Andrew Wong created KUDU-2286:
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Summary: 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
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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