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    <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-20924] Commands to mongos against SCCC config server results in all servers down</title>
                <link>https://jira.mongodb.org/browse/SERVER-20924</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;if the command has a read preference setting even if they are all up.&lt;/p&gt;

&lt;p&gt;Attached sccc.js that demonstrates this issue.&lt;/p&gt;

&lt;p&gt;The problem appears to be coming from the _lockType helper:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.1.9/src/mongo/client/syncclusterconnection.cpp#L621&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r3.1.9/src/mongo/client/syncclusterconnection.cpp#L621&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;where it tries to determine if the command is a write-type command. It does this by getting the name of the command and appending the help: 1 field.&lt;/p&gt;

&lt;p&gt;The problem comes in when there is a read preference setting and triggers the ServerSelectionMetadata::downconvert code here:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.1.9/src/mongo/client/syncclusterconnection.cpp#L253&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r3.1.9/src/mongo/client/syncclusterconnection.cpp#L253&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;This will result in the command being wrapped around the &apos;query&apos; field; causing the _lockType helper to run the &quot;query&quot; command and fail. The command will fail on all 3 config servers and will ultimately make mongos return the error &quot;all servers down/unreachable when querying&quot;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="234371">SERVER-20924</key>
            <summary>Commands to mongos against SCCC config server results in all servers down</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                    </labels>
                <created>Wed, 14 Oct 2015 19:56:01 +0000</created>
                <updated>Tue, 6 Dec 2022 04:42:08 +0000</updated>
                            <resolved>Mon, 9 Nov 2015 15:30:20 +0000</resolved>
                                    <version>3.1.8</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="1060843" author="renctan" created="Wed, 14 Oct 2015 20:30:36 +0000"  >&lt;p&gt;This is no longer an issue in current master (13b252e73427fbf669efc40a1c8305c8629ca618). This is because the opCommand down-conversion path is no longer exercised. This should be fine since the mongos is the last process that gets upgraded.&lt;/p&gt;</comment>
                    </comments>
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                            <attachment id="94093" name="sccc.js" size="262" author="randolph@mongodb.com" created="Wed, 14 Oct 2015 19:57:12 +0000"/>
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