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https://issues.apache.org/jira/browse/KAFKA-4204?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15517207#comment-15517207
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Apurva Mehta commented on KAFKA-4204:
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Another issue with `KafkaService.verify_reassign_partitions`: it doesn't
explicitly check for reassignment failure. Ie. any completion is a success.
This means that it reports success even if the reassignment completely failed.
This also needs to be addressed by any fix associated with this ticket.
> KafkaService.verify_reassign_partitions is a no-op
> ---------------------------------------------------
>
> Key: KAFKA-4204
> URL: https://issues.apache.org/jira/browse/KAFKA-4204
> Project: Kafka
> Issue Type: Bug
> Components: core
> Affects Versions: 0.10.0.1
> Reporter: Apurva Mehta
> Assignee: Apurva Mehta
>
> In the 'verify_reassign_partitions' method of the KafkaService class in the
> system tests, we execute the kafka-reassign-partitions command and then do a
> regular expression match on the tools output to verify that the reassignment
> succeeded.
> In particular, we search for the pattern 'is in progress' in the output
> string. If the pattern exists, it means that the reassignment is still in
> progress.
> As it stands, this mechanism is broken because the tool outputs 'is still in
> progress' for each reassignment which hasn't completed. Further, the tool
> outputs a multi-line string, but the regex does not factor this in.
> In general, depending on a specific pattern on stdout to determine success or
> failure of an operation like reassignment is very fragile.
> The right thing to do would be for the tool to output a well defined data
> structure, which can be accurately interpreted by the test or any other
> program which needs that information.
> This JIRA is going to track the discussion and progress for implementing the
> latter.
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