KevinWikant commented on PR #4568:
URL: https://github.com/apache/hadoop/pull/4568#issuecomment-1186492545

   ```
   [ERROR] Tests run: 6803, Failures: 0, Errors: 2, Skipped: 24, Flakes: 8
   [INFO] 
   [ERROR] There are test failures
   ```
   
   ```
   [ERROR] Errors: 
   [ERROR] 
org.apache.hadoop.hdfs.server.namenode.TestFsck.testFsckCorruptWhenOneReplicaIsCorrupt(org.apache.hadoop.hdfs.server.namenode.TestFsck)
   [ERROR]   Run 1: TestFsck.testFsckCorruptWhenOneReplicaIsCorrupt » Remote 
java.lang.NullPointer...
   [ERROR]   Run 2: TestFsck.testFsckCorruptWhenOneReplicaIsCorrupt » Remote 
java.lang.NullPointer...
   [ERROR]   Run 3: TestFsck.testFsckCorruptWhenOneReplicaIsCorrupt » Remote 
java.lang.NullPointer...
   [INFO] 
   [ERROR] 
org.apache.hadoop.hdfs.server.namenode.ha.TestObserverNode.testMkdirsRaceWithObserverRead(org.apache.hadoop.hdfs.server.namenode.ha.TestObserverNode)
   [ERROR]   Run 1: TestObserverNode.testMkdirsRaceWithObserverRead:557 Client 
#3 lastSeenStateId=-9223372036854775808 activStateId=37
   null
   [ERROR]   Run 2: TestObserverNode.testMkdirsRaceWithObserverRead:511 » 
Connect Call From 653bab...
   [ERROR]   Run 3: TestObserverNode.cleanUp:111 » Connect Call From 
653bab42d979/172.17.0.2 to lo...
   [ERROR]   Run 4: TestObserverNode.testMkdirsRaceWithObserverRead:511 » 
Connect Call From 653bab...
   [ERROR]   Run 5: TestObserverNode.cleanUp:111 » Connect Call From 
653bab42d979/172.17.0.2 to lo...
   ```
   
   - TestObserverNode#testMkdirsRaceWithObserverRead is a flaky test: 
https://issues.apache.org/jira/browse/HDFS-15646
   
   The other test failure is relevant 
TestFsck#testFsckCorruptWhenOneReplicaIsCorrupt:
   
   ```
   [ERROR] Tests run: 35, Failures: 0, Errors: 3, Skipped: 0, Time elapsed: 
281.876 s <<< FAILURE! - in org.apache.hadoop.hdfs.server.namenode.TestFsck
   [ERROR] 
testFsckCorruptWhenOneReplicaIsCorrupt(org.apache.hadoop.hdfs.server.namenode.TestFsck)
  Time elapsed: 7.446 s  <<< ERROR!
   org.apache.hadoop.ipc.RemoteException(java.lang.NullPointerException): 
java.lang.NullPointerException
        at 
org.apache.hadoop.hdfs.server.blockmanagement.CorruptReplicasMap.removeFromCorruptReplicasMap(CorruptReplicasMap.java:145)
        at 
org.apache.hadoop.hdfs.server.blockmanagement.CorruptReplicasMap.removeFromCorruptReplicasMap(CorruptReplicasMap.java:134)
        at 
org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.removeStoredBlock(BlockManager.java:4255)
        at 
org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.removeStaleReplicas(BlockManager.java:4262)
        at 
org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.updateLastBlock(BlockManager.java:4772)
        at 
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.updatePipelineInternal(FSNamesystem.java:6004)
        at 
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.updatePipeline(FSNamesystem.java:5966)
        at 
org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.updatePipeline(NameNodeRpcServer.java:1009)
        at 
org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.updatePipeline(ClientNamenodeProtocolServerSideTranslatorPB.java:1195)
        at 
org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
        at 
org.apache.hadoop.ipc.ProtobufRpcEngine2$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine2.java:620)
        at 
org.apache.hadoop.ipc.ProtobufRpcEngine2$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine2.java:588)
        at 
org.apache.hadoop.ipc.ProtobufRpcEngine2$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine2.java:572)
        at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1192)
        at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:1193)
        at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:1116)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:422)
        at 
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1919)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:3131)
   
   ```
   


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