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Subject [GitHub] twalthr commented on a change in pull request #6504: [FLINK-10068][docs] Add documentation for RocksDB-based timers and st…
Date Thu, 09 Aug 2018 14:38:28 GMT
twalthr commented on a change in pull request #6504: [FLINK-10068][docs] Add documentation
for RocksDB-based timers and st…
URL: https://github.com/apache/flink/pull/6504#discussion_r208952984
 
 

 ##########
 File path: docs/ops/state/large_state_tuning.md
 ##########
 @@ -142,6 +142,17 @@ by default. To enable this feature, users can instantiate a `RocksDBStateBackend
         new RocksDBStateBackend(filebackend, true);
 {% endhighlight %}
 
+**RocksDB Timers**
+
+For RocksDB, user can chose whether timers are stored on the heap (default) or inside RocksDB.
Heap-based timers can have a better performance for smaller amounts of
+timers, while storing timers inside RocksDB offers higher scalability as the amount of timers
in RocksDB can exceed the available main memory (spilling to disk).
+
+When using RockDB as state backend, the type of timer storage can be selected through Flink's
configuration via option key `RocksDBOptions.TIMER_SERVICE_FACTORY`.
+Possible choices are `HEAP` (to store timers on the heap, default) and `ROCKSDB` (to store
timers in RocksDB).
 
 Review comment:
   Usually all YAML values are lower case. These are upper case?

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