[FLINK-3730] Fix RocksDB Local Directory Initialization

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.0.2, 1.1.0
• Component/s: Runtime / State Backends
• Assignee: Aljoscha Krettek
• Reporter: Aljoscha Krettek
• Created: 11/Apr/16 16:54
• Updated: 28/Feb/19 10:46
• Resolved: 13/Apr/16 08:37

Description

The test that checks whether a directory is viable is not correct and the tests in `RocksDBStateBackendConfigTest` fail to catch them: `testFailWhenNoLocalStorageDir()` and `testContinueOnSomeDbDirectoriesMissing()`

The problem is that the backend tests whether the dir exists or can be created. The tests create the directory and set it to non-writable. This means that the check accepts these. The job would only fail later when actually trying to create a directory in the initialized data directory.