Github user StephanEwen commented on a diff in the pull request:

    https://github.com/apache/flink/pull/674#discussion_r30787324
  
    --- Diff: 
flink-staging/flink-streaming/flink-streaming-connectors/src/main/java/org/apache/flink/streaming/connectors/kafka/api/persistent/PersistentKafkaSource.java
 ---
    @@ -225,7 +226,16 @@ public void close() {
     
        @Override
        public void restoreState(long[] state) {
    -           // we maintain the offsets in Kafka, so nothing to do.
    +           if(lastOffsets == null) {
    +                   LOG.warn("Restore state called before open() has been 
called");
    +                   return;
    +           }
    +           LOG.info("Restoring state to {}", Arrays.toString(state));
    +           if(lastOffsets.length != state.length) {
    --- End diff --
    
    How about sanity checking before logging that things are going to happen? 
Usually gives better logging insights...


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