Hexiaoqiao commented on PR #4661:
URL: https://github.com/apache/hadoop/pull/4661#issuecomment-1203949940

   @ZanderXu Thanks for your contribution. IIRC, there is also some other 
precondition checks before initialized, Would you mind to give another check? 
such as `org.apache.hadoop.hdfs.server.datanode.DataNode#initReplicaRecovery` 
or  `replicaHandler = datanode.data.createRbw(storageType, storageId, block, 
allowLazyPersist);` (which datanode.data is null before DataNode initialized) 
at 
[here](https://github.com/apache/hadoop/blob/b7edc6c60ca9e17c4f6a7d07aad5efbd7c2e3b40/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockReceiver.java#L219).
 


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