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The "StorageConfiguration" page has been changed by JonHermes. http://wiki.apache.org/cassandra/StorageConfiguration?action=diff&rev1=38&rev2=39 -------------------------------------------------- Default is: '864000' seconds, or 10 days. * '''keys_cached''' and '''rows_cached''' - Determines how many keys and rows to cache. The values can either be an absolute ('200000') or a double 0 <= d <= 1 ('0.52' for 52% cached). + Determines how many keys and rows to cache. The values can either be an absolute value or a double between 0 and 1 (inclusive on both ends). Each key cache hit saves 1 seek and each row cache hit saves 2 seeks at the minimum, sometimes more. The key cache is fairly tiny for the amount of time it saves, so it's worthwhile to use it at large numbers all the way up to 1.0 (all keys cached). The row cache saves even more time, but must store the whole values of its rows, so it is extremely space-intensive. It's best to only use the row cache if you have hot rows or static rows. @@ -172, +172 @@ Default is: 'false'. * '''read_repair_chance''' - Before 0.7, read_repair was either invoked on every read request or on none of them. This is now tunable as a double 0 <= d <= 1 for the chance of invoking the repair. + Before 0.7, read_repair was either invoked on every read request or on none of them. This is now tunable as a double between 0 and 1 (inclusive on both ends) for the chance of invoking the repair. Default is: '1.0', read repair on every read request. @@ -185, +185 @@ == per-Column Settings == * '''index_name''' and '''index_type''' + These settings control the secondary (automatic) indexes. See [[SecondaryIndexes]]. + + Default is: '', no secondary index support. + * '''validation_class''' + Used with the default_validation_class property in the per-columnfamily settings. Whenever the column with this name is populated, the value is validated with the validation classes' validate() method. + + Default is: 'BytesType', a no-op. +
