Cassandra 0.7.8 and 0.8.1 fail when major compaction on 37GB database

[lebron james]

  Hi, Please help me with my problem. For better performance i turn off
compaction and run massive inserts, after database reach 37GB i stop massive
inserts and start compaction with "NodeTool compaction Keyspace CFamily".
after half hour of work cassandra fall with error "Out of memory" i give
1500M to JVM, all parameters in yaml file are default. testing OS ubuntu
11.04 and windows server 2008 dc edition. Thanks!