes to prevent write operations to orphaned documents (see&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-59832&quot; title=&quot;Prevent writes to orphan documents&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-59832&quot;&gt;&lt;del&gt;SERVER-59832&lt;/del&gt;&lt;/a&gt;),&#160;these conditions are equally satisfied regardless of the fix introduced in version 2.6.&lt;/p&gt;

&lt;p&gt;I therefore see two options:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;The&#160;specific tests that verify that orphans are not changed (2 out of 4 tests) could be removed when the feature flag to prevent writes to orphans will be enabled by default. At the present, instead, it could make sense to run these tests (as they are) when the feature flag is disabled.&lt;/li&gt;
	&lt;li&gt;Adapt these 2 tests so that they can work as originally designed with orphaned documents. This means to explicitly remove them after the test run as they have been explicitly inserted.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;In order to preserve the semantic of the test, which also depicts the problem that has been fixed, I opt for the second solution. This also works well taking into account upcoming changes where direct writes to orphans (always allowed) will not generate events on change streams.&lt;/p&gt;</comment>
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