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https://issues.apache.org/jira/browse/KAFKA-2857?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15861796#comment-15861796
]
ASF GitHub Bot commented on KAFKA-2857:
---------------------------------------
GitHub user vahidhashemian opened a pull request:
https://github.com/apache/kafka/pull/2538
KAFKA-2857: Retry querying the consumer group while initializing
This applies to new-consumer based groups and would avoid scenarios in
which user issues a `--describe` query while the group is initializing.
Example: The following could occur for a newly created group.
```
kafka@kafka:~/workspace/kafka$ bin/kafka-consumer-groups.sh
--bootstrap-server localhost:9092 --describe --group g
Note: This will only show information about consumers that use the Java
consumer API (non-ZooKeeper-based consumers).
Error: Executing consumer group command failed due to The group coordinator
is not available.
```
With this PR the group is queried repeatedly at specific intervals within a
preset (and configurable) timeout `group-init-timeout` to circumvent
unfortunate situations like above.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/vahidhashemian/kafka KAFKA-2857
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/kafka/pull/2538.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #2538
----
commit 1e801041793d47bff2f3a4414b4bb7c3dd27ad04
Author: Vahid Hashemian <vahidhashem...@us.ibm.com>
Date: 2017-02-09T20:48:10Z
KAFKA-2857: Retry querying the consumer group while the group initializes
This applies to new-consumer based groups and would avoid scenarios in
which user issues a `--describe` query while the group is stabilizing.
Example: The following could occur for a newly created group.
```
kafka@kafka:~/workspace/kafka$ bin/kafka-consumer-groups.sh
--bootstrap-server localhost:9092 --describe --group g
Note: This will only show information about consumers that use the Java
consumer API (non-ZooKeeper-based consumers).
Error: Executing consumer group command failed due to The group coordinator
is not available.
```
With this PR the group is queried repeatedly at specific intervals within a
preset (and configurable) timeout `group-init-timeout` to circumvent
unfortunate situations like above.
----
> ConsumerGroupCommand throws GroupCoordinatorNotAvailableException when
> describing a non-existent group before the offset topic is created
> -----------------------------------------------------------------------------------------------------------------------------------------
>
> Key: KAFKA-2857
> URL: https://issues.apache.org/jira/browse/KAFKA-2857
> Project: Kafka
> Issue Type: Bug
> Components: tools
> Reporter: Ismael Juma
> Assignee: Vahid Hashemian
> Priority: Minor
>
> If we describe a non-existing group before the offset topic is created, like
> the following:
> {code}
> bin/kafka-consumer-groups.sh --bootstrap-server localhost:9092 --new-consumer
> --describe --group gggg
> {code}
> We get the following error:
> {code}
> Error while executing consumer group command The group coordinator is not
> available.
> org.apache.kafka.common.errors.GroupCoordinatorNotAvailableException: The
> group coordinator is not available.
> {code}
> The exception is thrown in the `adminClient.describeConsumerGroup` call. We
> can't interpret this exception as meaning that the group doesn't exist
> because it could also be thrown f all replicas for a offset topic partition
> are down (as explained by Jun).
> Jun also suggested that we should distinguish if a coordinator is not
> available from the case where a coordinator doesn't exist.
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