Andrew Wong updated KUDU-2286:
    Labels: 1.8  (was: )

> Redistribute tablet data when removing directories
> --------------------------------------------------
>                 Key: KUDU-2286
>                 URL: https://issues.apache.org/jira/browse/KUDU-2286
>             Project: Kudu
>          Issue Type: Improvement
>          Components: fs, tablet
>            Reporter: Andrew Wong
>            Priority: Major
>              Labels: 1.8
> Today, the `update_dirs` tool will allow the removal of a directory, even if 
> tablet data exists on it. For tablet servers, this means upon the next 
> startup, those tablets will be re-replicated to other servers. For masters, 
> this means the node will crash.
> While a well-provisioned Kudu cluster should be able to handle both of these 
> cases, it would be nice to redistribute the tablet's data locally to avoid 
> either outcome. This entails moving the data blocks from the removed 
> directory, and rewriting the tablet metadata (which keeps a record of the 
> data directories across which the tablet's data is stored) to exclude the 
> removed directory.

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