You are viewing a plain text version of this content. The canonical link for it is here.
Posted to issues@flink.apache.org by "Tzu-Li (Gordon) Tai (JIRA)" <ji...@apache.org> on 2016/09/15 16:58:20 UTC
[jira] [Commented] (FLINK-4618) FlinkKafkaConsumer09 should start
from the next record on startup from offsets in Kafka
[ https://issues.apache.org/jira/browse/FLINK-4618?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15493927#comment-15493927 ]
Tzu-Li (Gordon) Tai commented on FLINK-4618:
--------------------------------------------
I've confirmed that the problem only exists in the 0.9 consumer.
[~melmoth] and [~mbarlocker], since you were the original reporters of the bug, would you want to work on fixing it and open a PR? You can ping me to help review when you're ready :)
Otherwise I can also pick it up. In any case, let me know ;)
> FlinkKafkaConsumer09 should start from the next record on startup from offsets in Kafka
> ---------------------------------------------------------------------------------------
>
> Key: FLINK-4618
> URL: https://issues.apache.org/jira/browse/FLINK-4618
> Project: Flink
> Issue Type: Bug
> Components: Kafka Connector
> Affects Versions: 1.1.2
> Environment: Flink 1.1.2
> Kafka Broker 0.10.0
> Hadoop 2.7.0
> Reporter: Melmoth
>
> **Original reported ticket title: Last kafka message gets consumed twice when restarting job**
> There seem to be an issue with the offset management in Flink. When a job is stopped and startet again, a message from the previous offset is read again.
> I enabled checkpoints (EXACTLY_ONCE) and FsStateBackend. I started with a new consumer group and emitted one record.
> You can cleary see, that the consumer waits for a new record at offset 4848911, which is correct. After restarting, it consumes a record at 4848910, causing the record to be consumed more than once.
> I checked the offset with the Kafka CMD tools, the commited offset in zookeeper is 4848910.
> Here is my log output:
> {code}
> 10:29:24,225 DEBUG org.apache.kafka.clients.NetworkClient - Initiating connection to node 2147482646 at hdp1:6667.
> 10:29:24,225 DEBUG org.apache.kafka.clients.consumer.internals.ConsumerCoordinator - Fetching committed offsets for partitions: [myTopic-0]
> 10:29:24,228 DEBUG org.apache.kafka.clients.NetworkClient - Completed connection to node 2147482646
> 10:29:24,234 DEBUG org.apache.kafka.clients.consumer.internals.ConsumerCoordinator - No committed offset for partition myTopic-0
> 10:29:24,238 DEBUG org.apache.kafka.clients.consumer.internals.Fetcher - Resetting offset for partition myTopic-0 to latest offset.
> 10:29:24,244 DEBUG org.apache.kafka.clients.consumer.internals.Fetcher - Fetched offset 4848910 for partition myTopic-0
> 10:29:24,245 TRACE org.apache.kafka.clients.consumer.internals.Fetcher - Added fetch request for partition myTopic-0 at offset 4848910
> 10:29:24,773 TRACE org.apache.kafka.clients.consumer.internals.Fetcher - Added fetch request for partition myTopic-0 at offset 4848910
> 10:29:25,276 TRACE org.apache.kafka.clients.consumer.internals.Fetcher - Added fetch request for partition myTopic-0 at offset 4848910
> -- Inserting a new event here
> 10:30:22,447 TRACE org.apache.kafka.clients.consumer.internals.Fetcher - Adding fetched record for partition myTopic-0 with offset 4848910 to buffered record list
> 10:30:22,448 TRACE org.apache.kafka.clients.consumer.internals.Fetcher - Returning fetched records at offset 4848910 for assigned partition myTopic-0 and update position to 4848911
