HDFS-17892 RBF: permit not released during invokeConcurrent if getOrderedNamenodes throws an exception

[dParikesit]

JIRA: HDFS-17892

Description of PR

After HDFS-17265, we either move acquirePermit after getOrderedNamenodes or wrap getOrderedNamenodes in a try-finally block so that the permit can be released if getOrderedNamenodes throws an exception.

However, the behavior of the latest trunk (a178eb7) has regressed, where we don't handle the permit release anymore.

The test failed to detect this problem because it only use 1 locations. In invokeConcurrent, the execution flows into invokeSingle where the exception is correctly handled using this branch

else if (locations.size() == 1 && timeOutMs <= 0){      
    // Shortcut, just one call       
    return invokeSingle(locations.iterator().next(), method);     
}

In this patch, I've fixed the invokeConcurrent and the test to reflect this behavior.

How was this patch tested?

mvn -pl hadoop-hdfs-project/hadoop-hdfs-rbf -am -Dtest=TestRouterHandlersFairness#testReleasedWhenExceptionOccurs test

For code changes:

• Does the title or this PR starts with the corresponding JIRA issue id (e.g. 'HADOOP-17799. Your PR title ...')?
• Object storage: have the integration tests been executed and the endpoint declared according to the connector-specific documentation?
• If adding new dependencies to the code, are these dependencies licensed in a way that is compatible for inclusion under ASF 2.0?
• If applicable, have you updated the LICENSE, LICENSE-binary, NOTICE-binary files?

AI Tooling

If an AI tool was used:

• The PR includes the phrase "Contains content generated by "
  where is the name of the AI tool used.
• My use of AI contributions follows the ASF legal policy
  https://www.apache.org/legal/generative-tooling.html

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 0s		Docker mode activated.
-1 ❌	patch	0m 25s		#8345 does not apply to trunk. Rebase required? Wrong Branch? See https://cwiki.apache.org/confluence/display/HADOOP/How+To+Contribute for help.

Subsystem	Report/Notes
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8345/1/console
versions	git=2.34.1
Powered by	Apache Yetus 0.14.1 https://yetus.apache.org

This message was automatically generated.