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From "Radim Kolar (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-3511) Key caches are not saved
Date Mon, 21 Nov 2011 07:22:51 GMT
Key caches are not saved
------------------------

                 Key: CASSANDRA-3511
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3511
             Project: Cassandra
          Issue Type: Bug
    Affects Versions: 1.0.2, 1.0.3
            Reporter: Radim Kolar
            Priority: Minor


cache saving seems to be broken in 1.0.2 and 1.0.3 i have 2 CF in keyspace with enabled cache
saving and only one gets its key cache saved. It worked perfectly in 0.8, both were saved.

This one works:
create column family query2
  with column_type = 'Standard'
  and comparator = 'AsciiType'
  and default_validation_class = 'BytesType'
  and key_validation_class = 'UTF8Type'
  and rows_cached = 500.0
  and row_cache_save_period = 0
  and row_cache_keys_to_save = 2147483647
  and keys_cached = 200000.0
  and key_cache_save_period = 14400
  and read_repair_chance = 1.0
  and gc_grace = 864000
  and min_compaction_threshold = 5
  and max_compaction_threshold = 10
  and replicate_on_write = false
  and row_cache_provider = 'ConcurrentLinkedHashCacheProvider'
  and compaction_strategy = 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy'

This does not
create column family dkb13
  with column_type = 'Super'
  and comparator = 'LongType'
  and subcomparator = 'AsciiType'
  and default_validation_class = 'BytesType'
  and key_validation_class = 'UTF8Type'
  and rows_cached = 600.0
  and row_cache_save_period = 0
  and row_cache_keys_to_save = 2147483647
  and keys_cached = 200000.0
  and key_cache_save_period = 14400
  and read_repair_chance = 1.0
  and gc_grace = 864000
  and min_compaction_threshold = 5
  and max_compaction_threshold = 10
  and replicate_on_write = false
  and row_cache_provider = 'ConcurrentLinkedHashCacheProvider'
  and compaction_strategy = 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy'

in second test system i created these 2 column families and none of them got single cache
key saved. Both have save period 30 seoonds - their cache should save often. Its not that
standard column family works while super does not.

create column family test1
  with column_type = 'Standard'
  and comparator = 'BytesType'
  and default_validation_class = 'BytesType'
  and key_validation_class = 'BytesType'
  and rows_cached = 0.0
  and row_cache_save_period = 0
  and row_cache_keys_to_save = 2147483647
  and keys_cached = 200000.0
  and key_cache_save_period = 30
  and read_repair_chance = 1.0
  and gc_grace = 864000
  and min_compaction_threshold = 4
  and max_compaction_threshold = 32
  and replicate_on_write = true
  and row_cache_provider = 'SerializingCacheProvider'
  and compaction_strategy = 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy';

create column family test2
  with column_type = 'Standard'
  and comparator = 'BytesType'
  and default_validation_class = 'BytesType'
  and key_validation_class = 'BytesType'
  and rows_cached = 0.0
  and row_cache_save_period = 0
  and row_cache_keys_to_save = 2147483647
  and keys_cached = 200000.0
  and key_cache_save_period = 30
  and read_repair_chance = 1.0
  and gc_grace = 864000
  and min_compaction_threshold = 4
  and max_compaction_threshold = 32
  and replicate_on_write = true
  and row_cache_provider = 'SerializingCacheProvider'
  and compaction_strategy = 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy';

If this is done on purpose for example cassandra 1.0 is doing some heuristic decision if cache
should be saved or not then it should be removed. Saving cache is fast.

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