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From Henry Junyoung Kim <henry.jy...@gmail.com>
Subject Re: are we able to decommission multi nodes at one time?
Date Tue, 02 Apr 2013 08:16:58 GMT
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 <harsh@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 <yanbohappy@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.jykim@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 <azuryyyu@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 <yanbohappy@gmail.com> wrote:
>>>> 
>>>> You want to decommission how many nodes?
>>>> 
>>>> 
>>>> 2013/4/2 Henry JunYoung KIM <henry.jykim@gmail.com>
>>>>> 
>>>>> 15 for datanodes and 3 for replication factor.
>>>>> 
>>>>> 2013. 4. 1., 오후 3:23, varun kumar <varun.uid@gmail.com> 작성:
>>>>> 
>>>>>> How many nodes do you have and replication factor for it.
>>>>> 
>>>> 
>>> 
>>> 
>> 
> 
> 
> 
> -- 
> Harsh J


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