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

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

     [ https://issues.apache.org/jira/browse/HBASE-23040?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sean Busbey resolved HBASE-23040.
---------------------------------
    Fix Version/s: 2.2.2
                   2.1.7
                   2.3.0
                   3.0.0
     Release Note: 
giving the region mover "unload" command a region server name that isn't recognized by the cluster results in a "I don't know about that host" message instead of a NPE.

set log level to DEBUG if you'd like the region mover to log the set of region server names it got back from the cluster.
       Resolution: Fixed

> 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: 3.0.0, 2.1.0, 2.2.0, 2.3.0
>            Reporter: Sean Busbey
>            Assignee: Sean Busbey
>            Priority: Minor
>             Fix For: 3.0.0, 2.3.0, 2.1.7, 2.2.2
>
>
> 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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