[HDFS-9478] Reason for failing ipc.FairCallQueue contruction should be thrown

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 2.8.0, 2.7.3, 3.0.0-alpha1
• Hadoop Flags: Reviewed
• Assignee: Ajith S
• Reporter: Archana T
• Created: 30/Nov/15 10:27
• Updated: 06/Jan/17 07:42
• Resolved: 29/Mar/16 20:11

Description

When FairCallQueue Construction fails, NN fails to start throwing RunTimeException without throwing any reason on why it fails.

2015-11-30 17:45:26,661 INFO org.apache.hadoop.ipc.FairCallQueue: FairCallQueue is in use with 4 queues.
2015-11-30 17:45:26,665 DEBUG org.apache.hadoop.metrics2.util.MBeans: Registered Hadoop:service=ipc.65110,name=DecayRpcScheduler
2015-11-30 17:45:26,666 ERROR org.apache.hadoop.hdfs.server.namenode.NameNode: Failed to start namenode.
java.lang.RuntimeException: org.apache.hadoop.ipc.FairCallQueue could not be constructed.
at org.apache.hadoop.ipc.CallQueueManager.createCallQueueInstance(CallQueueManager.java:96)
at org.apache.hadoop.ipc.CallQueueManager.<init>(CallQueueManager.java:55)
at org.apache.hadoop.ipc.Server.<init>(Server.java:2241)
at org.apache.hadoop.ipc.RPC$Server.<init>(RPC.java:942)
at org.apache.hadoop.ipc.ProtobufRpcEngine$Server.<init>(ProtobufRpcEngine.java:534)
at org.apache.hadoop.ipc.ProtobufRpcEngine.getServer(ProtobufRpcEngine.java:509)
at org.apache.hadoop.ipc.RPC$Builder.build(RPC.java:784)
at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.<init>(NameNodeRpcServer.java:346)
at org.apache.hadoop.hdfs.server.namenode.NameNode.createRpcServer(NameNode.java:750)
at org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:687)
at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:889)
at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:872)

Example: reason for above failure could have been –
1. the weights were not equal to the number of queues configured.
2. decay-scheduler.thresholds not in sync with number of queues.