Thread dump result of region server

"IPC Server handler 26 on 60020" tid=72 daemon=true priority=5 state=BLOCKED at org.apache.hadoop.hbase.regionserver.HLog.append at org.apache.hadoop.hbase.regionserver.HRegion.put at org.apache.hadoop.hbase.regionserver.HRegion.put at org.apache.hadoop.hbase.regionserver.HRegion.put at org.apache.hadoop.hbase.regionserver.HRegionServer.put at sun.reflect.GeneratedMethodAccessor3.invoke at sun.reflect.DelegatingMethodAccessorImpl.invoke at java.lang.reflect.Method.invoke at org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call at org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run "IPC Server handler 64 on 60020" tid=110 daemon=true priority=5 state=BLOCKED at org.apache.hadoop.hbase.regionserver.HRegion.obtainRowLock at org.apache.hadoop.hbase.regionserver.HRegion.getLock at org.apache.hadoop.hbase.regionserver.HRegion.put at org.apache.hadoop.hbase.regionserver.HRegion.put at org.apache.hadoop.hbase.regionserver.HRegionServer.put at sun.reflect.GeneratedMethodAccessor3.invoke at sun.reflect.DelegatingMethodAccessorImpl.invoke at java.lang.reflect.Method.invoke at org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call at org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run "IPC Server handler 33 on 60020" tid=79 daemon=true priority=5 state=BLOCKED at org.apache.hadoop.hbase.regionserver.HRegion.releaseRowLock at org.apache.hadoop.hbase.regionserver.HRegion.put at org.apache.hadoop.hbase.regionserver.HRegion.put at org.apache.hadoop.hbase.regionserver.HRegionServer.put at sun.reflect.GeneratedMethodAccessor3.invoke at sun.reflect.DelegatingMethodAccessorImpl.invoke at java.lang.reflect.Method.invoke at org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call at org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run 这是HBase的client在做大量插入record的时候的log，可以发现很多时候线程阻塞在行锁上以及HLog获得写锁上。因为一个regionserver上面的所有region拥有同一个HLog，所以不可避免会有竞争。