Dear all, We have backported read path offheap (HBASE-11425) to our customized hbase-1.1.2 (thanks @Anoop for the help/support) and run it online for more than a month, and would like to share our experience, for what it's worth (smile).
Generally speaking, we gained a better and more stable throughput/performance with offheap, and below are some details: 1. QPS become more stable with offheap Performance w/o offheap: Performance w/ offheap: These data come from our online A/B test cluster (with 450 physical machines, and each with 256G memory + 64 core) with real world workloads, it shows using offheap we could gain a more stable throughput as well as better performance Not showing fully online data here because for online we published the version with both offheap and NettyRpcServer together, so no standalone comparison data for offheap 2. Full GC frequency and cost Average Full GC STW time reduce from 11s to 7s with offheap. 3. Young GC frequency and cost No performance degradation observed with offheap. 4. Peak throughput of one single RS On Singles Day (11/11), peak throughput of one single RS reached 100K, among which 90K from Get. Plus internet in/out data we could know the average result size of get request is ~1KB Offheap are used on all online machines (more than 1600 nodes) instead of LruCache, so the above QPS is gained from offheap bucketcache, along with NettyRpcServer(HBASE-15756). Just let us know if any comments. Thanks. Best Regards, Yu
