[jira] [Created] (FLINK-6647) Fail-fast on invalid RocksDBStateBackend configuration

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

Andrey created FLINK-6647:
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             Summary: Fail-fast on invalid RocksDBStateBackend configuration
                 Key: FLINK-6647
                 URL: https://issues.apache.org/jira/browse/FLINK-6647
             Project: Flink
          Issue Type: Bug
            Reporter: Andrey


Currently:
* setup "state.backend.rocksdb.checkpointdir=hdfs:///some/base/path/hdfs"
* setup backend: state.backend: "org.apache.flink.contrib.streaming.state.RocksDBStateBackendFactory"
* rocksdb doesn't support hdfs backend so in logs:
{code}
2017-05-19 15:42:33,737 ERROR org.apache.flink.contrib.streaming.state.RocksDBStateBackend - Local DB files directory '/some/base/path/hdfs' does not exist and cannot be created.
{code}
* however job continue execution and IOManager temp directory will be picked up for rocksdb files.

There are several issues with such approach:
* after "ERROR" message printed and before developer fixes configuration, /tmp directory/partition might run out of disk space.
* if hdfs base path is the same as local path, then no errors in logs and rocksdb files will be written into an incorrect location. For example: "hdfs:///home/flink/data" will cause an issue.

Expected:
* validate URI and throw IllegalArgumentException like already implemented in "RocksDBStateBackend.setDbStoragePaths" method.



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