Hi, Does anyone have any tips to share regarding optimization for random read performance? For writes I've found that setting a large write buffer and setting auto-flush to false on the client side significantly improved put performance. Are there any similar easy tweaks to improve random read performance?
I'm using HBase 0.20.3 in a very read-heavy real-time system with 1 master and 3 region servers. It was working ok for a while, but today there was a severe degradation in read performance. Restarting Hadoop and HBase didn't help, are there are no errors in the logs. Read performance starts off around 1,000-2,000 gets/second but quickly (within minutes) drops to around 100 gets/second. I've already looked at the performance tuning wiki page. On the server side I've increased hbase.regionserver.handler.count from 10 to 100, but it didn't help. Maybe this is expected because I'm only using a single client to do reads. I'm working on implementing a client pool now, but I'm wondering if there are any other settings on the server or client side that might improve things. Thanks, James
