goutamadwant opened a new pull request, #11819:
URL: https://github.com/apache/seatunnel/pull/11819
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### Purpose of this pull request
Fixes #10225.
This adds append-only text tailing to the LocalFile source by extending the
existing continuous discovery path.
- Emit only byte ranges ending at a complete row delimiter
- Checkpoint the committed offset for each active file
- Restore in-flight ranges and committed offsets without rereading completed
rows
- Support `earliest` and `latest` start modes
- Keep the existing binary update path and bounded LocalFile behavior
unchanged
The first slice is limited to uncompressed append-only text files. In-place
edits are not tracked. If truncation is detected, the current file length
becomes the new baseline instead of replaying the remaining file.
### Does this PR introduce _any_ user-facing change?
Yes. LocalFile sources using `file_format_type="text"`,
`discovery_mode="continuous"`, and `sync_mode="full"` can keep reading complete
rows appended after the job starts.
The existing default `discovery_mode="once"` remains bounded and unchanged.
### How was this patch tested?
Added regression coverage for complete and partial appended rows, duplicate
scan prevention, checkpoint restore, `earliest` and `latest` start modes,
header skipping, and explicit text split ranges.
Verified with:
```shell
./mvnw -pl
seatunnel-connectors-v2/connector-file/connector-file-base,seatunnel-connectors-v2/connector-file/connector-file-local
package
```
The file-base module passed 252 tests and the LocalFile module passed 26
tests.
### Check list
* [ ] If any new Jar binary package adding in your PR, please add License
Notice according
[New License
Guide](https://github.com/apache/seatunnel/blob/dev/docs/en/developer/new-license.md)
* [x] If necessary, please update the documentation to describe the new
feature. https://github.com/apache/seatunnel/tree/dev/docs
* [ ] If necessary, please update `incompatible-changes.md` to describe the
incompatibility caused by this PR.
* [ ] If you are contributing the connector code, please check that the
following files are updated:
1. Update
[plugin-mapping.properties](https://github.com/apache/seatunnel/blob/dev/plugin-mapping.properties)
and add new connector information in it
2. Update the pom file of
[seatunnel-dist](https://github.com/apache/seatunnel/blob/dev/seatunnel-dist/pom.xml)
3. Add ci label in
[label-scope-conf](https://github.com/apache/seatunnel/blob/dev/.github/workflows/labeler/label-scope-conf.yml)
4. Add e2e testcase in
[seatunnel-e2e](https://github.com/apache/seatunnel/tree/dev/seatunnel-e2e/seatunnel-connector-v2-e2e/)
5. Update connector
[plugin_config](https://github.com/apache/seatunnel/blob/dev/config/plugin_config)
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