JeongDaeKim commented on issue #749: HBASE-23205 Correctly update the position 
of WALs currently being replicated
URL: https://github.com/apache/hbase/pull/749#issuecomment-554897893
 
 
   Failed tests are unrelated to this PR, and not reproduced in my local env.
   
   
![image](https://user-images.githubusercontent.com/15886396/69034324-4d49bd00-0a24-11ea-8ab5-380d82f72c81.png)
   
   ```
   Cannot delete /user/jenkins/test-data/72b993b9-2876-4d2d-be72-f1fcc47a2371. 
Name node is in safe mode.
   Resources are low on NN. Please add or free up more resources then turn off 
safe mode manually. NOTE:  If you turn off safe mode before adding resources, 
the NN will immediately return to safe mode. Use "hdfs dfsadmin -safemode 
leave" to turn safe mode off. NamenodeHostName:localhost
    at 
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.newSafemodeException(FSNamesystem.java:1407)
    at 
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkNameNodeSafeMode(FSNamesystem.java:1395)
    at 
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.delete(FSNamesystem.java:2853)
    at 
org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.delete(NameNodeRpcServer.java:1048)
    at 
org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.delete(ClientNamenodeProtocolServerSideTranslatorPB.java:641)
    at 
org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
    at 
org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:447)
    at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:989)
    at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:850)
    at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:793)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.security.auth.Subject.doAs(Subject.java:421)
    at 
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1844)
    at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2489)
   ```

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