Anoop Sam John created HBASE-13819:
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Summary: Make RPC layer CellBlock buffer a DirectByteBuffer
Key: HBASE-13819
URL: https://issues.apache.org/jira/browse/HBASE-13819
Project: HBase
Issue Type: Sub-task
Reporter: Anoop Sam John
Assignee: Anoop Sam John
Fix For: 2.0.0
In RPC layer, when we make a cellBlock to put as RPC payload, we will make an
on heap byte buffer (via BoundedByteBufferPool). The pool will keep upto
certain number of buffers. This jira aims at testing possibility for making
this buffers off heap ones. (DBB) The advantages
1. Unsafe based writes to off heap is faster than that to on heap. Now we are
not using unsafe based writes at all. Even if we add, DBB will be better
2. When Cells are backed by off heap (HBASE-11425) off heap to off heap writes
will be better
3. When checked the code in SocketChannel impl, if we pass a HeapByteBuffer to
the socket channel, it will create a temp DBB and copy data to there and only
DBBs will be moved to Sockets. If we make DBB 1st hand itself, we can avoid
this one more level of copying.
Will do different perf testing with changed and report back.
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