joaohmalves opened a new pull request, #38873:
URL: https://github.com/apache/beam/pull/38873
Implements the Delta Kernel Engine FileSystemClient interface backed by
Apache Beam's native FileSystems API. This provides the foundational
abstraction required for the Delta Lake conector to read/write metadata logs
across any Beam-supported storage layer (GCS, S3, HDFS, local files, etc.).
What changes
sdks/java/io/.../BeamFileSystemClient.java: Implements FileSystemClient.
Implements listFrom using FileSystems.match with lexicographical sorting; maps
readFiles to sequential bounded array stream reads; delegates delete and
copyFileAtomically using Beam's native lifecycle options (IGNORE_MISSING_FILES,
SKIP_IF_DESTINATION_EXISTS).
sdks/java/io/.../BeamEngine.java: Hooks up BeamFileSystemClient as the
default system client instance inside the engine constructors.
sdks/java/io/.../BeamFileSystemClientTest.java: Unit tests covering
filesystem operations, range reads, folder behavior, and ordering logic using
JUnit TemporaryFolder.
Fixes #38554.
------------------------
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