Github user tcondie commented on the issue:
https://github.com/apache/spark/pull/15626
All log are now uniformly marshall entries to JSON. Each log has a
particular way of organizing its JSON entries:
HDFSMetadataLog:
Each Batch ID is a separate file.
All log entries within a batch id are serialized in one line.
OffsetSeqLog:
Each Batch ID is a separate file.
All log entries (i.e., Offsets) are separated by a newline character
i.e., one offset entry per line.
CompactibleFileStreamLog, FileStreamSinkLog, and FileStreamSourceLog
No changes to log file format i.e., log entries are separated by a new
line character.
Log entry -> JSON serialization is now done in CompactibleFileStreamLog
directly.
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