@allen_chu the possible reason could be the Datanode might be overwhelmed with multiple requests causing the network stall, if its specific this to this node then you may check the network level config  on this host, if not you may need to check at the overall cluster level load or any heavy write operations that is being pushed by the client to the HDFS. ... View more

@Shelton Please read my previous answer carefully. None of the properties provided by you are in hbase codebase ... View more

@Shelton  Thank you for your reply. This information is very helpful. ... View more