Github user StephanEwen commented on a diff in the pull request: https://github.com/apache/flink/pull/1341#discussion_r45462057 --- Diff: flink-streaming-connectors/flink-connector-kafka/src/main/java/org/apache/flink/streaming/connectors/kafka/FlinkKafkaConsumer.java --- @@ -567,6 +588,76 @@ public void notifyCheckpointComplete(long checkpointId) throws Exception { } return partitionsToSub; } + + /** + * Thread to periodically commit the current read offset into Zookeeper. + */ + private static class PeriodicOffsetCommitter extends Thread { + private long commitInterval; + private volatile boolean running = true; + private volatile Thread self; + private FlinkKafkaConsumer consumer; + private final Object stateUpdateLock = new Object(); + + public PeriodicOffsetCommitter(long commitInterval, FlinkKafkaConsumer consumer) { + this.commitInterval = commitInterval; + this.consumer = consumer; + this.self = this; + } + + @Override + public void run() { + try { + while (running) { + try { + Thread.sleep(commitInterval); + + // ------------ commit current offsets ---------------- + + // create copy of current offsets + long[] currentOffsets; + synchronized (stateUpdateLock) { + currentOffsets = Arrays.copyOf(consumer.lastOffsets, consumer.lastOffsets.length); + } + + Map<TopicPartition, Long> offsetsToCommit = new HashMap<>(); + for (TopicPartition tp : (List<TopicPartition>)consumer.subscribedPartitions) { + int partition = tp.partition(); + long offset = currentOffsets[partition]; + long lastCommitted = consumer.commitedOffsets[partition]; + + if (offset != OFFSET_NOT_SET) { + if (offset > lastCommitted) { + offsetsToCommit.put(tp, offset); + LOG.debug("Committing offset {} for partition {}", offset, partition); + } else { + LOG.debug("Ignoring offset {} for partition {} because it is already committed", offset, partition); + } + } + } + + consumer.offsetHandler.commit(offsetsToCommit); + } catch (InterruptedException e) { + if(running) { + // throw unexpected interruption + throw e; + } + // looks like the thread is being closed. Leave loop + break; + } + } + } catch (Throwable t) { + LOG.warn("Periodic checkpoint committer is stopping the fetcher because of an error", t); + consumer.fetcher.stopWithError(t); + } + } + + public void close() { + this.running = false; + this.self.interrupt(); --- End diff -- Same as if you do 'this.interrupt()'. Seems there is a confusion about `this` vs `Thread.currentThread()`. `this` is still the object reference, the thread represented by that reference, not the calling thread.
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