These 0 byte files with "-Compacted" suffix indicate that the associated sstables can be removed. In current version, Cassandra delete compacted sstables at Full GC and on startup.
maki 2011/7/14 Sameer Farooqui <cassandral...@gmail.com>: > Running Cassandra 0.8.1. Ran major compaction via: > > sudo /home/ubuntu/brisk/resources/cassandra/bin/nodetool -h localhost > compact & > > From what I'd read about Cassandra, I thought that after compaction all of > the different SSTables on disk for a Column Family would be merged into one > new file. > > However, there are now a bunch of 0-sized Compacted files and a bunch of > Data files. Any ideas about why there are still so many files left? > > Also, is a minor compaction the same thing as a read-only compaction in 0.7? > > > ubuntu@domU-12-31-39-0E-x-x:/raiddrive/data/DemoKS$ ls -l > total 270527136 > -rw-r--r-- 1 root root 0 2011-07-13 03:07 DemoCF-g-5670-Compacted > -rw-r--r-- 1 root root 89457447799 2011-07-10 00:26 DemoCF-g-5670-Data.db > -rw-r--r-- 1 root root 193456 2011-07-10 00:26 DemoCF-g-5670-Filter.db > -rw-r--r-- 1 root root 2081159 2011-07-10 00:26 DemoCF-g-5670-Index.db > -rw-r--r-- 1 root root 4276 2011-07-10 00:26 > DemoCF-g-5670-Statistics.db > -rw-r--r-- 1 root root 0 2011-07-13 03:07 DemoCF-g-5686-Compacted > -rw-r--r-- 1 root root 920521489 2011-07-09 22:03 DemoCF-g-5686-Data.db > -rw-r--r-- 1 root root 11776 2011-07-09 22:03 DemoCF-g-5686-Filter.db > -rw-r--r-- 1 root root 126725 2011-07-09 22:03 DemoCF-g-5686-Index.db > -rw-r--r-- 1 root root 4276 2011-07-09 22:03 > DemoCF-g-5686-Statistics.db > -rw-r--r-- 1 root root 0 2011-07-13 03:07 DemoCF-g-5781-Compacted > -rw-r--r-- 1 root root 223970446 2011-07-09 22:38 DemoCF-g-5781-Data.db > -rw-r--r-- 1 root root 7216 2011-07-09 22:38 DemoCF-g-5781-Filter.db > -rw-r--r-- 1 root root 32750 2011-07-09 22:38 DemoCF-g-5781-Index.db > -rw-r--r-- 1 root root 4276 2011-07-09 22:38 > DemoCF-g-5781-Statistics.db > -rw-r--r-- 1 root root 0 2011-07-13 03:07 DemoCF-g-5874-Compacted > -rw-r--r-- 1 root root 156284248 2011-07-09 23:20 DemoCF-g-5874-Data.db > -rw-r--r-- 1 root root 5056 2011-07-09 23:20 DemoCF-g-5874-Filter.db > -rw-r--r-- 1 root root 10400 2011-07-09 23:20 DemoCF-g-5874-Index.db > -rw-r--r-- 1 root root 4276 2011-07-09 23:20 > DemoCF-g-5874-Statistics.db > -rw-r--r-- 1 root root 0 2011-07-13 03:07 DemoCF-g-6938-Compacted > -rw-r--r-- 1 root root 22947541446 2011-07-10 11:43 DemoCF-g-6938-Data.db > -rw-r--r-- 1 root root 49936 2011-07-10 11:43 DemoCF-g-6938-Filter.db > -rw-r--r-- 1 root root 563550 2011-07-10 11:43 DemoCF-g-6938-Index.db > -rw-r--r-- 1 root root 4276 2011-07-10 11:43 > DemoCF-g-6938-Statistics.db > -rw-r--r-- 1 root root 0 2011-07-13 03:07 DemoCF-g-6996-Compacted > -rw-r--r-- 1 root root 224253930 2011-07-10 11:28 DemoCF-g-6996-Data.db > -rw-r--r-- 1 root root 7216 2011-07-10 11:27 DemoCF-g-6996-Filter.db > -rw-r--r-- 1 root root 26250 2011-07-10 11:28 DemoCF-g-6996-Index.db > -rw-r--r-- 1 root root 4276 2011-07-10 11:28 > DemoCF-g-6996-Statistics.db > -rw-r--r-- 1 root root 0 2011-07-13 03:07 DemoCF-g-8324-Compacted > > -- w3m
