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Posted to user@hbase.apache.org by seven garfee <ga...@gmail.com> on 2011/07/26 11:59:53 UTC

RPC-level log

I'm testing Hbase read performance recently.
the Random-Read-Latency in my cluster  is  beyond 200 ms.So Slowly.

I dumped 100G data(about 1G keys with 100byte value each) in the cluster,and
set java head size to 10G,tuning the block.cache.size to 0.35
but it does not work.

How could I decrease Random Read Latency？

I wonder what takes so much time，so I turn on RPC-level logging.

The log outputs:
2011-07-26 15:35:20,354 DEBUG org.apache.hadoop.ipc.HBaseServer:  got #64449
2011-07-26 15:35:20,354 DEBUG org.apache.hadoop.ipc.HBaseServer: IPC Server
handler 83 on 50061: has #64449 from 192.168.1.108:59377
2011-07-26 15:35:20,354 DEBUG org.apache.hadoop.ipc.HBaseServer: Served: get
queueTime= 0 procesingTime= 0
2011-07-26 15:35:20,354 DEBUG org.apache.hadoop.ipc.HBaseServer: IPC Server
Responder: responding to #64449 from 192.168.1.108:59377
2011-07-26 15:35:20,354 DEBUG org.apache.hadoop.ipc.HBaseServer: IPC Server
Responder: responding to #64449 from 192.168.1.108:59377 Wrote 11 bytes.

what's the log's meaning?
did it say the Region Server take 0 ms to process Get Op?