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From AnExplorer <satishtha...@gmail.com>
Subject RE: one HRegionServer means one DataNode?
Date Wed, 13 Jun 2012 05:10:53 GMT

Thanks Ram!!
So, there are 3 datanodes in the cluster. Is there any way to find out that
whether these datanodes are served by one RegionServer or more? where can we
see that?
Thanks again..


Ramkrishna.S.Vasudevan wrote:
> 
> See response inline.
> 
>> -----Original Message-----
>> From: AnExplorer [mailto:satishthakre@gmail.com]
>> Sent: Tuesday, June 12, 2012 5:05 PM
>> To: hbase-user@hadoop.apache.org
>> Subject: RE: one HRegionServer means one DataNode?
>> 
>> 
>> Thanks for the response Ram!! It is pretty much clear to me now that
>> RegionServers are part of HBase and Datanodes are part of HDFS.
>> Actually I
>> have a query - I had setup a hadoop cluster with one master and 3
>> slaves.
> [Ram] Hadoop Cluster -> What are the process that you are running as part
> of
> this? 
> [Ram] In HDFS you have Namenode and datanodes.  Here Namenode is like a
> master and Datanodes do the work of serving data.
> [Ram] In Hbase case, you have 2 things HMaster and HRegionServer.
> 
> [Ram] So if your hadoop cluster starts 3 datanodes then you have 3
> datanodes
> in your cluster. 
> [Ram] There can be even one RegionServer alone but the data from them can
> reside in all three Datanodes.
> Regards
> Ram
> 
>> 
>> 
>> 
>> Ramkrishna.S.Vasudevan wrote:
>> >
>> > Hi
>> >
>> > Region Server is not DataNode.
>> >
>> > DataNodes are part of HDFS.  RegionServers are part of HBase.  HBase
>> uses
>> > HDFS to store data and in the process of storing data DataNodes are
>> used
>> > by
>> > HDFS. DataNodes are the actual machines where the data resides.
>> >
>> > Regards
>> > Ram
>> >
>> >
>> >> -----Original Message-----
>> >> From: AnExplorer [mailto:satishthakre@gmail.com]
>> >> Sent: Tuesday, June 12, 2012 3:18 PM
>> >> To: hbase-user@hadoop.apache.org
>> >> Subject: one HRegionServer means one DataNode?
>> >>
>> >>
>> >> Hi..I am new to Hbase. Can anyone please suggest that one
>> HRegionServer
>> >> means
>> >> one DataNode? Can there be multiple data nodes in one
>> >> HRegionServer??:confused:
>> >> --
>> >> View this message in context: http://old.nabble.com/one-
>> HRegionServer-
>> >> means-one-DataNode--tp33998720p33998720.html
>> >> Sent from the HBase User mailing list archive at Nabble.com.
>> >
>> >
>> >
>> 
>> --
>> View this message in context: http://old.nabble.com/one-HRegionServer-
>> means-one-DataNode--tp33998720p33999181.html
>> Sent from the HBase User mailing list archive at Nabble.com.
> 
> 
> 

-- 
View this message in context: http://old.nabble.com/one-HRegionServer-means-one-DataNode--tp33998720p34003653.html
Sent from the HBase User mailing list archive at Nabble.com.


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