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 <[email protected]> wrote: > On Fri, Aug 23, 2013 at 10:35 AM, Ken Hancock <[email protected]>wrote: > >> I appear to have a problem illustrated by >> https://issues.apache.org/jira/browse/CASSANDRA-1955. 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 > > -- *Ken Hancock *| System Architect, Advanced Advertising SeaChange International 50 Nagog Park Acton, Massachusetts 01720 [email protected] | www.schange.com | NASDAQ:SEAC<http://www.schange.com/en-US/Company/InvestorRelations.aspx> Office: +1 (978) 889-3329 | [image: Google Talk:] [email protected] | [image: Skype:]hancockks | [image: Yahoo IM:]hancockks [image: LinkedIn]<http://www.linkedin.com/in/kenhancock> [image: SeaChange International] <http://www.schange.com/>This e-mail and any attachments may contain information which is SeaChange International confidential. The information enclosed is intended only for the addressees herein and may not be copied or forwarded without permission from SeaChange International.
