[jira] [Created] (HBASE-23040) region mover gives NullPointerException instead of saying a host isn't in the cluster

["Sean Busbey (Jira)" <ji...@apache.org>]

Sean Busbey created HBASE-23040:
-----------------------------------

             Summary: region mover gives NullPointerException instead of saying a host isn't in the cluster
                 Key: HBASE-23040
                 URL: https://issues.apache.org/jira/browse/HBASE-23040
             Project: HBase
          Issue Type: Bug
    Affects Versions: 2.2.0, 2.1.0, 3.0.0, 2.3.0
            Reporter: Sean Busbey


if passed a host that isn't in the cluster we get a NPE

{code}
2019-09-17 21:50:45,595 ERROR [pool-2-thread-1] util.RegionMover: Error while unloading regions 
java.lang.NullPointerException: serverName is null
	at org.apache.hbase.thirdparty.com.google.common.base.Preconditions.checkNotNull(Preconditions.java:897)
	at org.apache.hadoop.hbase.client.AsyncRpcRetryingCallerFactory$AdminRequestCallerBuilder.build(AsyncRpcRetryingCallerFactory.java:518)
	at org.apache.hadoop.hbase.client.AsyncRpcRetryingCallerFactory$AdminRequestCallerBuilder.call(AsyncRpcRetryingCallerFactory.java:522)
	at org.apache.hadoop.hbase.client.RawAsyncHBaseAdmin.getRegions(RawAsyncHBaseAdmin.java:842)
	at org.apache.hadoop.hbase.client.AdminOverAsyncAdmin.getRegions(AdminOverAsyncAdmin.java:229)
	at org.apache.hadoop.hbase.util.RegionMover.unloadRegions(RegionMover.java:448)
	at org.apache.hadoop.hbase.util.RegionMover.lambda$unload$1(RegionMover.java:431)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)

{code}

Should instead give some kind of "I don't know what this host is 'foobar.example.com'" and maybe a debug message with what hosts were in the cluster.



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