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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-20263] Use maxWireVersion 5 for OP_COMMAND</title>
                <link>https://jira.mongodb.org/browse/SERVER-20263</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If I interpret [this comment|https://github.com/mongodb/mongo/blob/dd15f9c211f5bc40b6fa8a7cd44350d3aeb87d89/src/mongo/db/wire_version.h#L59} correctly:&lt;/p&gt;
&lt;p/&gt;
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&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;
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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-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;enum WireVersion {&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;    // ... &amp;lt;snip&amp;gt; ...&lt;/span&gt;&lt;/pre&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;    // Support find and getMore commands, as well as OP_COMMAND in mongod (but not mongos).&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;    FIND_COMMAND = 4,&lt;/span&gt;&lt;/pre&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;
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&lt;p/&gt;
&lt;p&gt;... then we can use wire version to know whether find and getMore commands will succeed, but we can&apos;t use wire version to know whether OP_COMMAND will succeed. Instead, we must do something like&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;
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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-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;if maxWireVersion &amp;gt;= 4 and &quot;msg: isdbgrid&quot; not in ismaster response:&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;   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;    use OP_COMMAND&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
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&lt;p/&gt;
&lt;p&gt;That seems needlessly inelegant. Let&apos;s bump maxWireVersion to 5 if and only if OP_COMMAND is supported.&lt;/p&gt;</description>
                <environment></environment>
        <key id="228172">SERVER-20263</key>
            <summary>Use maxWireVersion 5 for OP_COMMAND</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="9">Done</resolution>
                                        <assignee username="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="jesse@mongodb.com">A. Jesse Jiryu Davis</reporter>
                        <labels>
                    </labels>
                <created>Wed, 2 Sep 2015 17:24:55 +0000</created>
                <updated>Tue, 6 Dec 2022 04:45:10 +0000</updated>
                            <resolved>Thu, 2 Jun 2016 15:54:43 +0000</resolved>
                                                                    <component>Networking</component>
                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="1282495" author="schwerin" created="Thu, 2 Jun 2016 15:54:43 +0000"  >&lt;p&gt;OP_CMD remains only for use in communication among cluster members, so clients should not at present attempt to use OP_CMD regardless of wire version.&lt;/p&gt;</comment>
                            <comment id="1020890" author="david.storch" created="Wed, 2 Sep 2015 17:49:33 +0000"  >&lt;p&gt;Yes, my understanding is that drivers should not implement OP_COMMAND for 3.2 and also that we will bump the wire version when we have full, no-longer-experimental OP_COMMAND support.&lt;/p&gt;</comment>
                            <comment id="1020863" author="jesse" created="Wed, 2 Sep 2015 17:35:59 +0000"  >&lt;p&gt;By experimental feature, you mean drivers won&apos;t actually use it? In that case we can let this be until we decide that drivers &lt;b&gt;do&lt;/b&gt; use it, at which point I&apos;d request a wire version bump.&lt;/p&gt;</comment>
                            <comment id="1020857" author="david.storch" created="Wed, 2 Sep 2015 17:30:08 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jesse&quot; class=&quot;user-hover&quot; rel=&quot;jesse&quot;&gt;jesse&lt;/a&gt;, my understanding is the same as yours. I believe the thinking is that since OP_COMMAND is an experimental feature, drivers won&apos;t have to do the inelegant wire version + isdbgrid check. I guess we also deem it unnecessary to bump the wire version for an experimental feature.&lt;/p&gt;</comment>
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