Datanode decommisioning vs Write

Question

What happens when we decommission a datanode while write is happening to HDFS on that node?

Will it stop writing the data to HDFS on that node and decommision that node or will it finish writing and then decommision it.

Answer 1

I found a solution for this in cloudera.

Decommissioning applies to only to HDFS DataNode, MapReduce TaskTracker, YARN NodeManager, and HBase RegionServer roles. If the host has other roles running on it, those roles are stopped/killed.

http://www.cloudera.com/content/cloudera/en/documentation/core/latest/topics/cm_mc_decomm_host.html