My SSTable size is 100Mb. Last time I removed leveled manifest compaction was running for 3 months
From: Robert Coli [mailto:rc...@eventbrite.com] Sent: 19 февраля 2014 г. 6:24 To: user@cassandra.apache.org Subject: Re: Turn off compression (1.2.11) On Mon, Feb 17, 2014 at 4:35 PM, Plotnik, Alexey <aplot...@rhonda.ru<mailto:aplot...@rhonda.ru>> wrote: After analyzing Heap I saw this buffer has a size about 70KB per SSTable. I have more than 30K SSTables per node. I'm thinking your problem is not compression, it's using the old 5mb default for Level Compaction and having 30,000 SSTables as a result. Before turning off compression, I suggest : 1) change level SSTable size to the new default, 160mb 2) force all SSTables to L0 (in 1.2, this means removing their .json files with the node down, IIRC) 3) watch level compaction run for a long time, reducing the number of SSTables you have As an aside, 1.2.0 beta moved a bunch of data related to compression off the heap. If you were to try to run the same cluster under 1.1, you'd probably OOM your heap immediately. https://issues.apache.org/jira/browse/CASSANDRA-4941 =Rob
