Async HBase Client ○ Implementation ○ Performance ● How do we tuning G1GC for HBase ○ CMS vs G1 ○ Tuning G1GC ○ G1GC in XiaoMi HBase Cluster Part-1 Async HBase Client Why Async HBase Client Proof that latency of async client is at least the same as blocking hbase client. Part-2 HBase + G1GC Tuning CMS VS G1 OldGen GC (Before) OldGen GC (After) CMS Old Gen GC CMS VS G1 Mixed GC (Before) A new table with 400 regions ○ 100 millions rows whose value is 1000 bytes ● Pressure test for G1GC tuning ○ 40 write clients + 20 read clients ○ 1 hour for each JVM option changed ● HBase configuration

latencies in 100% Get Case (5 Nodes) Picture.2 G1GC related metrics in 100% Get Case In above pictures, the p999 latency is almost the same as G1GC STW cost (~100ms). After HBASE-11425​ , almost