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 >
