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From Balaji Rajagopalan <balaji.rajagopa...@olacabs.com>
Subject Re: Leader not found
Date Tue, 19 Apr 2016 16:05:39 GMT
Flink version : 1.0.0
Kafka version : 0.8.2.1

Try to use a topic which has no message posted to it, at the time flink
starts.

On Tue, Apr 19, 2016 at 5:41 PM, Robert Metzger <rmetzger@apache.org> wrote:

> Can you provide me with the exact Flink and Kafka versions you are using
> and the steps to reproduce the issue?
>
> On Tue, Apr 19, 2016 at 2:06 PM, Balaji Rajagopalan <
> balaji.rajagopalan@olacabs.com> wrote:
>
>> It does not seem to fully work if there is no data in the kafka stream,
>> the flink application emits this error and bails, could this be missed use
>> case in the fix.
>>
>> On Tue, Apr 19, 2016 at 3:58 PM, Robert Metzger <rmetzger@apache.org>
>> wrote:
>>
>>> Hi,
>>>
>>> I'm sorry, the documentation in the JIRA issue is a bit incorrect. The
>>> issue has been fixed in all versions including and after 1.0.0. Earlier
>>> releases (0.10, 0.9) will fail when the leader changes.
>>> However, you don't necessarily need to upgrade to Flink 1.0.0 to resolve
>>> the issue: With checkpointing enabled, your job will fail on a leader
>>> change, then Flink will restart the Kafka consumers and they'll find the
>>> new leaders.
>>> Starting from Flink 1.0.0 the Kafka consumer will handle leader changes
>>> without failing.
>>>
>>> Regards,
>>> Robert
>>>
>>> On Tue, Apr 19, 2016 at 12:17 PM, Balaji Rajagopalan <
>>> balaji.rajagopalan@olacabs.com> wrote:
>>>
>>>> I am facing this exception repeatedly while trying to consume from
>>>> kafka topic. It seems it was reported in 1.0.0 and fixed in 1.0.0, how can
>>>>  I be sure that is fixed in the version of flink that I am using, does it
>>>> require me to install patch updates ?
>>>>
>>>> Caused by: java.lang.RuntimeException: Unable to find a leader for
>>>> partitions: [FetchPartition {topic=capi, partition=0, offset=-915623761776}]
>>>> at
>>>> org.apache.flink.streaming.connectors.kafka.internals.LegacyFetcher.findLeaderForPartitions(LegacyFetcher.java:323)
>>>> at
>>>> org.apache.flink.streaming.connectors.kafka.internals.LegacyFetcher.run(LegacyFetcher.java:162)
>>>> at
>>>> org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumer08.run(FlinkKafkaConsumer08.java:316)
>>>> at
>>>> org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:78)
>>>> at
>>>> org.apache.flink.streaming.runtime.tasks.SourceStreamTask.run(SourceStreamTask.java:56)
>>>> at
>>>> org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:224)
>>>> at org.apache.flink.runtime.taskmanager.Task.run(Task.java:559)
>>>> at java.lang.Thread.run(Thread.java:745)
>>>>
>>>> https://issues.apache.org/jira/browse/FLINK-3368
>>>>
>>>
>>>
>>
>

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