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  1. Apache Nemo
  2. NEMO-397

Separation of JVM heap region and off-heap memory region

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      In order to avoid memory overuse ahead of time,  which may lead to executor failure, we have to safely separate the portions of memory that the JVM heap, off-heap and 'slack' share. The current implementation ([PR: NEMO-388|https://github.com/apache/incubator-nemo/pull/223]) does not guarantee this, allocating the off-heap memory on-demand. Off-heap region size will be given as a ratio of executor memory just like the slack size. Since off-heap memory is used in various types of Blocks, off-heap memory should be retained. 

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            haeyoon Haeyoon Cho
            haeyoon Haeyoon Cho
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