[HDFS-13410] RBF: Support federation with no subclusters

• Type: Sub-task
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.0.0
• Fix Version/s: 2.10.0, 3.2.0, 3.1.1, 2.9.2, 3.0.3
• Target Version/s: 3.2.0, 3.1.1
• Hadoop Flags: Reviewed
• Assignee: Íñigo Goiri
• Reporter: Íñigo Goiri
• Created: 08/Apr/18 00:06
• Updated: 09/May/18 05:05
• Resolved: 10/Apr/18 06:53

Description

If the federation has no subclusters the logs have long stack traces. Even though this is not a regular setup for RBF, we should trigger log message.

An example:

Caused by: java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
	at java.util.LinkedList.checkElementIndex(LinkedList.java:555)
	at java.util.LinkedList.get(LinkedList.java:476)
	at org.apache.hadoop.hdfs.server.federation.router.RouterRpcClient.invokeConcurrent(RouterRpcClient.java:1028)
	at org.apache.hadoop.hdfs.server.federation.router.RouterRpcServer.getDatanodeReport(RouterRpcServer.java:1264)
	at org.apache.hadoop.hdfs.server.federation.metrics.FederationMetrics.getNodeUsage(FederationMetrics.java:424)

Issue Links

• is related to: HDFS-13384 RBF: Improve timeout RPC call mechanism