Note though that its only possible to decommission 7 nodes at the same time and expect it to finish iff the remaining 8 nodes have adequate free space for the excess replicas.
If you're just going to take them down for a short while (few mins each), its easier to do so in a rolling manner without need of a decommission. You can take upto two down at a time on a replication average of 3 or 3+, and put it back in later without too much data movement impact. On Tue, Apr 2, 2013 at 1:06 PM, Yanbo Liang <[email protected]> wrote: > It's reasonable to decommission 7 nodes at the same time. > But may be it also takes long time to finish it. > Because all the replicas in these 7 nodes need to be copied to remaining 8 > nodes. > The size of transfer from these nodes to the remaining nodes is equal. > > > 2013/4/2 Henry Junyoung Kim <[email protected]> >> >> :) >> >> currently, I have 15 data nodes. >> for some tests, I am trying to decommission until 8 nodes. >> >> Now, the total dfs used size is 52 TB which is including all replicated >> blocks. >> from 15 to 8, total spent time is almost 4 days long. ;( >> >> someone mentioned that I don't need to decommission node by node. >> for this case, is there no problems if I decommissioned 7 nodes at the >> same time? >> >> >> 2013. 4. 2., 오후 12:14, Azuryy Yu <[email protected]> 작성: >> >> I can translate it to native English: how many nodes you want to >> decommission? >> >> >> On Tue, Apr 2, 2013 at 11:01 AM, Yanbo Liang <[email protected]> wrote: >>> >>> You want to decommission how many nodes? >>> >>> >>> 2013/4/2 Henry JunYoung KIM <[email protected]> >>>> >>>> 15 for datanodes and 3 for replication factor. >>>> >>>> 2013. 4. 1., 오후 3:23, varun kumar <[email protected]> 작성: >>>> >>>> > How many nodes do you have and replication factor for it. >>>> >>> >> >> > -- Harsh J
