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https://issues.apache.org/jira/browse/FLINK-2974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15016673#comment-15016673
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ASF GitHub Bot commented on FLINK-2974:
---------------------------------------
Github user StephanEwen commented on a diff in the pull request:
https://github.com/apache/flink/pull/1341#discussion_r45461871
--- 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();
--- End diff --
You can probably drop this lock, it is used nowhere. If you want to lock,
you need to lock on the proper checkpoint lock.
Locking may not be necessary, as these offsets are only some rough
inaccurate notion of progress anyways, if checkpointing is not enabled.
> Add periodic offset commit to Kafka Consumer if checkpointing is disabled
> -------------------------------------------------------------------------
>
> Key: FLINK-2974
> URL: https://issues.apache.org/jira/browse/FLINK-2974
> Project: Flink
> Issue Type: Improvement
> Components: Kafka Connector
> Reporter: Robert Metzger
> Assignee: Robert Metzger
>
> Flink only writes the offsets from the consumer into ZK if checkpointing is
> enabled.
> We should have a similar feature to Kafka's autocommit in our consumer.
> Issue reported by user:
> http://stackoverflow.com/questions/33501574/flink-kafka-why-am-i-losing-messages
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