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Date: Tue, 19 Jul 2011 15:02:29 +0800
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Subject: Re: how to restart a hbase cluster
From: Weihua JIANG <weihua.jiang@gmail.com>
To: user@hbase.apache.org
Content-Type: text/plain; charset=UTF-8

It seems stop-hbase.sh only stops master/backup masters and zookeepers.

So, according to my understanding, region servers shall shutdown
itself since it can't find either master or zookeeper.

But, I made a recent experimentation on our hbase cluster. After 2
days of mater/zookeeper shutdown, the region servers are still alive.
I am not sure whether it is the problem in hbase release or our own
problem since our version is a heavy patched one.

Then, can I perform hbase cluster in following way?
1. stop master
2. stop master backups
3. stop zookeepers
4. stop region servers

The only difference is step #4. If I manually stop down RS, will it
affect data integrity? If not, then I can safely performed the steps
to shutdown the cluster.


Thanks
Weihua

2011/7/13 Ted Yu <yuzhihong@gmail.com>:
> For #2:
>
> bin/stop-hbase.sh
> check that master and region servers are down
> ...
> bin/start-hbase.sh
>
> On Tue, Jul 12, 2011 at 11:29 PM, Weihua JIANG <weihua.jiang@gmail.com>wrote:
>
>> Hi all,
>>
>> I am using HBase 0.90+HBASE-3789 and I want to know how to restart the
>> cluster safely.
>>
>> Basically, there are two kinds of restarts:
>> 1. Keep the HBase cluster working while restarting the whole cluster.
>> 2. Stop-the-world cluster restart which only ensure data safety.
>>
>> From my understanding, graceful_stop.sh and rolling restart is used
>> for kind #1. But, HBASE-3789 said it broke rolling restart. So, can
>> anyone tell me what it broke and how to fix it to make rolling restart
>> work?
>>
>> And, I can't find document about the kind #2 stop-the-world restart.
>> Can any one point me the how-to document about it?
>>
>> Thanks
>> Weihua
>>
>