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

[Sean Busbey (Jira)]

    [ 
https://issues.apache.org/jira/browse/HBASE-23040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16932010#comment-16932010
 ] 

Sean Busbey commented on HBASE-23040:
-------------------------------------

branch-2.1 version looks like this
{code}
19/09/18 02:01:58 ERROR util.RegionMover: Error while unloading regions 
java.lang.NullPointerException
        at 
org.apache.hadoop.hbase.client.ConnectionUtils.getStubKey(ConnectionUtils.java:232)
        at 
org.apache.hadoop.hbase.client.ConnectionImplementation.getAdmin(ConnectionImplementation.java:1195)
        at 
org.apache.hadoop.hbase.client.HBaseAdmin.getRegions(HBaseAdmin.java:397)
        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)
19/09/18 02:01:58 INFO client.ConnectionImplementation: Closing master 
protocol: MasterService
{code}

> 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
>
> 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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