eskabetxe commented on code in PR #29422:
URL: https://github.com/apache/flink/pull/29422#discussion_r4230492608
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docs/content/docs/deployment/filesystems/s3.md:
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@@ -153,6 +153,10 @@ The legacy configuration key `s3.path.style.access` is
still supported as a fall
The Native S3 FileSystem is a pure-Java implementation built on the AWS SDK v2
completely removing the dependency on Hadoop. It is registered under the
schemes *s3://* and *s3a://*. It provides a drop-in replacement for the Presto
and Hadoop implementations, supporting checkpointing, the [FileSink]({{< ref
"docs/connectors/datastream/filesystem" >}}) (via `RecoverableWriter`),
server-side encryption (SSE-S3, SSE-KMS), cross-account access via IAM role
assumption, entropy injection, and bulk copy via S3TransferManager.
+{{< hint info >}}
+**Switching from the Hadoop or Presto implementations:** jobs with pending or
in-progress `FileSink` part files in their state can be restored directly with
the Native S3 FileSystem — checkpoints and savepoints written by the
Hadoop/Presto recoverable-state format are detected and migrated on restore.
The reverse direction is **not** supported: state written by the Native S3
FileSystem cannot be restored with the Hadoop or Presto implementations. Drain
the job first (e.g. `stop-with-savepoint --drain`) before switching back.
+{{< /hint >}}
Review Comment:
Changed.
But same comment as before: if we are left behind the old formats, they
should not receive more changes.
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