Github user wenlong88 commented on the issue:
https://github.com/apache/flink/pull/3595
@greghogan Currently we check the position with the EndPosition which is
the size of buffer instead of a max written size , so it is still possible to
leave holes when keeping unmodified. Enabling auto extending can give the user
the flexibility to reserved some space for later filling and does not change
current functions logics.
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