[jira] [Updated] (KAFKA-3947) kafka-reassign-partitions.sh should support dumping current assignment

["Yuto Kawamura (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-3947?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yuto Kawamura updated KAFKA-3947:
---------------------------------
    Status: Patch Available  (was: In Progress)

> kafka-reassign-partitions.sh should support dumping current assignment
> ----------------------------------------------------------------------
>
>                 Key: KAFKA-3947
>                 URL: https://issues.apache.org/jira/browse/KAFKA-3947
>             Project: Kafka
>          Issue Type: Improvement
>          Components: tools
>    Affects Versions: 0.10.0.0
>            Reporter: Yuto Kawamura
>            Assignee: Yuto Kawamura
>            Priority: Minor
>             Fix For: 0.10.0.1
>
>
> When I building my own tool to perform reassignment of partitions, I realized that there's no way to dump the current partition assignment in machine parsable format such as JSON.
> Actually giving {{--generate}} option to the kafka-reassign-partitions.sh script dumps the current assignment of topic given by {{--topics-to-assign-json-file}} but it's very inconvenient because of:
> - I want the dump containing all topics. That is, I wanna skip generating the list of current topics to pass it to the generate command.
> - The output is concatenated with the result of reassignment so can't do simply something like: {{kafka-reassign-partitions.sh --generate ... > current-assignment.json}}
> - Don't need to ask kafka to generate reassginment to get the current assignment in the first place.
> Here I'd like to add the {{--dump}} option to kafka-reassign-partitions.sh.
> I was wondering whether this functionality should be provided by {{kafka-reassign-partitions.sh}} or {{kafka-topics.sh}} but now I think {{kafka-reassign-partitions.sh}} should be much proper as the resulting JSON should be in the format of {{--reassignment-json-file}} which sticks to this command.
> Will follow up the patch implements this shortly.



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