On Fri, Jan 4, 2013 at 8:39 AM, Jun Rao <[EMAIL PROTECTED]> wrote:

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.

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