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From Demai Ni <nid...@gmail.com>
Subject Re: hbase regionserver fail over -- how long it will take?
Date Sat, 21 Sep 2013 04:02:07 GMT
Ted, 

Thanks a lot. I will look into it

Demai on the run

On Sep 20, 2013, at 8:44 PM, Ted Yu <yuzhihong@gmail.com> wrote:

> bq. another regionserver, which contain another copy of the data,  will
> pick up.
> 
> Replica of data (HFile and WAL) is stored on data nodes.
> 
> In http://hbase.apache.org/book.html, take a look at 9.7.2.2. Failover
> and 9.7.3. Region-RegionServer Locality
> 
> Cheers
> 
> 
> On Fri, Sep 20, 2013 at 4:14 PM, Demai Ni <nidmgg@gmail.com> wrote:
> 
>> hi, folks,
>> 
>> My understanding of hbase within cluster highavailability is to keep 3 copy
>> of data(dfs.replication, default is 3). Whenever a region server
>> fails(offlline), another regionserver, which contain another copy of the
>> data,  will pick up.
>> 
>> Is my understanding correct? In that case, usually how long will take the
>> failover to complete, so that the data will be available?
>> 
>> Can I get a couple pointers? or on-line doc? many thanks
>> 
>> Demai
>> 

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