StefanRRichter 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_r210660176
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File path: docs/ops/state/large_state_tuning.md
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@@ -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:
They are the names of some enum constants, but we are case-insensitive when
evaluating them.
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