Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/1222#issuecomment-55832295
Finally got around to this. Let me know what you think of the approach.
Note about the approach: adding a header to the files is not optimal
because it makes it harder for any code that is not Spark to read the file. If
that's something that we want to support, some public API might need to be
added.
An alternative approach would be to have a small metadata file saved
side-by-side with the event log. This, I think, is actually worse than the log
directory, because the inode for the small file would contain block data for
it, which probably would end up being larger than the inode data for the empty
nodes currently used by the directory-based approach.
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