Flink: Add FlinkFileSystemFileIO delegating to Flink's FileSystem - #16411
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Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Generated-by: Claude Opus 5 (1M context)
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…rPool Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0199zqP4fzgJdmPufkMaiamu Generated-by: Claude Code
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What & why
Resolves #15352.
Flink ships pluggable FileSystem implementations (S3, HDFS, GCS, ...) that a Flink job already configures once for checkpoints and savepoints, including delegation-token and plugin-based authentication. Until now an Iceberg-on-Flink user had to separately re-configure Iceberg's FileIO for the same storage. FlinkFileSystemFileIO is a FileIO that discovers and delegates to Flink's FileSystem, removing the duplicate configuration and inheriting Flink FileSystem features such as delegation tokens (only the JobManager authenticates with Kerberos; TaskManagers reuse the token).
It is opt-in via the catalog's io-impl property (CatalogProperties.FILE_IO_IMPL) and must not be set through table properties, since other engines cannot use Flink's FileSystem. There are no core/api changes, so core stays engine-agnostic.
This revives #10151 by @pvary, which was closed only by the stale bot for inactivity, and targets the default Flink line (2.1) with a few modernizations:
Follow-up PRs will port the same change to the other supported Flink lines (1.20 and 2.0).
Tests
TestFlinkFileSystemFileIO (added for v2.1): list-prefix at scale, file existence, prefix delete, bulk delete + bulk-delete error handling, read/write roundtrip, and Flink Kryo + Java serialization. All 8 tests pass on the v2.1 tree; spotlessApply and checkstyle (main + test) pass.
Closes #15352
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