If increasing hbase.client.scanner.caching makes no difference you have another issue. How many rows do you expect your to return?
On contemporary hardware I manage to scan a few million KeyValues (i.e. columns) per second and per CPU core. Note that for scan performance you want to increase the BLOCKSIZE. -- Lars ________________________________ From: LEI Xiaofeng <[email protected]> To: [email protected] Sent: Monday, January 6, 2014 11:06 PM Subject: hbase read performance tuning failed Hi, I am running hbase-0.94.6-cdh4.5.0 and set up a cluster of 5 nodes. The random read performance is ok, but the scan performance is poor. I tried to increase "hbase.client.scanner.caching" to 100 to promote the scan performance but it made no difference. And when I tried to make smaller blocks by setting "BLOCKSIZE" when created tables to get better random read performance it made no difference too. So, I am wondering if anyone could give some advice to solve this problem. Thanks
