Github user zsxwing commented on the issue:
https://github.com/apache/spark/pull/13513
@frreiss SPARK-17165 (#14728) uses `SeenFilesMap.lastPurgeTimestamp` to
ignore files. when recovering from failure, `SeenFilesMap.lastPurgeTimestamp`
will be set via the files in the metadata log. File paths not stored in the
memory but older than `SeenFilesMap.lastPurgeTimestamp` won't be processed.
Therefore, it doesn't need to store unbounded state.
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