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

["Aljoscha Krettek (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-7310?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aljoscha Krettek reopened FLINK-7310:
-------------------------------------

Reopen to fix release note.

> always use HybridMemorySegment
> ------------------------------
>
>                 Key: FLINK-7310
>                 URL: https://issues.apache.org/jira/browse/FLINK-7310
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Core
>    Affects Versions: 1.4.0
>            Reporter: Nico Kruber
>            Assignee: Nico Kruber
>             Fix For: 1.4.0
>
>
> 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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