Hello Users, I have a question.
My client complains to me, HBase scan spent too much time. So I started to debug. I profiled the HBase Client Application using hprof. The App spent the most time in below stack trace. ---- java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:Unknown line) java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:Unknown line) java.util.concurrent.LinkedBlockingQueue.poll(LinkedBlockingQueue.java:Unknown line) java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:Unknown line) java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:Unknown line) java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:Unknown line) java.lang.Thread.run(Thread.java:Unknown line) --- --- org.apache.hadoop.hbase.ipc.RpcClientImpl$Connection.waitForWork(RpcClientImpl.java:Unknown line) org.apache.hadoop.hbase.ipc.RpcClientImpl$Connection.run(RpcClientImpl.java:Unknown line) --- they spent 92% of total time. I don't understand why they spent a lot of time. Do you have any idea? Best regards, Minwoo Kang
