one more question, currently, our cluster is under decommissioning.
Without any safe stop steps, could I do downtime work forcibly? 2013. 4. 2., 오후 5:37, Harsh J <[email protected]> 작성: > 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 > <[email protected]> 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 <[email protected]> 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 <[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 >> > > > > -- > Harsh J
