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From "Maxime Brugidou (JIRA)" <j...@apache.org>
Subject [jira] [Created] (KAFKA-693) Consumer rebalance fails if no leader available for a partition and stops all fetchers
Date Fri, 11 Jan 2013 09:24:12 GMT
Maxime Brugidou created KAFKA-693:
-------------------------------------

             Summary: Consumer rebalance fails if no leader available for a partition and
stops all fetchers
                 Key: KAFKA-693
                 URL: https://issues.apache.org/jira/browse/KAFKA-693
             Project: Kafka
          Issue Type: Bug
          Components: core
    Affects Versions: 0.8
            Reporter: Maxime Brugidou
         Attachments: mirror_debug.log, mirror.log

I am currently experiencing this with the MirrorMaker but I assume it happens for any rebalance.
The symptoms are:

I have replication factor of 1

1. If i start the MirrorMaker (bin/kafka-run-class.sh kafka.tools.MirrorMaker --consumer.config
mirror-consumer.properties  --producer.config mirror-producer.properties --blacklist 'xdummyx'
--num.streams=1 --num.producers=1) with a broker down
1.1 I set the refresh.leader.backoff.ms to 600000 (10min) so that the ConsumerFetcherManager
doesn't retry to often to get the unavailable partitions
1.2 The rebalance starts at the init step and fails: Exception in thread "main" kafka.common.ConsumerRebalanceFailedException:
KafkaMirror_mirror-01-1357893495345-fac86b15 can't rebalance after 4 retries
1.3 After the exception, everything stops (fetchers and queues)
1.4 I attached the full logs (info & debug) for this case

2. If i start the MirrorMaker with all the brokers up and then kill a broker
2.1 The first rebalance is successful
2.2 The consumer will handle correctly the broker down and stop the associated ConsumerFetcherThread
2.3 The refresh.leader.backoff.ms to 600000 works correctly
2.4 If something triggers a rebalance (new topic, partition reassignment...), then we go back
to 1., the rebalance fails and stops everything.

I think the desired behavior is to consumer whatever is available, and try later at some intervals.
I would be glad to help on that issue although the Consumer code seems a little tough to get
on.

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