Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/1084#issuecomment-137782086
How hard is it to support the truncate file code path also for regular Unix
file systems (rather than only HDFS 2.7+)?
The reason is that this way we would support mounted file systems (NAS,
EBS) and MapR file system (exposes also a regular Unix file system interface)
in a seamless exactly once way (no need to have readers that are aware of the
metadata files).
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