Steve Loughran created HADOOP-13047:
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Summary: S3a Forward seek in stream length to be configurable
Key: HADOOP-13047
URL: https://issues.apache.org/jira/browse/HADOOP-13047
Project: Hadoop Common
Issue Type: Sub-task
Components: fs/s3
Affects Versions: 2.8.0
Reporter: Steve Loughran
Even with lazy seek, tests can show that sometimes a short-distance forward
seek is triggering a close + reopen, because the threshold for the seek is
simply available bytes in the inner stream.
A configurable threshold would allow data to be read and discarded before that
seek. This should be beneficial over long-haul networks as the time to set up
the TCP channel is high, and TCP-slow-start means that the ramp up of bandwidth
is slow. In such deployments, it will better to read forward than re-open,
though the exact "best" number will vary with client and endpoint.
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