[jira] [Created] (CASSANDRA-6654) Droppable tombstones are not being removed from LCS table despite being above 20%

["Keith Wright (JIRA)" <ji...@apache.org>]

Keith Wright created CASSANDRA-6654:
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             Summary: Droppable tombstones are not being removed from LCS table despite being above 20%
                 Key: CASSANDRA-6654
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6654
             Project: Cassandra
          Issue Type: Bug
          Components: Core
         Environment: 1.2.13 VNodes with murmur3
            Reporter: Keith Wright


JMX is showing that one of our CQL3 LCS tables has a droppable tombstone ratio above 20% and increasing (currently at 28%).  Compactions are not falling behind and we are using the OOTB setting for this feature so I would expect not to go above 20% (will attach screen shot from JMX).   Table description:

CREATE TABLE global_user (
  user_id timeuuid,
  app_id int,
  type text,
  name text,
  extra_param map<text, text>,
  last timestamp,
  paid boolean,
  sku_time map<text, timestamp>,
  values map<timestamp, float>,
  PRIMARY KEY (user_id, app_id, type, name)
) WITH
  bloom_filter_fp_chance=0.100000 AND
  caching='KEYS_ONLY' AND
  comment='' AND
  dclocal_read_repair_chance=0.000000 AND
  gc_grace_seconds=86400 AND
  read_repair_chance=0.100000 AND
  replicate_on_write='true' AND
  populate_io_cache_on_flush='false' AND
  compaction={'sstable_size_in_mb': '160', 'class': 'LeveledCompactionStrategy'} AND
  compression={'chunk_length_kb': '8', 'crc_check_chance': '0.1', 'sstable_compression': 'LZ4Compressor'}; 



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