Hi all, Could be related with a low hit ratio? -aah 2010/10/21, Tao Xie <[email protected]>: > BTW, Ryan, can you share some configurations tips of running YCSB to get > better random read performance? > Or can you provide some YCSB test results? In my experiments, I get 40~50k/s > insert throughput but only ~2k/s read throughput. > I wonder if there is something wrong with my configuration. > > Thanks in advance. > > 2010/10/21 Ryan Rawson <[email protected]> > >> Our own systems show much better performance with more cache, not sure >> why your test is weird. Maybe you could try to reproduce your results >> under YCSB, then we might have a chance of running your benchmark. >> >> >> On Wed, Oct 20, 2010 at 8:19 PM, ChingShen <[email protected]> >> wrote: >> > Hi all, >> > >> > I run my performance testing in random read, but I got the >> > hfile.block.cache.size = 0 performance is better than default, Is it >> > possible? >> > >> > My cluster (4 nodes): >> > Hadoop 0.20.2, HBase 0.20.6 >> > 1 * namenode & hmaster & zookeeper >> > 3 * datanode & regionserver >> > >> > P.S. Replication factor = 3, HBase heap size is 3500mb >> > >> > There are 10 millions records in my testing table, and per record >> > approximately 1kb. >> > >> > * The hfile.block.cache.size = 0*: >> > ============================================== >> > java benchmark.HReadR *10000* 1 >> > initial cost: 297 ms. >> > read: 198358 ms >> > read per: 19.8358 ms >> > *read thput: 50.4139 ops/sec* >> > ============================================== >> > java benchmark.HReadR *100000* 1 >> > initial cost: 285 ms. >> > read: 772474 ms >> > read per: 7.72474 ms >> > *read thput: 129.4542 ops/sec* >> > ============================================== >> > java benchmark.HReadR *10000* 1 >> > initial cost: 291 ms. >> > read: 43939 ms >> > read per: 4.3939 ms >> > *read thput: 227.58826 ops/sec* >> > ============================================== >> > java benchmark.HReadR *100000* 1 >> > initial cost: 292 ms. >> > read: 296763 ms >> > read per: 2.96763 ms >> > *read thput: 336.96924 ops/sec* >> > ============================================== >> > >> > >> > * The hfile.block.cache.size = 0.2 (default)*: >> > ============================================== >> > java benchmark.HReadR *10000* 1 >> > initial cost: 282 ms. >> > read: 157538 ms >> > read per: 15.7538 ms >> > read thput: *63.47675* ops/sec >> > ============================================== >> > java benchmark.HReadR *100000* 1 >> > initial cost: 292 ms. >> > read: 983083 ms >> > read per: 9.83083 ms >> > read thput: *101.72081* ops/sec >> > ============================================== >> > java benchmark.HReadR *10000* 1 >> > initial cost: 286 ms. >> > read: 83260 ms >> > read per: 8.326 ms >> > read thput: *120.10569* ops/sec >> > ============================================== >> > java benchmark.HReadR *100000* 1 >> > initial cost: 288 ms. >> > read: 839874 ms >> > read per: 8.39874 ms >> > read thput: *119.065475* ops/sec >> > ============================================== >> > >> > >> > Shen >> > >> >
-- Enviado desde mi dispositivo móvil
