What are you finding alarming w.r.t. your cluster? The metric is simple: When did the write start, and when did it finally end, for a single block? The difference is the writeBlockOp time. The average is over a varied collection, which is what you're looking at.
Are your jobs I/O bound? If so, I'd consider that low if the block sizes are small (64m/128m/256m say). If your jobs or services are CPU/Load bound, then such a metric makes lesser sense as a block completes only much later (for example, HBase WALs during no-write periods still keep block write connection open, bloating up these numbers). On Thu, May 2, 2013 at 3:52 PM, Jack <[email protected]> wrote: > Hi， > I check the datanode's write_block_op_avg_time on my cluster. It turns out > the value of write_block_op_avg_time is about 20000ms. Is that normal ? The > replication is 3. > > > > Regards, > Jack > -- Harsh J
