[jira] [Created] (HBASE-27111) Make Netty channel bytebuf allocator configurable

["Andrew Kyle Purtell (Jira)" <ji...@apache.org>]

Andrew Kyle Purtell created HBASE-27111:
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             Summary: Make Netty channel bytebuf allocator configurable
                 Key: HBASE-27111
                 URL: https://issues.apache.org/jira/browse/HBASE-27111
             Project: HBase
          Issue Type: Sub-task
    Affects Versions: 2.5.0
            Reporter: Andrew Kyle Purtell
            Assignee: Andrew Kyle Purtell
             Fix For: 2.5.0, 3.0.0-alpha-3


Netty supports different strategies for allocating byte buffers for IO and channel modules. We do not allow the site operator to fine tune this but could. It would be particularly useful to allow preference of heap buffers where direct memory may be limited or utilized for other purposes. 

Support site configuration of the bytebuf allocator that Netty will use for NettyRpcServer channels. Property name is 'hbase.netty.rpcserver.allocator'. Default is no value, which is equivalent to "pooled". Valid values are:
- "pooled": use PooledByteBufAllocator
- "unpooled": use UnpooledByteBufAllocator
- "heap": use HeapByteBufAllocator, which is a PooledByteBufAllocator that preferentially allocates buffers on heap wherever possible



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