On Fri, Jan 4, 2013 at 8:39 AM, Jun Rao <jun...@gmail.com> wrote: > Do you know why some of the brokers are much slower than others?
We are currently running these in a shared environment, to make things worse these machines have single spindle. We have to put up with that until we move the brokers to dedicated hardware with multiple spindles. The problem is a bit exaggerated in current setup. Even with dedicated hardware, I am expecting some variation. One slightly degraded disk out of 12 could reduce effective b/w on all the spindles. Unfortunately there will be occasional rack level network slowdowns that take many hours to get fixed. In our case, we cannot let the back pressure from slow brokers propagate upstream. Producers receive messages from scribe aggregators and just have to drop the messages it they can't write fast enough.
