liviazhu opened a new pull request, #54277:
URL: https://github.com/apache/spark/pull/54277
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### What changes were proposed in this pull request?
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Previously, we try to create a new directory for offsets, commits, and state
in the checkpoint directory if they don't exist when running `StateDataSource`.
This is because the utility functions are shared with streaming query
functionality which needs to create these dirs if they don't exist. This change
creates new readOnly modes for the utilities so that datasources do not need to
mkdirs.
- **StreamingQueryCheckpointMetadata** – New `readOnly` parameter; when
true, passed to `OffsetSeqLog` and `CommitLog`.
- **HDFSMetadataLog** – New `readOnly` parameter. Directory creation is
skipped when `readOnly=true` unless `streamingCheckpointCreateDirOnRead` is
true. Comment added: create dir only when it’s not a read-only log or
createDirOnRead is true, and the metadata path does not exist.
- **CommitLog, OffsetSeqLog** – Accept and forward `readOnly` to
`HDFSMetadataLog`.
New configurations
- **`spark.sql.streaming.checkpoint.stateCreateMetadataDirOnRead`**
(default: false) – When true, the state data source reader may create metadata
dirs if missing; when false, it only reads existing dirs.
- **`spark.sql.streaming.checkpoint.createDirOnRead`** (default: false) –
When true, offset/commit log initialization may create the parent directory if
missing.
### Why are the changes needed?
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Allow usage of StateDataSource on checkpoints that are read-only.
### Does this PR introduce _any_ user-facing change?
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No
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New unit tests
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