On 7/7/10 10:10 AM, Julie wrote:
This doesn't explain why 30 GB of data is taking up 106 GB of disk 24 hours after all writes have completed. Compactions should be complete, no?
Is your workload straight INSERT or does it contain UPDATE and/or DELETE? If your workload contains UPDATE/DELETE and GCGraceSeconds (10 days by default) hasn't passed, you might have a non-trivial number of tombstone rows. Only major compactions clean up tombstones in the current implementation and even given improvements [1] they will always be necessary in some cases.
=Rob [1] https://issues.apache.org/jira/browse/CASSANDRA-1074
