azagrebin commented on a change in pull request #8459: [FLINK-12476] [State
TTL] Consider setting a default background cleanup strategy in StateTtlConfig
URL: https://github.com/apache/flink/pull/8459#discussion_r290168733
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File path: docs/dev/stream/state/state.md
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@@ -400,6 +400,35 @@ This option is not applicable for the incremental
checkpointing in the RocksDB s
- For existing jobs, this cleanup strategy can be activated or deactivated
anytime in `StateTtlConfig`,
e.g. after restart from savepoint.
+#### Cleanup in background
+
+Besides cleanup in full snapshot, you can also activate the cleanup in
background. The following option
+will activate a default background cleanup in StateTtlConfig if it is
supported for the used backend:
+
+<div class="codetabs" markdown="1">
+<div data-lang="java" markdown="1">
+{% highlight java %}
+import org.apache.flink.api.common.state.StateTtlConfig;
+StateTtlConfig ttlConfig = StateTtlConfig
+ .newBuilder(Time.seconds(1))
+ .cleanupInBackground()
+ .build();
+{% endhighlight %}
+</div>
+ <div data-lang="scala" markdown="1">
+{% highlight scala %}
+import org.apache.flink.api.common.state.StateTtlConfig
+val ttlConfig = StateTtlCon fig
Review comment:
remove space `StateTtlCon fig` -> `StateTtlConfig`
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