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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