Not sure why HadoopArchives was removed, nor why HarFileSystem was removed. Was the latter replaced by something else?
As a stop-gap I've just resusitated both classes (see patch). Is that a good idea, or is there an alternative to HadoopArchives and/or HarFileSystem that should be used instead.
Wrt. unit test, I could not locate the accompanying test class for HadoopArchives just before
HADOOP-7108 was applied, although I did find a copy here:
although the package structure does not match 1-to-1 probably due to mapreduce split from core.
Would it be appropriate to apply this unit test as part of this patch?
Ditto for TestHarFileSystem found on same URL as listed above. Should I add this back in as well as part of patch for this bug?