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https://issues.apache.org/jira/browse/CASSANDRA-3511?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13156469#comment-13156469
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Joaquin Casares commented on CASSANDRA-3511:
--------------------------------------------
I ran these scripts on 1.0.2 and 1.0.3.
On 1.0.2
========
I didn't spot the error on either case.
On 1.0.3
========
First Case
----------
I spotted it on the SuperColumns of the first case.
Second Case
------------
When I created Standard1 _after_ Standard2, Standard1 would have a 'Key cache
size' of 0, otherwise it rose normally.
After further testing doing the case above no longer causes a 'Key cache size'
of 0. What happened between both tests was me changing key_cache_save_period to
60, which stopped 'Key cache size' staying at 0. Note: Each time I ran the
test, I dropped the keyspace.
First Case
http://aep.appspot.com/display/rg4UvMF2vIjo6JfDMmWz9UVNmP0/
Second Case
http://aep.appspot.com/display/-dkHdKy45e1sdRsjjEQBrZFpEyI/
> Supercolumn key caches are not saved
> ------------------------------------
>
> Key: CASSANDRA-3511
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3511
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Affects Versions: 1.0.2, 1.0.3
> Reporter: Radim Kolar
> Priority: Minor
> Labels: supercolumns
>
> 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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