[jira] [Created] (HDDS-14161) Fix Ozone FS client returns null BlockLocations for zero-byte files

["Jayer (Jira)" <ji...@apache.org>]

Jayer created HDDS-14161:
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             Summary: Fix Ozone FS client returns null BlockLocations for zero-byte files
                 Key: HDDS-14161
                 URL: https://issues.apache.org/jira/browse/HDDS-14161
             Project: Apache Ozone
          Issue Type: Improvement
          Components: Ozone Client
    Affects Versions: 2.0.0
            Reporter: Jayer


Currently, the Ozone File System client's implementation of `org.apache.hadoop.fs.LocatedFileStatus.getBlockLocations()` returns null when the file size is 0 byte.

This behavior is inconsistent with the HDFS File System client, which correctly returns an empty `BlockLocation[]` array for zero-byte files, as per the standard Hadoop FileSystem API contract for files with no blocks.

This commit addresses the compatibility issue by modifying `OzoneFileSystem` to return an empty `BlockLocation[]` array when:
 # The file size is 0.
 # The internal block list is empty (which is true for 0-byte files). This change ensures better interoperability and seamless compatibility for applications relying on the expected behavior of the Hadoop FileSystem API. 



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