Hi, Sequential write is about 7000row/s sequential Read 20000 rows/s random write is about 8000 row/s random read 17000 rows/s So how about your numbers? 2010/6/24 Jean-Daniel Cryans <[email protected]>
> When I run PE, random/seqRead are always much slower than > random/seqWrite so it seems to be something about your env or you are > confused by the output of that test. > > What are the numbers you see? > > J-D > > On Wed, Jun 23, 2010 at 5:32 AM, 史英杰 <[email protected]> wrote: > > Hi, All > > Recently I did some tests on HBase, using the performance eveluation > > package in HBase 0.20.3. There are some situations I can't understand. I > > found that read perform better than write, no matter sequential read or > > random read during the test. But in BigTable's paper, writes perform > better > > than reads, because each tablet server appends all incoming writes to a > > single commit log and uses group commit to stream these writes > efficiently > > to GFS. In HBase, we set the autoFlush=false, and the flush size is 64M, > so > > writes should perform better than reads, but the result is just the > > opposite. Please help me to explain this phenomenon, thanks a lot! > > > > Yingjie > > >
