Duo Zhang created HBASE-22477:
---------------------------------

             Summary: Throwing exception when meta region is not in OPEN state 
in client registry may crash a naster
                 Key: HBASE-22477
                 URL: https://issues.apache.org/jira/browse/HBASE-22477
             Project: HBase
          Issue Type: Bug
          Components: Client, master, meta
            Reporter: Duo Zhang


{noformat}
2019-05-26 17:10:31,195 ERROR [master/asf906:0:becomeActiveMaster] 
helpers.MarkerIgnoringBase(159): Failed to become active master
org.apache.hadoop.hbase.client.RetriesExhaustedException: Cannot get the 
location for replica0 of region for  in hbase:meta
        at 
org.apache.hadoop.hbase.client.RpcRetryingCallerWithReadReplicas.getRegionLocations(RpcRetryingCallerWithReadReplicas.java:335)
        at 
org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.call(ScannerCallableWithReplicas.java:153)
        at 
org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.call(ScannerCallableWithReplicas.java:58)
        at 
org.apache.hadoop.hbase.client.RpcRetryingCallerImpl.callWithoutRetries(RpcRetryingCallerImpl.java:192)
        at 
org.apache.hadoop.hbase.client.ClientScanner.call(ClientScanner.java:263)
        at 
org.apache.hadoop.hbase.client.ClientScanner.loadCache(ClientScanner.java:405)
        at 
org.apache.hadoop.hbase.client.ClientScanner.nextWithSyncCache(ClientScanner.java:285)
        at 
org.apache.hadoop.hbase.client.ClientScanner.next(ClientScanner.java:564)
        at 
org.apache.hadoop.hbase.MetaTableAccessor.scanMeta(MetaTableAccessor.java:766)
        at 
org.apache.hadoop.hbase.MetaTableAccessor.scanMeta(MetaTableAccessor.java:734)
        at 
org.apache.hadoop.hbase.MetaTableAccessor.scanMeta(MetaTableAccessor.java:690)
        at 
org.apache.hadoop.hbase.MetaTableAccessor.fullScanRegions(MetaTableAccessor.java:220)
        at 
org.apache.hadoop.hbase.master.assignment.RegionStateStore.visitMeta(RegionStateStore.java:77)
        at 
org.apache.hadoop.hbase.master.assignment.AssignmentManager.loadMeta(AssignmentManager.java:1294)
        at 
org.apache.hadoop.hbase.master.assignment.AssignmentManager.joinCluster(AssignmentManager.java:1255)
        at 
org.apache.hadoop.hbase.master.HMaster.finishActiveMasterInitialization(HMaster.java:1100)
        at 
org.apache.hadoop.hbase.master.HMaster.startActiveMasterManager(HMaster.java:2375)
        at org.apache.hadoop.hbase.master.HMaster.lambda$run$0(HMaster.java:605)
        at java.lang.Thread.run(Thread.java:748)
Caused by: java.io.IOException: Meta region is in state OPENING
        at 
org.apache.hadoop.hbase.client.ZKAsyncRegistry.lambda$getMetaRegionLocation$1(ZKAsyncRegistry.java:162)
        at 
org.apache.hadoop.hbase.util.FutureUtils.lambda$addListener$0(FutureUtils.java:70)
        at 
java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:760)
        at 
java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(CompletableFuture.java:736)
        at 
java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:474)
        at 
java.util.concurrent.CompletableFuture.complete(CompletableFuture.java:1962)
        at 
org.apache.hadoop.hbase.client.ZKAsyncRegistry.lambda$getAndConvert$0(ZKAsyncRegistry.java:81)
        at 
org.apache.hadoop.hbase.util.FutureUtils.lambda$addListener$0(FutureUtils.java:70)
        at 
java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:760)
        at 
java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(CompletableFuture.java:736)
        at 
java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:474)
        at 
java.util.concurrent.CompletableFuture.complete(CompletableFuture.java:1962)
        at 
org.apache.hadoop.hbase.zookeeper.ReadOnlyZKClient$ZKTask$1.exec(ReadOnlyZKClient.java:174)
        at 
org.apache.hadoop.hbase.zookeeper.ReadOnlyZKClient.run(ReadOnlyZKClient.java:342)
        ... 1 more
{noformat}

I think the logic is introduced at the time that we do not change the state of 
meta region on zk. But now, we will change the state of meta region, so maybe 
we should remove the logic.



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