Github user chandrasaripaka commented on the issue:
https://github.com/apache/carbondata/pull/2161
@chenliang613 This PR is for supporting the Alluxio as a File System for
supporting the CarbonFileFormat. Though there was a AlluxioCarbonFile in the
past, this was failing with Alluxio. Since Alluxio does not inherit
DistributedFileSystem, it has to be a HadoopFileSystem that will be the change,
as technically it does not support the appends on the File. Also, adopting to a
AlluxioLock, however one can also use the ZookeeperLock, and also navigate.
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