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Posted to user@hbase.apache.org by Jens Hartung <hb...@jens-hartung.de> on 2011/09/07 13:46:34 UTC

Question about HBase Cluster Replication

Hello everyone,

I have to evaluate HBase for a university project. Therefore I read the 
cluster replication document on HBase main site ( 
http://hbase.apache.org/replication.html ).

According to the missing feature, there can be only one slave cluster 
currently. Can the slave cluster be used for read only-access (eg. for 
load-balancing cases)? When yes, how I have to configure the clusters?

Greetings, Jens

Re: Question about HBase Cluster Replication

Posted by lars hofhansl <lh...@yahoo.com>.
Kein Problem :)


Actually you could even use the slave cluster for writes (those changes would not get replicated back, though).
The timestamping of HBase makes that all possible and easy.


I am working on Master-Master replication (see HBASE-2195).


-- Lars



________________________________
From: Jens Hartung <ca...@jens-hartung.de>
To: user@hbase.apache.org
Sent: Wednesday, September 7, 2011 1:01 PM
Subject: Re: Question about HBase Cluster Replication

Hallo Lars,

thanks for your response. I had a discussion with my tutor about the 
cluster-replication feature. He thought, this is only for backup 
purposes. And I didn't find the decisive hint, that the slave can be 
used for read-only queries.

Jens

Am 07.09.2011 18:51, schrieb lars hofhansl:
> Hallo Jens,
>
> yes, you can use the slave cluster for read-only queries (but be aware that the replication is asynchronous, which means the slave can be behind).
> Beyond setting up replication there is no other setup needed for this.
>
> We (Salesforce.com) might be adding code to supporting multiple slaves, but it is not clear when we'll get to that, yet.
>
>
> -- Lars
>
>
>
> ________________________________
> From: Jens Hartung<hb...@jens-hartung.de>
> To: HBase Mailinglist<us...@hbase.apache.org>
> Sent: Wednesday, September 7, 2011 4:46 AM
> Subject: Question about HBase Cluster Replication
>
> Hello everyone,
>
> I have to evaluate HBase for a university project. Therefore I read the cluster replication document on HBase main site ( http://hbase.apache.org/replication.html ).
>
> According to the missing feature, there can be only one slave cluster currently. Can the slave cluster be used for read only-access (eg. for load-balancing cases)? When yes, how I have to configure the clusters?
>
> Greetings, Jens

Re: Question about HBase Cluster Replication

Posted by Jens Hartung <ca...@jens-hartung.de>.
Hallo Lars,

thanks for your response. I had a discussion with my tutor about the 
cluster-replication feature. He thought, this is only for backup 
purposes. And I didn't find the decisive hint, that the slave can be 
used for read-only queries.

Jens

Am 07.09.2011 18:51, schrieb lars hofhansl:
> Hallo Jens,
>
> yes, you can use the slave cluster for read-only queries (but be aware that the replication is asynchronous, which means the slave can be behind).
> Beyond setting up replication there is no other setup needed for this.
>
> We (Salesforce.com) might be adding code to supporting multiple slaves, but it is not clear when we'll get to that, yet.
>
>
> -- Lars
>
>
>
> ________________________________
> From: Jens Hartung<hb...@jens-hartung.de>
> To: HBase Mailinglist<us...@hbase.apache.org>
> Sent: Wednesday, September 7, 2011 4:46 AM
> Subject: Question about HBase Cluster Replication
>
> Hello everyone,
>
> I have to evaluate HBase for a university project. Therefore I read the cluster replication document on HBase main site ( http://hbase.apache.org/replication.html ).
>
> According to the missing feature, there can be only one slave cluster currently. Can the slave cluster be used for read only-access (eg. for load-balancing cases)? When yes, how I have to configure the clusters?
>
> Greetings, Jens

Re: Question about HBase Cluster Replication

Posted by lars hofhansl <lh...@yahoo.com>.
Hallo Jens,

yes, you can use the slave cluster for read-only queries (but be aware that the replication is asynchronous, which means the slave can be behind).
Beyond setting up replication there is no other setup needed for this.

We (Salesforce.com) might be adding code to supporting multiple slaves, but it is not clear when we'll get to that, yet.


-- Lars



________________________________
From: Jens Hartung <hb...@jens-hartung.de>
To: HBase Mailinglist <us...@hbase.apache.org>
Sent: Wednesday, September 7, 2011 4:46 AM
Subject: Question about HBase Cluster Replication

Hello everyone,

I have to evaluate HBase for a university project. Therefore I read the cluster replication document on HBase main site ( http://hbase.apache.org/replication.html ).

According to the missing feature, there can be only one slave cluster currently. Can the slave cluster be used for read only-access (eg. for load-balancing cases)? When yes, how I have to configure the clusters?

Greetings, Jens