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:
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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:[EMAIL PROTECTED]]
> Sent: Tuesday, June 12, 2012 3:18 PM
> To: [EMAIL PROTECTED]
> 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.

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.
Are these three slaves called RegionServer? And if yes How many data nodes
are there now with me..I guess its 3.plz correct me if I am wrong. thx..
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:[EMAIL PROTECTED]]
>> Sent: Tuesday, June 12, 2012 3:18 PM
>> To: [EMAIL PROTECTED]
>> 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.

See response inline.

> -----Original Message-----
> From: AnExplorer [mailto:[EMAIL PROTECTED]]
> Sent: Tuesday, June 12, 2012 5:05 PM
> To: [EMAIL PROTECTED]
> 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:[EMAIL PROTECTED]]
> >> Sent: Tuesday, June 12, 2012 3:18 PM
> >> To: [EMAIL PROTECTED]
> >> 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.

Hi there-

You probably should at least read this part of the RefGuide for an introŠ

http://hbase.apache.org/book.html#architecture

Š welcome to HBase!
On 6/12/12 5:48 AM, "AnExplorer" <[EMAIL PROTECTED]> wrote:

>
>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--tp33998720p339
>98720.html
>Sent from the HBase User mailing list archive at Nabble.com.

As one picture could give more than thousand words...check out the first figure on 
http://www.larsgeorge.com/search?q=HBase+Architecture

It's the best figure I know to understand how Hadoop(here HDFS) and HBase are related to each other.

________________________________
Von: AnExplorer <[EMAIL PROTECTED]>
An: [EMAIL PROTECTED]
Gesendet: 13:34 Dienstag, 12.Juni 2012
Betreff: 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.
Are these three slaves called RegionServer? And if yes How many data nodes
are there now with me..I guess its 3.plz correct me if I am wrong. thx..
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:[EMAIL PROTECTED]]
>> Sent: Tuesday, June 12, 2012 3:18 PM
>> To: [EMAIL PROTECTED]
>> 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. 

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:[EMAIL PROTECTED]]
>> Sent: Tuesday, June 12, 2012 5:05 PM
>> To: [EMAIL PROTECTED]
>> 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:[EMAIL PROTECTED]]
>> >> Sent: Tuesday, June 12, 2012 3:18 PM
>> >> To: [EMAIL PROTECTED]
>> >> 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.

Thanks Doug. I have gone through this and theoretically kind of understood
it. But after setting up the cluster, I was not able to make out that where
is RegionServer and where I can find that.
Would really seek help in future from you guys.Thanks a lot!!

Doug Meil-2 wrote:
>
>
> Hi there-
>
> You probably should at least read this part of the RefGuide for an introŠ
>
> http://hbase.apache.org/book.html#architecture
>
> Š welcome to HBase!
>
>
>
>
> On 6/12/12 5:48 AM, "AnExplorer" <[EMAIL PROTECTED]> wrote:
>
>>
>>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--tp33998720p339
>>98720.html
>>Sent from the HBase User mailing list archive at Nabble.com.
>
>
>
>

--
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Sent from the HBase User mailing list archive at Nabble.com.