tr0k opened a new pull request, #7972:
URL: https://github.com/apache/hbase/pull/7972
## What this changes
This PR fixes HBASE-29875 in two commits:
1. Guard `DefaultStoreFileManager.getUnneededFiles` against null readers
2. Filter null-reader files before compaction selection in
`SortedCompactionPolicy`
## Why
In our 2.5.10/2.5.11 production environment, some stores reached a state
where `HStoreFile.getReader()` returned null. This caused compaction
paths to fail and blocked compaction progress for affected stores.
## Validation
Validated on a downstream 2.5.10/2.5.11-based build with Java 11 and with:
- TTL enabled
- frequent flushes
- MOB workload
- manual and automatic compaction triggering
Observed result:
- the known null-reader failure paths are avoided
- healthy files can still be compacted
- skipped null-reader files no longer abort compaction selection
## Notes
This is a defensive fix around unexpected null-reader state. It does not
attempt to solve the root cause of why some `HStoreFile` instances end up
with `reader == null`.
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