We are using leveled compaction running cassandra 1.0.6. I checked the data directory (/var/lib/cassandra/data) and i see these 0 bytes tmp files. What are these files?
thanks Ramesh -rw-r--r-- 1 root root 0 Dec 14 17:15 uid-tmp-hc-106-Data.db -rw-r--r-- 1 root root 0 Dec 14 17:15 uid-tmp-hc-106-Index.db -rw-r--r-- 1 root root 0 Dec 14 17:23 uid-tmp-hc-117-Data.db -rw-r--r-- 1 root root 0 Dec 14 17:23 uid-tmp-hc-117-Index.db -rw-r--r-- 1 root root 0 Dec 14 15:51 uid-tmp-hc-11-Data.db -rw-r--r-- 1 root root 0 Dec 14 15:51 uid-tmp-hc-11-Index.db -rw-r--r-- 1 root root 0 Dec 14 17:31 uid-tmp-hc-129-Data.db -rw-r--r-- 1 root root 0 Dec 14 17:31 uid-tmp-hc-129-Index.db -rw-r--r-- 1 root root 0 Dec 14 17:40 uid-tmp-hc-142-Data.db -rw-r--r-- 1 root root 0 Dec 14 17:40 uid-tmp-hc-142-Index.db -rw-r--r-- 1 root root 0 Dec 14 17:40 uid-tmp-hc-145-Data.db -rw-r--r-- 1 root root 0 Dec 14 17:40 uid-tmp-hc-145-Index.db -rw-r--r-- 1 root root 0 Dec 14 17:47 uid-tmp-hc-158-Data.db -rw-r--r-- 1 root root 0 Dec 14 17:47 uid-tmp-hc-158-Index.db -rw-r--r-- 1 root root 0 Dec 14 17:47 uid-tmp-hc-162-Data.db -rw-r--r-- 1 root root 0 Dec 14 17:47 uid-tmp-hc-162-Index.db -rw-r--r-- 1 root root 0 Dec 14 17:55 uid-tmp-hc-175-Data.db -rw-r--r-- 1 root root 0 Dec 14 17:55 uid-tmp-hc-175-Index.db -rw-r--r-- 1 root root 0 Dec 14 17:55 uid-tmp-hc-179-Data.db -rw-r--r-- 1 root root 0 Dec 14 17:55 uid-tmp-hc-179-Index.db -rw-r--r-- 1 root root 0 Dec 14 18:03 uid-tmp-hc-193-Data.db -rw-r--r-- 1 root root 0 Dec 14 18:03 uid-tmp-hc-193-Index.db -rw-r--r-- 1 root root 0 Dec 14 18:03 uid-tmp-hc-197-Data.db -rw-r--r-- 1 root root 0 Dec 14 18:03 uid-tmp-hc-197-Index.db -rw-r--r-- 1 root root 0 Dec 14 16:02 uid-tmp-hc-19-Data.db -rw-r--r-- 1 root root 0 Dec 14 16:02 uid-tmp-hc-19-Index.db -rw-r--r-- 1 root root 0 Dec 14 18:03 uid-tmp-hc-200-Data.db -rw-r--r-- 1 root root 0 Dec 14 18:03 uid-tmp-hc-200-Index.db -rw-r--r-- 1 root root 0 Dec 14 18:11 uid-tmp-hc-213-Data.db -rw-r--r-- 1 root root 0 Dec 14 18:11 uid-tmp-hc-213-Index.db -rw-r--r-- 1 root root 0 Dec 14 18:11 uid-tmp-hc-217-Data.db -rw-r--r-- 1 root root 0 Dec 14 18:11 uid-tmp-hc-217-Index.db -rw-r--r-- 1 root root 0 Dec 14 18:19 uid-tmp-hc-230-Data.db -rw-r--r-- 1 root root 0 Dec 14 18:19 uid-tmp-hc-230-Index.db -rw-r--r-- 1 root root 0 Dec 14 18:19 uid-tmp-hc-235-Data.db -rw-r--r-- 1 root root 0 Dec 14 18:19 uid-tmp-hc-235-Index.db -rw-r--r-- 1 root root 0 Dec 14 18:27 uid-tmp-hc-249-Data.db -rw-r--r-- 1 root root 0 Dec 14 18:27 uid-tmp-hc-249-Index.db -rw-r--r-- 1 root root 0 Dec 14 18:27 uid-tmp-hc-253-Data.db -rw-r--r-- 1 root root 0 Dec 14 18:27 uid-tmp-hc-253-Index.db -rw-r--r-- 1 root root 0 Dec 14 18:28 uid-tmp-hc-257-Data.db -rw-r--r-- 1 root root 0 Dec 14 18:28 uid-tmp-hc-257-Index.db -rw-r--r-- 1 root root 0 Dec 14 18:35 uid-tmp-hc-270-Data.db -rw-r--r-- 1 root root 0 Dec 14 18:35 uid-tmp-hc-270-Index.db -rw-r--r-- 1 root root 0 Dec 14 18:36 uid-tmp-hc-275-Data.db -rw-r--r-- 1 root root 0 Dec 14 18:36 uid-tmp-hc-275-Index.db -rw-r--r-- 1 root root 0 Dec 14 18:44 uid-tmp-hc-288-Data.db -rw-r--r-- 1 root root 0 Dec 14 18:44 uid-tmp-hc-288-Index.db -rw-r--r-- 1 root root 0 Dec 14 16:10 uid-tmp-hc-28-Data.db -rw-r--r-- 1 root root 0 Dec 14 16:10 uid-tmp-hc-28-Index.db -rw-r--r-- 1 root root 0 Dec 14 18:44 uid-tmp-hc-293-Data.db -rw-r--r-- 1 root root 0 Dec 14 18:44 uid-tmp-hc-293-Index.db -rw-r--r-- 1 root root 0 Dec 14 18:52 uid-tmp-hc-307-Data.db -rw-r--r-- 1 root root 0 Dec 14 18:52 uid-tmp-hc-307-Index.db -rw-r--r-- 1 root root 0 Dec 14 18:52 uid-tmp-hc-310-Data.db -rw-r--r-- 1 root root 0 Dec 14 18:52 uid-tmp-hc-310-Index.db -rw-r--r-- 1 root root 0 Dec 14 18:52 uid-tmp-hc-315-Data.db -rw-r--r-- 1 root root 0 Dec 14 18:52 uid-tmp-hc-315-Index.db -rw-r--r-- 1 root root 0 Dec 14 19:00 uid-tmp-hc-328-Data.db -rw-r--r-- 1 root root 0 Dec 14 19:00 uid-tmp-hc-328-Index.db -rw-r--r-- 1 root root 0 Dec 14 19:00 uid-tmp-hc-333-Data.db -rw-r--r-- 1 root root 0 Dec 14 19:00 uid-tmp-hc-333-Index.db -rw-r--r-- 1 root root 0 Dec 14 19:08 uid-tmp-hc-347-Data.db -rw-r--r-- 1 root root 0 Dec 14 19:08 uid-tmp-hc-347-Index.db -rw-r--r-- 1 root root 0 Dec 14 19:08 uid-tmp-hc-353-Data.db -rw-r--r-- 1 root root 0 Dec 14 19:08 uid-tmp-hc-353-Index.db -rw-r--r-- 1 root root 0 Dec 14 19:09 uid-tmp-hc-357-Data.db -rw-r--r-- 1 root root 0 Dec 14 19:09 uid-tmp-hc-357-Index.db -rw-r--r-- 1 root root 0 Dec 14 19:17 uid-tmp-hc-370-Data.db -rw-r--r-- 1 root root 0 Dec 14 19:17 uid-tmp-hc-370-Index.db -rw-r--r-- 1 root root 0 Dec 14 19:17 uid-tmp-hc-375-Data.db -rw-r--r-- 1 root root 0 Dec 14 19:17 uid-tmp-hc-375-Index.db -rw-r--r-- 1 root root 0 Dec 14 19:25 uid-tmp-hc-389-Data.db -rw-r--r-- 1 root root 0 Dec 14 19:25 uid-tmp-hc-389-Index.db -rw-r--r-- 1 root root 0 Dec 14 16:18 uid-tmp-hc-38-Data.db -rw-r--r-- 1 root root 0 Dec 14 16:18 uid-tmp-hc-38-Index.db -rw-r--r-- 1 root root 0 Dec 14 19:25 uid-tmp-hc-393-Data.db -rw-r--r-- 1 root root 0 Dec 14 19:25 uid-tmp-hc-393-Index.db -rw-r--r-- 1 root root 0 Dec 14 19:25 uid-tmp-hc-399-Data.db -rw-r--r-- 1 root root 0 Dec 14 19:25 uid-tmp-hc-399-Index.db -rw-r--r-- 1 root root 0 Dec 14 19:33 uid-tmp-hc-412-Data.db -rw-r--r-- 1 root root 0 Dec 14 19:33 uid-tmp-hc-412-Index.db -rw-r--r-- 1 root root 0 Dec 14 19:34 uid-tmp-hc-418-Data.db -rw-r--r-- 1 root root 0 Dec 14 19:34 uid-tmp-hc-418-Index.db -rw-r--r-- 1 root root 0 Dec 14 19:42 uid-tmp-hc-432-Data.db -rw-r--r-- 1 root root 0 Dec 14 19:42 uid-tmp-hc-432-Index.db -rw-r--r-- 1 root root 0 Dec 14 19:42 uid-tmp-hc-438-Data.db -rw-r--r-- 1 root root 0 Dec 14 19:42 uid-tmp-hc-438-Index.db -rw-r--r-- 1 root root 0 Dec 14 19:42 uid-tmp-hc-442-Data.db -rw-r--r-- 1 root root 0 Dec 14 19:42 uid-tmp-hc-442-Index.db -rw-r--r-- 1 root root 0 Dec 14 19:50 uid-tmp-hc-455-Data.db -rw-r--r-- 1 root root 0 Dec 14 19:50 uid-tmp-hc-455-Index.db -rw-r--r-- 1 root root 0 Dec 14 19:50 uid-tmp-hc-460-Data.db -rw-r--r-- 1 root root 0 Dec 14 19:50 uid-tmp-hc-460-Index.db -rw-r--r-- 1 root root 10486534 Dec 14 19:58 uid-tmp-hc-470-Data.db -rw-r--r-- 1 root root 35176 Dec 14 19:58 uid-tmp-hc-470-Filter.db -rw-r--r-- 1 root root 255860 Dec 14 19:58 uid-tmp-hc-470-Index.db -rw-r--r-- 1 root root 0 Dec 14 16:26 uid-tmp-hc-49-Data.db -rw-r--r-- 1 root root 0 Dec 14 16:26 uid-tmp-hc-49-Index.db -rw-r--r-- 1 root root 0 Dec 14 15:38 uid-tmp-hc-5-Data.db -rw-r--r-- 1 root root 0 Dec 14 15:38 uid-tmp-hc-5-Index.db -rw-r--r-- 1 root root 0 Dec 14 16:35 uid-tmp-hc-61-Data.db -rw-r--r-- 1 root root 0 Dec 14 16:35 uid-tmp-hc-61-Index.db -rw-r--r-- 1 root root 0 Dec 14 16:43 uid-tmp-hc-74-Data.db -rw-r--r-- 1 root root 0 Dec 14 16:43 uid-tmp-hc-74-Index.db -rw-r--r-- 1 root root 0 Dec 14 16:50 uid-tmp-hc-80-Data.db -rw-r--r-- 1 root root 0 Dec 14 16:50 uid-tmp-hc-80-Index.db -rw-r--r-- 1 root root 0 Dec 14 16:59 uid-tmp-hc-87-Data.db -rw-r--r-- 1 root root 0 Dec 14 16:59 uid-tmp-hc-87-Index.db -rw-r--r-- 1 root root 0 Dec 14 17:07 uid-tmp-hc-96-Data.db -rw-r--r-- 1 root root 0 Dec 14 17:07 uid-tmp-hc-96-Index.db
