cameronlee314 commented on a change in pull request #918: SAMZA-2094: Implement
the StartpointVisitor for the KafkaSystemConsumer.
URL: https://github.com/apache/samza/pull/918#discussion_r258283701
##########
File path:
samza-kafka/src/main/java/org/apache/samza/system/kafka/KafkaSystemConsumer.java
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@@ -159,30 +179,16 @@ private void startSubscription() {
*/
void startConsumer() {
// set the offset for each TopicPartition
- if (topicPartitionsToOffset.size() <= 0) {
+ if (topicPartitionToStartpointMap.size() <= 0) {
LOG.error ("{}: Consumer is not subscribed to any SSPs", this);
}
- topicPartitionsToOffset.forEach((tp, startingOffsetString) -> {
- long startingOffset = Long.valueOf(startingOffsetString);
-
- try {
- synchronized (kafkaConsumer) {
- kafkaConsumer.seek(tp, startingOffset); // this value should already
be the 'upcoming' value
- }
- } catch (Exception e) {
- // all recoverable execptions are handled by the client.
- // if we get here there is nothing left to do but bail out.
- String msg =
- String.format("%s: Got Exception while seeking to %s for partition
%s", this, startingOffsetString, tp);
- LOG.error(msg, e);
- throw new SamzaException(msg, e);
- }
-
- LOG.info("{}: Changing consumer's starting offset for tp = {} to {}",
this, tp, startingOffsetString);
-
+ topicPartitionToStartpointMap.forEach((topicPartition, startpoint) -> {
+ Partition partition = new Partition(topicPartition.partition());
+ SystemStreamPartition systemStreamPartition = new
SystemStreamPartition(systemName, topicPartition.topic(), partition);
+ startpoint.apply(systemStreamPartition,
kafkaStartpointRegistrationHandler);
// add the partition to the proxy
- proxy.addTopicPartition(topicPartitionsToSSP.get(tp), startingOffset);
+ proxy.addTopicPartition(systemStreamPartition,
kafkaConsumer.position(topicPartition));
Review comment:
Looks like the previous comment about this got marked as "outdated".
Can this be moved into the registration handler? Seems like this
functionality would fall into the responsibility of that object.
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