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Posted to user@hbase.apache.org by Liu Xianglong <sa...@hotmail.com> on 2009/11/10 08:29:00 UTC

HBase application is slow in 3-node cluster

Hi, everyone. I am using HBase to store and retrieval data. Now there are three nodes. I found that when I run some applications using HBase, it is not as fast as I expect, sometime much slower than centralization locally in one node. I am not clear what the real reason: IO throughout or HBase responding? Could someone expert at HBase can tell me?

Best Wishes!
_____________________________________________________________
 
刘祥龙  Liu Xianglong

Re: HBase application is slow in 3-node cluster

Posted by stack <st...@duboce.net>.

2009/11/9 Liu Xianglong <sa...@hotmail.com>

> Hi, everyone. I am using HBase to store and retrieval data. Now there are
> three nodes. I found that when I run some applications using HBase, it is
> not as fast as I expect, sometime much slower than centralization locally in
> one node.



3-nodes slower than a single hbase instance?

Did you have hdfs when you were single-node hbase or were you using
filesystem?

Whats your client like?  Is it distributing the load nicely over the key
space?

Do you have enough data?   Are you filling more than a regions worth?

What in particular is slow?  Reads, writes or scans?

Thanks,
St.Ack