On Thu, Apr 21, 2011 at 5:13 AM, Eran Kutner <[email protected]> wrote: > I tested again on a clean table using 100 insert threads each, using a > separate keyspace within the test table. Every row had just one column > with 128 bytes of data. > > With one server and one region I got about 2300 inserts per second. > After manually splitting the region I got about 3600 inserts per > second (still on one machine). After a while the regions were balanced > and one was moved to another server, that got writes to around 4500 > writes per second. Additional splits and moves to more servers didn't > improve this number and the write performance stabilized at ~4000 > writes/sec per server. This seems pretty low, especially considering > other numbers I've seen around here. >
If you run your insert process on more than one box, do the numbers change? Nothing in http://hbase.apache.org/book.html#performance helps? What size your keys? > Read performance is at around 1500 rows per second per server, which > seems extremely low to me, especially considering that all the working > set I was querying could fit in the servers memory. To make the test > interesting I limited my client to fetch only 1 row (always the same > one) from each keyspace, that yielded 10K reads per sec per server, so > I tried increasing the range again a read the same 10 rows, now the > performance dropped to 8500 reads/sec per server. Increasing the range > to 100 rows and the performance drops to around 3500 reads per second > per server. This result is interesting. The cache logs hit rate in the regionserver logs. You seeing near 100% for 1 row, 10 row, and 100 rows? St.Ack
