[core] Retry snapshot existence checks after I/O failures - #9707
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Purpose
SnapshotManager#snapshotExistscurrently fails immediately whenFileIO#existsthrows anIOException. A transient file system failure can therefore interrupt callers such as lookup cache refresh.Retry the existence check up to three attempts with a one-second interval. Preserve the last
IOExceptionif all attempts fail, and restore the interrupt status if the retry wait is interrupted.Tests
IOException.API and Format
No API or format changes.
Documentation
No documentation changes.