Parth Setya created CASSANDRA-9776:
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Summary: Tombstone Compaction Not Getting Triggered on a single
SSTable even when the % of Droppable > 85%
Key: CASSANDRA-9776
URL: https://issues.apache.org/jira/browse/CASSANDRA-9776
Project: Cassandra
Issue Type: New Feature
Environment: RHEL
Apache Cassandra v 2.0.14
Reporter: Parth Setya
Fix For: 2.0.14
The following steps can be used to Replicate the Issue:
1. Reduce gc_grace_seconds to 18000
2. Set tombstone_compaction_interval to 1 day
3. Insert 9 Million Rows
4. Delete 9 Million Rows
5. Insert 1 Million Rows
6. Run Major Compaction so that the Tombstones for 9 million rows and expiring
columns for 1 million rows are in the same SStable.(In may case the size of the
resultant sstable was 963M)
Note: I also ran "nodetool cfstats" command and the found that the number of
keys in the CF to be 10000000(as expected)
Tombstone Compaction on the resultant SSTable should have been triggered after
1 day after the creation of that Table but nothing happened for > 2 days.
After 3 days I ran major compaction the size of the table was reduced to 213M.
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