[jira] [Created] (HBASE-21921) Notify users if the ByteBufAllocator is always allocating ByteBuffers from heap which means the increacing GC pressure

[Zheng Hu (JIRA)]

Zheng Hu created HBASE-21921:
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             Summary: Notify users if the ByteBufAllocator is always allocating 
ByteBuffers from heap which means the increacing GC pressure
                 Key: HBASE-21921
                 URL: https://issues.apache.org/jira/browse/HBASE-21921
             Project: HBase
          Issue Type: Sub-task
            Reporter: Zheng Hu
            Assignee: Zheng Hu


As the javadoc of ByteBuffAllocator says: 
{code}
There's possible that the desired memory size is large than ByteBufferPool has, 
we'll downgrade to allocate ByteBuffers from heap which meaning the GC pressure 
may increase again. Of course, an better way is increasing the ByteBufferPool 
size if we detected this case. 
{code}

So I think we need some messages to remind the user that an larger 
ByteBufferPool size may be better. 



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