Yes, you can do the downtime work in steps of 2 DNs at a time, especially since you mentioned the total work would be only ~30mins at most.
On Tue, Apr 2, 2013 at 1:46 PM, Henry Junyoung Kim <henry.jy...@gmail.com> wrote: > the rest of nodes to be alive has enough size to store. > > for this one that you've mentioned. >> its easier to do so in a rolling manner without need of a >> decommission. > > to check my understanding, just shutting down 2 of them and then 2 more and > then 2 more without decommissions. > > is this correct? > > > 2013. 4. 2., 오후 4:54, Harsh J <ha...@cloudera.com> 작성: > >> 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 <yanboha...@gmail.com> 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 <henry.jy...@gmail.com> >>>> >>>> :) >>>> >>>> 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 <azury...@gmail.com> 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 <yanboha...@gmail.com> wrote: >>>>> >>>>> You want to decommission how many nodes? >>>>> >>>>> >>>>> 2013/4/2 Henry JunYoung KIM <henry.jy...@gmail.com> >>>>>> >>>>>> 15 for datanodes and 3 for replication factor. >>>>>> >>>>>> 2013. 4. 1., 오후 3:23, varun kumar <varun....@gmail.com> 작성: >>>>>> >>>>>>> How many nodes do you have and replication factor for it. >>>>>> >>>>> >>>> >>>> >>> >> >> >> >> -- >> Harsh J > -- Harsh J
