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Nikolai Grigoriev updated CASSANDRA-6496: ----------------------------------------- Attachment: system.log.gz system.log.1.gz Attaching the logs. I have enabled the compaction logging this morning to get a slight idea of what was going on. > Endless L0 LCS compactions > -------------------------- > > Key: CASSANDRA-6496 > URL: https://issues.apache.org/jira/browse/CASSANDRA-6496 > Project: Cassandra > Issue Type: Bug > Components: Core > Environment: Cassandra 2.0.3, Linux, 6 nodes, 5 disks per node > Reporter: Nikolai Grigoriev > Attachments: system.log.1.gz, system.log.gz > > > I have first described the problem here: > http://stackoverflow.com/questions/20589324/cassandra-2-0-3-endless-compactions-with-no-traffic > I think I have really abused my system with the traffic (mix of reads, heavy > updates and some deletes). Now after stopping the traffic I see the > compactions that are going on endlessly for over 4 days. > For a specific CF I have about 4700 sstable data files right now. The > compaction estimates are logged as "[3312, 4, 0, 0, 0, 0, 0, 0, 0]". > sstable_size_in_mb=256. 3214 files are about 256Mb (+/1 few megs), other > files are smaller or much smaller than that. No sstables are larger than > 256Mb. What I observe is that LCS picks 32 sstables from L0 and compacts them > into 32 sstables of approximately the same size. So, what my system is doing > for last 4 days (no traffic at all) is compacting groups of 32 sstables into > groups of 32 sstables without any changes. Seems like a bug to me regardless > of what did I do to get the system into this state... -- This message was sent by Atlassian JIRA (v6.1.4#6159)