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From Ken Hancock <>
Subject Re: Memtable flush blocking writes
Date Tue, 24 Sep 2013 15:55:54 GMT
This is on Cassandra 1.2.9 though packaged into DSE which I suspect may
come into play here.  I didn't really get to the bottom of it other than to
up the queue to 32 which is about the number of CFs I have.  After that,
mutation drops disappeared and the FlushWriter blocks went away.

On Mon, Sep 23, 2013 at 6:03 PM, Robert Coli <> wrote:

> On Fri, Aug 23, 2013 at 10:35 AM, Ken Hancock <>wrote:
>> I appear to have a problem illustrated by
>> At low data
>> rates, I'm seeing mutation messages dropped because writers are
>> blocked as I get a storm of memtables being flushed. OpsCenter
>> memtables seem to also contribute to this:
> ...
>> Now I can increase memtable_flush_queue_size, but it seems based on
>> the above that in order to solve the problem, I need to set this to
>> count(CF). What's the downside of this approach? It seems a backwards
>> solution to the real problem...
> What version of Cassandra? Did you ever get to the bottom of this?
> =Rob

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