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From "Billy Pearson" <sa...@pearsonwholesale.com>
Subject Re: Decommission of nodes
Date Thu, 28 May 2009 16:11:55 GMT
The only reason I can thank of is the regionserver holding a open file on 
the datanodes like the log file for writing and the datanode is waiting for 
it close before moving it and exiting.

Billy


"Mat Hofschen" <hofschen@gmail.com> wrote in 
message news:d2b99530905280412s1c18e22dkc2f9b981a5889f5e@mail.gmail.com...
> Hi,
>
> how does hbase react to hadoop decommissioning nodes?
> Should I shutdown the regionservers first, before decommissioning or does 
> it
> matter at all? Is it possible that a running hbase prevents 
> decommissioning
> to finish?
>
> Matthias
>
>
>
> On Wed, May 27, 2009 at 7:44 PM, Billy Pearson
> <sales@pearsonwholesale.com>wrote:
>
>> the decommissioning process in hadoop takes a little while I thank there
>> the balancing bandwidth has a lot to do with it.
>> but to stop region server you should be able to run
>> bin/hbase-daemon.sh stop regionserver
>> on the server you want to stop the hbase as long as it not the master 
>> then
>> you can do this on a live cluster.
>> as each goes down they will tell the master by closing the regions and
>> releasing its leases and the master will start to redeploy the regions to
>> other servers.
>>
>> Billy
>>
>>
>> "Mat Hofschen" <hofschen@gmail.com> wrote 
>> in message
>> news:d2b99530905270754p566be51n8dc468f9d1d2384b@mail.gmail.com...
>>
>>  Hello,
>>> I just needed to remove 8 machines from our 33 node cluster.
>>> (hadoop-0.19.1,
>>> hbase-0.19.2)
>>> The first 4 nodes I decommissioned in hadoop with the exclude-file and
>>> hbase
>>> running. After 4 hours I gave up and stopped the machines by hand (they
>>> never finished the decommissioning in progress phase).
>>> For the next 4 nodes I stopped the hbase cluster then decommissioned the
>>> nodes in hadoop. After 10 minutes the decommissioning finished
>>> successfully.
>>>
>>>
>>> Is there a recommended way to remove nodes from hbase and how does that
>>> best
>>> work together with decommissioning in hadoop.
>>> How does hbase reconstruct the meta information during or after removal 
>>> of
>>> nodes?
>>>
>>> Thanks for your help,
>>> Matthias
>>>
>>>
>>
>>
> 



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