Ken,
What queue size are you referring to?
Thanks,SC
> From: ken.hanc...@schange.com
> Date: Thu, 29 Aug 2013 14:21:04 -0400
> Subject: Re: Flush writer all time blocked
> To: user@cassandra.apache.org
>
> On Thu, Aug 29, 2013 at 1:57 PM, Robert Coli <rc...@eventbrite.com> wrote:
> > On Thu, Aug 29, 2013 at 10:49 AM, S C <as...@outlook.com> wrote:
> >> I see a high count "All time blocked" for Flush Writer on nodetool tpstats.
> >>
> >> Is it how many blocked ever since the server was online? Can somebody
> >> explain me what it is? I really appreciate it.
> >
> >
> > Yes.
> >
> > Flush Writer thread pool is the thread pool responsible for the part of
> > memtable flush that actually writes to disk.
> > If you see it with a non-zero blocked number, you have at some time written
> > to memory significantly faster than you
> > could flush to disk.
>
> I don't think this is strictly true? There's also the periodic flush
> that can cause a storm of flushes if you have multiple column
> families. I sent out a query to the list last week on this topic but
> didn't get any responses -- I'm very interested in this topic as I've
> had to set my queue size fairly large to avoid this issue.
>
> Ken
