Github user aljoscha commented on a diff in the pull request:
https://github.com/apache/flink/pull/2174#discussion_r68744213
--- Diff:
flink-streaming-java/src/main/java/org/apache/flink/streaming/api/functions/source/ContinuousFileReaderOperator.java
---
@@ -405,6 +414,9 @@ public void restoreState(StreamTaskState state, long
recoveryTimestamp) throws E
S formatState = (S) ois.readObject();
// set the whole reader state for the open() to find.
+ Preconditions.checkArgument(this.readerState == null,
--- End diff --
This should also be `Preconditions.checkState`
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