steveloughran opened a new pull request #2801:
URL: https://github.com/apache/hadoop/pull/2801
Adds a new option fs.s3a.downgrade.syncable.exceptions
Which converts calls to Syncable hsync/hflush on S3A output streams to
* log once at warn (for entire process life, not just the stream)
* increment IOStats with the relevant operation counter
With the downgrade not enabled (default)
* IOStats also incremented
* The UnsupportedOperationException current raised includes a link to this
JIRA
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