> > It's another reason to avoid major / manual compactions which create a > single big SSTable. Minor compactions keep things in buckets which means > newer SSTable can be compacted needing to read the bigger older tables. > I've never run a major/manual compaction on this ring. In my case running repair on a "big" keyspace results in SSTables piling up. My problematic node just filled up 483GB (yes, GB) of SSTTables. Here are the biggest ls -laSrh (...)
-rw-r--r-- 1 cassandra cassandra 2.7G 2011-08-15 14:13 PUBLIC_MONTHLY_20-g-4581-Data.db -rw-r--r-- 1 cassandra cassandra 2.7G 2011-08-15 14:52 PUBLIC_MONTHLY_20-g-4641-Data.db -rw-r--r-- 1 cassandra cassandra 2.8G 2011-08-15 14:39 PUBLIC_MONTHLY_20-tmp-g-4878-Data.db -rw-r--r-- 1 cassandra cassandra 2.9G 2011-08-15 15:00 PUBLIC_MONTHLY_20-g-4656-Data.db -rw-r--r-- 1 cassandra cassandra 3.0G 2011-08-15 14:17 PUBLIC_MONTHLY_20-g-4599-Data.db -rw-r--r-- 1 cassandra cassandra 3.0G 2011-08-15 15:11 PUBLIC_MONTHLY_20-g-4675-Data.db -rw-r--r-- 3 cassandra cassandra 3.1G 2011-08-13 10:34 PUBLIC_MONTHLY_18-g-3861-Data.db -rw-r--r-- 1 cassandra cassandra 3.2G 2011-08-15 14:41 PUBLIC_MONTHLY_20-tmp-g-4884-Data.db -rw-r--r-- 1 cassandra cassandra 3.6G 2011-08-15 14:44 PUBLIC_MONTHLY_20-tmp-g-4894-Data.db -rw-r--r-- 1 cassandra cassandra 3.8G 2011-08-15 14:56 PUBLIC_MONTHLY_20-tmp-g-4934-Data.db -rw-r--r-- 1 cassandra cassandra 3.8G 2011-08-15 14:46 PUBLIC_MONTHLY_20-tmp-g-4905-Data.db -rw-r--r-- 1 cassandra cassandra 4.0G 2011-08-15 14:57 PUBLIC_MONTHLY_20-tmp-g-4935-Data.db -rw-r--r-- 3 cassandra cassandra 5.9G 2011-08-13 12:53 PUBLIC_MONTHLY_19-g-4219-Data.db -rw-r--r-- 3 cassandra cassandra 6.0G 2011-08-13 13:57 PUBLIC_MONTHLY_20-g-4538-Data.db -rw-r--r-- 3 cassandra cassandra 12G 2011-08-13 09:27 PUBLIC_MONTHLY_20-g-4501-Data.db On the other nodes the same directory is around 69GB. Why are there so fewer large files there and so many big ones on the repairing node ? -rw-r--r-- 1 cassandra cassandra 434M 2011-08-15 16:02 PUBLIC_MONTHLY_17-g-3525-Data.db -rw-r--r-- 1 cassandra cassandra 456M 2011-08-15 15:50 PUBLIC_MONTHLY_19-g-4253-Data.db -rw-r--r-- 1 cassandra cassandra 485M 2011-08-15 14:30 PUBLIC_MONTHLY_20-g-5280-Data.db -rw-r--r-- 1 cassandra cassandra 572M 2011-08-15 15:15 PUBLIC_MONTHLY_18-g-3774-Data.db -rw-r--r-- 2 cassandra cassandra 664M 2011-08-09 15:39 PUBLIC_MONTHLY_20-g-4893-Index.db -rw-r--r-- 2 cassandra cassandra 811M 2011-08-11 21:27 PUBLIC_MONTHLY_16-g-2597-Data.db -rw-r--r-- 2 cassandra cassandra 915M 2011-08-13 04:00 PUBLIC_MONTHLY_18-g-3695-Data.db -rw-r--r-- 1 cassandra cassandra 925M 2011-08-15 03:39 PUBLIC_MONTHLY_17-g-3454-Data.db -rw-r--r-- 1 cassandra cassandra 1.3G 2011-08-15 13:46 PUBLIC_MONTHLY_19-g-4199-Data.db -rw-r--r-- 2 cassandra cassandra 1.5G 2011-08-10 15:37 PUBLIC_MONTHLY_17-g-3218-Data.db -rw-r--r-- 1 cassandra cassandra 1.9G 2011-08-15 14:35 PUBLIC_MONTHLY_20-g-5281-Data.db -rw-r--r-- 2 cassandra cassandra 2.1G 2011-08-10 16:33 PUBLIC_MONTHLY_19-g-3946-Data.db -rw-r--r-- 2 cassandra cassandra 3.1G 2011-08-10 22:23 PUBLIC_MONTHLY_18-g-3509-Data.db -rw-r--r-- 2 cassandra cassandra 4.0G 2011-08-10 18:18 PUBLIC_MONTHLY_20-g-5024-Data.db -rw------- 2 cassandra cassandra 5.1G 2011-08-09 15:23 PUBLIC_MONTHLY_19-g-3847-Data.db -rw-r--r-- 2 cassandra cassandra 9.6G 2011-08-09 15:39 PUBLIC_MONTHLY_20-g-4893-Data.db This whole compaction thing is getting me worried : how are sites in production dealing with SSTables becoming larger and larger and thus taking longer and longer to compact ? Adding nodes every couple of weeks ? Philippe
