6c6d1b64d4
This switches the default behavior of S3A output streams to warning that Syncable.hsync() or hflush() have been called; it's not considered an error unless the defaults are overridden. This avoids breaking applications which call the APIs, at the risk of people trying to use S3 as a safe store of streamed data (HBase WALs, audit logs etc). Contributed by Steve Loughran.