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Posted to issues@flink.apache.org by "Nico Kruber (JIRA)" <ji...@apache.org> on 2017/07/31 13:49:00 UTC

[jira] [Created] (FLINK-7310) always use HybridMemorySegment

Nico Kruber created FLINK-7310:
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             Summary: always use HybridMemorySegment
                 Key: FLINK-7310
                 URL: https://issues.apache.org/jira/browse/FLINK-7310
             Project: Flink
          Issue Type: Improvement
          Components: Core
    Affects Versions: 1.4.0
            Reporter: Nico Kruber
            Assignee: Nico Kruber


For future changes to the network buffers (sending our own off-heap buffers through to netty), we cannot use {{HeapMemorySegment}} anymore and need to rely on {{HybridMemorySegment}} instead.

We should thus drop any code that loads the {{HeapMemorySegment}} (it is still available if needed) in favour of the {{HybridMemorySegment}} which is able to work on both heap and off-heap memory.

FYI: For the performance penalty of this change compared to using {{HeapMemorySegment}} alone, see this interesting blob article (from 2015):
https://flink.apache.org/news/2015/09/16/off-heap-memory.html



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