Yes, it could definitely be related to KAFKA-615. The default in 0.8.1 is to let the OS handle disk writes. This is much more efficient as it will schedule them in an order friendly to the layout on disk and do a good job of merging adjacent writes. However if you are explicitly configuring an fsync policy (either by time or number of messages) then this is likely not the cause.
-Jay On Tue, Jul 22, 2014 at 9:37 PM, Jason Rosenberg <j...@squareup.com> wrote: > I recently upgraded some of our kafka clusters to use 0.8.1.1 (from 0.8.0). > It's all looking good so far. One thing I notice though (seems like a > good thing) is that the iostat utilization has gone way down after the > upgrade. > > I'm not sure if I know exactly what could could be responsible for this, is > this an expected result. > > Is it possibly related to: https://issues.apache.org/jira/browse/KAFKA-615 > > Thanks, > > Jason
