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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-21661] v3.0 mongos and v3.2 cluster explain command are not compatible</title>
                <link>https://jira.mongodb.org/browse/SERVER-21661</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Some incompatibility observed include:&lt;/p&gt;

&lt;p&gt;1. Using v3.2 shell on v3.0 mongos can cause the mongos to ignore the read preference setting. This is because the read preference setting used to be inside the explain subdocument in v3.0 and is now moved to the top level in v3.2.&lt;/p&gt;

&lt;p&gt;2. Using v3.0 shell and v3.0 mongos with v3.2 shards to run an explain with slaveOk will result in:&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;{&lt;/span&gt;&lt;/pre&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;	&quot;ok&quot; : 0,&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;	&quot;errmsg&quot; : &quot;Failed to parse options: { slaveOk: true }. You may need to update your shell or driver.&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;
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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;   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;}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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			&lt;/tbody&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="240990">SERVER-21661</key>
            <summary>v3.0 mongos and v3.2 cluster explain command are not compatible</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                    </labels>
                <created>Tue, 24 Nov 2015 20:26:26 +0000</created>
                <updated>Tue, 14 Mar 2017 13:57:42 +0000</updated>
                            <resolved>Tue, 22 Dec 2015 17:18:26 +0000</resolved>
                                    <version>3.2.0-rc3</version>
                                                    <component>Querying</component>
                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1120698" author="david.storch" created="Tue, 22 Dec 2015 17:18:26 +0000"  >&lt;p&gt;After further discussion, we have decided to close this issue as &quot;Won&apos;t Fix&quot;. The format changes made to $readPreference and the find command during the 3.2 cycle were made knowing that this could cause some compatibility problems in mixed version scenarios. Our assessment was that these compatibility problems would not arise in common use cases. If we find that mixed version explain using readPreference or slaveOk is an important configuration to support, we can re-open this ticket and provide a fix.&lt;/p&gt;</comment>
                            <comment id="1100179" author="david.storch" created="Sun, 29 Nov 2015 20:45:43 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=renctan&quot; class=&quot;user-hover&quot; rel=&quot;renctan&quot;&gt;renctan&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=spencer&quot; class=&quot;user-hover&quot; rel=&quot;spencer&quot;&gt;spencer&lt;/a&gt;, we did intentionally change how the shell passes read preference to mongos for explain. In 3.0, there is a special format for attaching read preference to explain; specifically, the read preference goes inside the find command itself:&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;{explain: {find: &quot;collection&quot;, $readPreference: {...}}}&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;In 3.2, read preference for explain is just like read preference for any other command. We use the &quot;wrapped&quot; command form:&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;{$query: {explain: {find: &quot;collection&quot;}}, $readPreference: {...}}&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 change was intentional in order to make read preference handling consistent for all commands. However, we still may want to fix problem #1. The likely approach for the fix would be to write compatibility code in the shell. If a 3.2 shell detects that it sending an explain command to a 3.0 mongos, it should use the deprecated read preference format that a 3.0 mongos can understand.&lt;/p&gt;</comment>
                            <comment id="1097610" author="renctan" created="Tue, 24 Nov 2015 20:55:04 +0000"  >&lt;p&gt;Based on my last discussion with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=david.storch&quot; class=&quot;user-hover&quot; rel=&quot;david.storch&quot;&gt;david.storch&lt;/a&gt;, it sounded like #1 was an intentional design decision.&lt;/p&gt;</comment>
                            <comment id="1097605" author="rassi@10gen.com" created="Tue, 24 Nov 2015 20:52:42 +0000"  >&lt;p&gt;If we decide to fix #1, we may also want to fix related ticket &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20236&quot; title=&quot;Read preference for an explain routed through mongos does not work on 3.0 for explain-of-count and explain-of-group&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20236&quot;&gt;&lt;del&gt;SERVER-20236&lt;/del&gt;&lt;/a&gt; (an outstanding issue with v3.0 mongos ignoring read preference for explain of operations other than find).&lt;/p&gt;</comment>
                            <comment id="1097595" author="spencer" created="Tue, 24 Nov 2015 20:45:12 +0000"  >&lt;p&gt;Per offline discussion #2 above was previously considered and deemed to be acceptable behavior.&lt;/p&gt;

&lt;p&gt;#1, however, is a bug that we should fix for 3.2.1&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10320">
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                                                                <inwardlinks description="is documented by">
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            <issuekey id="227923">SERVER-20236</issuekey>
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            <issuekey id="240440">SERVER-21586</issuekey>
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