LocalFS is a subclass of filterFS, but overrides create and open so that checksums are created and read.
MAPREDUCE-7184 has thrown up that the new builder openFile() call is being forwarded to the innerFS without CRC checking. Reviewing/fixing that has shown that some of the create methods aren't being correctly wrapped, so not generating CRCs
- createFile() builder
The following create calls
This means that applications using these methods, directly or indirectly to create files aren't actually generating checksums.
Fix: implement these methods & relay to local create calls, not to the inner FS.