Hey Da, You may have observed https://issues.apache.org/jira/browse/HDFS-1601.
Regards, Jeff On Fri, Jan 28, 2011 at 7:08 PM, Da Zheng <[email protected]> wrote: > Hello, > > I monitored system calls of HDFS with systemtap and found HDFS actually > sends > many 1-byte data to the network. I could also see many 8-byte and 64-byte > data > written to the OS though I don't know whether they are written to the disk > or > sent to the network. I did see many 8-byte data sent to the network. The > number > of these data is several times more than 64KB data packet sent by HDFS. > > Could anyone tell me why HDFS sends so many small packets? heartbeat > messages? > RPCs? It doesn't seem to me these messages can be just 1 byte. > > Thanks, > Da >
