Hello, I'm using cdh3u2, if it matters. I'm using the dfs.exclude.hosts to decommission a good percentage of my cluster as I scale it down for a period of time. I'm just trying to understand how hdfs goes about this, because I haven't found anything more than a "how to use" documentation for the feature.
When I look at the name node UI, I see under replicated blocks count go up when I decommission. Also, when I look at the dfsnodelist with whatNodes=decommissioning, there are stats there like Blocks with no live replicas, etc. When I decommission a node does it immediately make that node unavailable, thus these stats? Or does it move them off safely and these counts are just to say what would happen if the node was shut down without decommission? Something else? Thanks for any insight.
