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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-14504] Mongos ismaster should return valid wire version range across all shards  </title>
                <link>https://jira.mongodb.org/browse/SERVER-14504</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, drivers determine cluster capabilities based on the mongos ismaster result.  When the mongos has a different version than one or more shards, drivers can issue commands based on the mongos reported wire protocol version that will fail when distributed to shards that don&apos;t support it.&lt;/p&gt;

&lt;p&gt;If a mongos ismaster synthesized wire versions across shards and returned the lowest maxWireVersion and highest minWireVersion between itself and the primary of each shard, that would allow drivers to limit operations to things that will succeed when distributed to shards.&lt;/p&gt;</description>
                <environment></environment>
        <key id="146089">SERVER-14504</key>
            <summary>Mongos ismaster should return valid wire version range across all shards  </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="-1">Unassigned</assignee>
                                    <reporter username="david.golden@mongodb.com">David Golden</reporter>
                        <labels>
                    </labels>
                <created>Tue, 8 Jul 2014 22:03:39 +0000</created>
                <updated>Wed, 10 Dec 2014 23:10:20 +0000</updated>
                            <resolved>Wed, 9 Jul 2014 16:17:42 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="653278" author="david.golden" created="Wed, 9 Jul 2014 16:52:17 +0000"  >&lt;p&gt;I don&apos;t think &quot;works as designed&quot; is the right answer here.&lt;/p&gt;

&lt;p&gt;I understand that mongos is responsible for emulation, but in some cases, it can&apos;t emulate things (e.g. aggregation cursors).  Yet, by reporting a wire protocol range, mongos advertises feature support that it can&apos;t deliver.  Are you saying that was an intentional design decision?&lt;/p&gt;

&lt;p&gt;I think, the &quot;guarantee&quot; issue is a red herring &amp;#8211; even if stale until the next driver heartbeat, an aggregated range would be better than nothing, allowing end-user code to detect capabilities and adjust accordingly.&lt;/p&gt;</comment>
                            <comment id="653274" author="david.golden" created="Wed, 9 Jul 2014 16:51:16 +0000"  >&lt;p&gt;I don&apos;t think &quot;works as designed&quot; is the right answer here.&lt;/p&gt;

&lt;p&gt;I understand that mongos is responsible for emulation, but in some cases, it can&apos;t emulate things (e.g. aggregation cursors).  Yet, by reporting a wire protocol range, mongos advertises feature support that it can&apos;t deliver.  Are you saying that was an intentional design decision?&lt;/p&gt;

&lt;p&gt;I think, the &quot;guarantee&quot; issue is a red herring &amp;#8211; even if stale until the next driver heartbeat, an aggregated range would be better than nothing, allowing end-user code to detect capabilities and adjust accordingly.&lt;/p&gt;</comment>
                            <comment id="653222" author="greg_10gen" created="Wed, 9 Jul 2014 16:17:27 +0000"  >&lt;p&gt;Distributing operations to shards is more complex than this - currently mongos is responsible for emulation when required.  Also there&apos;s no guarantee that the result from any aggregated isMaster will be correct in the future.&lt;/p&gt;

&lt;p&gt;There is a separate discussion to be had about upgrade procedures and whether mongos is the right place to start an upgrade, but probably not here.&lt;/p&gt;</comment>
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