Abhishek Singh Chouhan created HBASE-20139:
----------------------------------------------

             Summary: NPE in RSRpcServices.get() when getRegion throws an 
exception
                 Key: HBASE-20139
                 URL: https://issues.apache.org/jira/browse/HBASE-20139
             Project: HBase
          Issue Type: Bug
    Affects Versions: 1.3.1
            Reporter: Abhishek Singh Chouhan
            Assignee: Abhishek Singh Chouhan
             Fix For: 1.3.2, 1.5.0, 1.4.3


We can get a NPE in RsRpcServices at 
{code:java}
} finally {
if (regionServer.metricsRegionServer != null) {
regionServer.metricsRegionServer.updateGet(
-> region.getTableDesc().getTableName(), EnvironmentEdgeManager.currentTime() - 
before);
}
if (quota != null) {
quota.close();
}{code}
when region itself is null which might happen when getRegion throws an 
exception, this is then sent back to the client which is not able to handle 
this/make sense of it.
{code:java}
2018-03-06 08:31:25,100 DEBUG [0,queue=4,port=60020] ipc.RpcServer - 
RpcServer.FifoWFPBQ.default.handler=30,queue=4,port=60020: callId: 5605567 
service: ClientService methodName: Get size: 79 connection: xyz:58736 deadline: 
9223372036854775807
java.io.IOException
        at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2431)
        at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:124)
        at 
org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:188)
        at 
org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:168)
Caused by: java.lang.NullPointerException
        at 
org.apache.hadoop.hbase.regionserver.RSRpcServices.get(RSRpcServices.java:2246)
        at 
org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:35068)
        at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2373)
        ... 3 more{code}
This has been fixed by [~stack] over at HBASE-18946 for master, backporting the 
same to branch-1, 1.3 and 1.4



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