Well I guess we will need some information to help you...

At least:

-Hardware ?
-Version of Cassandra ?
-Any specific action before restarting ?
-cassandra.yaml (options about compaction) ?
-...

Alain

2012/10/15 Manu Zhang <owenzhang1990@gmail.com>
My Cassandra is compacting like mad (look at the following messages) after I restart it after a timeout query. It won't stop until I kill the process. 


INFO 22:57:41,839 Compacting [SSTableReader(path='/home/manuzhang/cassandra/data/system/schema_columns/system-schema_columns-ia-1258-Data.db')]
 INFO 22:57:42,077 Compacted to [/home/manuzhang/cassandra/data/system/schema_columns/system-schema_columns-ia-1259-Data.db,].  4,377 to 4,377 (~100% of original) bytes for 3 keys at 0.017539MB/s.  Time: 238ms.
 INFO 22:57:42,079 Compacting [SSTableReader(path='/home/manuzhang/cassandra/data/system/schema_columns/system-schema_columns-ia-1259-Data.db')]
 INFO 22:57:42,309 Compacted to [/home/manuzhang/cassandra/data/system/schema_columns/system-schema_columns-ia-1260-Data.db,].  4,377 to 4,377 (~100% of original) bytes for 3 keys at 0.018149MB/s.  Time: 230ms.
 INFO 22:57:42,311 Compacting [SSTableReader(path='/home/manuzhang/cassandra/data/system/schema_columns/system-schema_columns-ia-1260-Data.db')]
 INFO 22:57:42,574 Compacted to [/home/manuzhang/cassandra/data/system/schema_columns/system-schema_columns-ia-1261-Data.db,].  4,377 to 4,377 (~100% of original) bytes for 3 keys at 0.015872MB/s.  Time: 263ms.
 INFO 22:57:42,576 Compacting [SSTableReader(path='/home/manuzhang/cassandra/data/system/schema_columns/system-schema_columns-ia-1261-Data.db')]
 INFO 22:57:42,814 Compacted to [/home/manuzhang/cassandra/data/system/schema_columns/system-schema_columns-ia-1262-Data.db,].  4,377 to 4,377 (~100% of original) bytes for 3 keys at 0.017539MB/s.  Time: 238ms.
 INFO 22:57:42,816 Compacting [SSTableReader(path='/home/manuzhang/cassandra/data/system/schema_columns/system-schema_columns-ia-1262-Data.db')]
 INFO 22:57:43,070 Compacted to [/home/manuzhang/cassandra/data/system/schema_columns/system-schema_columns-ia-1263-Data.db,].  4,377 to 4,377 (~100% of original) bytes for 3 keys at 0.016434MB/s.  Time: 254ms.