Hi,
we have a table which is being compacted all the time, with no change in size:
Compaction History:
compacted_at bytes_in bytes_out rows_merged
2018-07-25T05:26:48.101 57248063878 57248063878 {1:11655}
2018-07-25T01:09:47.346 57248063878 57248063878
{1:11655}
2018-07-24T20:52:48.652
57248063878 57248063878 {1:11655}
2018-07-24T16:36:01.828 57248063878 57248063878 {1:11655}
2018-07-24T12:11:00.026 57248063878 57248063878
{1:11655}
2018-07-24T07:28:04.686
57248063878 57248063878 {1:11655}
2018-07-24T02:47:15.290 57248063878 57248063878 {1:11655}
2018-07-23T22:06:17.410 57248137921 57248063878
{1:11655}
We tried setting unchecked_tombstone_compaction to false, had no effect.
The data is a time series, there will be only a handful of cell
tombstones present. The table has a TTL, but it'll be least a month
before it takes effect.
Table properties:
AND compaction = {'class':
'org.apache.cassandra.db.compaction.TimeWindowCompactionStrategy',
'compaction_window_size': '1', 'compaction_window_unit': 'DAYS',
'max_threshold': '32', 'min_threshold': '4',
'unchecked_tombstone_compaction': 'false'}
AND compression = {'chunk_length_in_kb': '64', 'class':
'org.apache.cassandra.io.compress.LZ4Compressor'}
AND crc_check_chance = 1.0
AND dclocal_read_repair_chance = 0.0
AND default_time_to_live = 63072000
AND gc_grace_seconds = 10800
AND max_index_interval = 2048
AND memtable_flush_period_in_ms = 0
AND min_index_interval = 128
AND read_repair_chance = 0.0
AND speculative_retry = 'NONE';
Thanks for any help
Martin
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