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From Robert Coli <rc...@eventbrite.com>
Subject Re: Flush writer all time blocked
Date Thu, 29 Aug 2013 17:57:30 GMT
On Thu, Aug 29, 2013 at 10:49 AM, S C <asf11@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.

=Rob

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