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https://issues.apache.org/jira/browse/GOBBLIN-1040?focusedWorklogId=396259&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-396259
]
ASF GitHub Bot logged work on GOBBLIN-1040:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 02/Mar/20 17:47
Start Date: 02/Mar/20 17:47
Worklog Time Spent: 10m
Work Description: vikrambohra commented on pull request #2900:
[GOBBLIN-1040] HighLevelConsumer re-design by removing references to …
URL: https://github.com/apache/incubator-gobblin/pull/2900#discussion_r386547675
##########
File path:
gobblin-modules/gobblin-kafka-09/src/main/java/org/apache/gobblin/kafka/client/Kafka09ConsumerClient.java
##########
@@ -160,14 +164,30 @@ public long getLatestOffset(KafkaPartition partition)
throws KafkaOffsetRetrieva
this.consumer.assign(Lists.newArrayList(new
TopicPartition(partition.getTopicName(), partition.getId())));
this.consumer.seek(new TopicPartition(partition.getTopicName(),
partition.getId()), nextOffset);
- ConsumerRecords<K, V> consumerRecords =
consumer.poll(super.fetchTimeoutMillis);
- return Iterators.transform(consumerRecords.iterator(), new
Function<ConsumerRecord<K, V>, KafkaConsumerRecord>() {
+ return consume();
+ }
- @Override
- public KafkaConsumerRecord apply(ConsumerRecord<K, V> input) {
- return new Kafka09ConsumerRecord<>(input);
- }
- });
+ @Override
+ public synchronized Iterator<KafkaConsumerRecord> consume() {
Review comment:
Underlying Kafka Consumer is not thread safe. consume() commitAsync(),
committed() all try to acquire a lock (and they are different threads) the
consumer throws a ConcurrentModificationException if it detects that the lock
has been acquired by another thread.
/**
* Acquire the light lock protecting this consumer from multi-threaded
access. Instead of blocking
* when the lock is not available, however, we just throw an exception
(since multi-threaded usage is not
* supported).
* @throws IllegalStateException if the consumer has been closed
* @throws ConcurrentModificationException if another thread already has
the lock
*/
private void acquire() {
ensureNotClosed();
long threadId = Thread.currentThread().getId();
if (threadId != currentThread.get() &&
!currentThread.compareAndSet(NO_CURRENT_THREAD, threadId))
throw new ConcurrentModificationException("KafkaConsumer is not
safe for multi-threaded access");
refcount.incrementAndGet();
}
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Issue Time Tracking
-------------------
Worklog Id: (was: 396259)
Time Spent: 3h 10m (was: 3h)
> Fix High level consumer
> ------------------------
>
> Key: GOBBLIN-1040
> URL: https://issues.apache.org/jira/browse/GOBBLIN-1040
> Project: Apache Gobblin
> Issue Type: Improvement
> Reporter: Vikram Bohra
> Priority: Major
> Time Spent: 3h 10m
> Remaining Estimate: 0h
>
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