It sounds to me like you have a different bottleneck than the file system. 25K inserts x 1KB is only 25MB per second. Even HDFS can write that much with replication.
The issue is much more likely to do with the cost of sync'ing the logs. On Fri, May 6, 2011 at 12:56 PM, lohit <[email protected]> wrote: >> .. >> Whats really strange for me is that i run same test with same configuration >> once with RF=1, then RF=3 on HDFS. The results was kind of same. Why? >> Replication should add overhead..., so how it could be same? >> > > By default ycsb disables autoflush and increases write buffer size to large > amount. > My guess is this could be the reason you do not see much difference in when > changing replication. > Also, you might want to increase record size and then look at real > replication overhead. >
