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https://issues.apache.org/jira/browse/HDFS-9478?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Junping Du updated HDFS-9478:
-----------------------------
    Fix Version/s: 2.8.0

> Reason for failing ipc.FairCallQueue contruction should be thrown
> -----------------------------------------------------------------
>
>                 Key: HDFS-9478
>                 URL: https://issues.apache.org/jira/browse/HDFS-9478
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Archana T
>            Assignee: Ajith S
>            Priority: Minor
>             Fix For: 2.8.0, 2.7.3, 3.0.0-alpha1
>
>         Attachments: HDFS-9478.2.patch, HDFS-9478.3.patch, HDFS-9478.patch
>
>
> 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.



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