> 10:30:22,451 TRACE org.apache.kafka.clients.consumer.internals.Fetcher - Added fetch request for partition myTopic-0 at offset 4848911
> 10:30:22,953 TRACE org.apache.kafka.clients.consumer.internals.Fetcher - Added fetch request for partition myTopic-0 at offset 4848911
> 10:30:23,456 TRACE org.apache.kafka.clients.consumer.internals.Fetcher - Added fetch request for partition myTopic-0 at offset 4848911
> 10:30:23,887 INFO org.apache.flink.runtime.checkpoint.CheckpointCoordinator - Triggering checkpoint 6 @ 1473841823887
> 10:30:23,957 TRACE org.apache.kafka.clients.consumer.internals.Fetcher - Added fetch request for partition myTopic-0 at offset 4848911
> 10:30:23,996 INFO org.apache.flink.runtime.checkpoint.CheckpointCoordinator - Completed checkpoint 6 (in 96 ms)
> 10:30:24,196 TRACE org.apache.kafka.clients.consumer.internals.ConsumerCoordinator - Sending offset-commit request with {myTopic-0=OffsetAndMetadata{offset=4848910, metadata=''}} to Node(2147482646, hdp1, 6667)
> 10:30:24,204 DEBUG org.apache.kafka.clients.consumer.internals.ConsumerCoordinator - Committed offset 4848910 for partition myTopic-0
> 10:30:24,460 TRACE org.apache.kafka.clients.consumer.internals.Fetcher - Added fetch request for partition myTopic-0 at offset 4848911
> 10:30:24,963 TRACE org.apache.kafka.clients.consumer.internals.Fetcher - Added fetch request for partition myTopic-0 at offset 4848911
> 10:30:48,057 INFO org.apache.flink.runtime.blob.BlobServer - Stopped BLOB server at 0.0.0.0:2946
> -- Restarting job
> 10:32:01,672 DEBUG org.apache.kafka.clients.NetworkClient - Initiating connection to node 2147482646 at hdp1:6667.
> 10:32:01,673 DEBUG org.apache.kafka.clients.consumer.internals.ConsumerCoordinator - Fetching committed offsets for partitions: [myTopic-0]
> 10:32:01,677 DEBUG org.apache.kafka.clients.NetworkClient - Completed connection to node 2147482646
> // See below! Shouldn't the offset be 4848911?
> 10:32:01,682 DEBUG org.apache.kafka.clients.consumer.internals.Fetcher - Resetting offset for partition myTopic-0 to the committed offset 4848910
> 10:32:01,683 TRACE org.apache.kafka.clients.consumer.internals.Fetcher - Added fetch request for partition myTopic-0 at offset 4848910
> 10:32:01,685 DEBUG org.apache.kafka.clients.NetworkClient - Initiating connection to node 1001 at hdp1:6667.
> 10:32:01,687 DEBUG org.apache.kafka.clients.NetworkClient - Completed connection to node 1001
> // Here record 4848910 gets consumed again!
> 10:32:01,707 TRACE org.apache.kafka.clients.consumer.internals.Fetcher - Adding fetched record for partition myTopic-0 with offset 4848910 to buffered record list
> 10:32:01,708 TRACE org.apache.kafka.clients.consumer.internals.Fetcher - Returning fetched records at offset 4848910 for assigned partition myTopic-0 and update position to 4848911
> 10:32:03,721 TRACE org.apache.kafka.clients.consumer.internals.Fetcher - Added fetch request for partition myTopic-0 at offset 4848911
> 10:32:04,224 TRACE org.apache.kafka.clients.consumer.internals.Fetcher - Added fetch request for partition myTopic-0 at offset 4848911
> 10:32:04,726 TRACE org.apache.kafka.clients.consumer.internals.Fetcher - Added fetch request for partition myTopic-0 at offset 4848911
> 10:32:04,894 INFO org.apache.flink.runtime.blob.BlobCache - Shutting down BlobCache
> 10:32:04,903 INFO org.apache.flink.runtime.blob.BlobServer - Stopped BLOB server at 0.0.0.0:3079
> {code}
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)