[HBASE-22412] Improve the metrics in ByteBuffAllocator

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Hadoop Flags: Reviewed
• Assignee: Zheng Hu
• Reporter: Zheng Hu
• Created: 14/May/19 08:13
• Updated: 27/Jun/19 12:51
• Resolved: 20/May/19 06:41

Description

gAddress the comment in HBASE-22387:

The ByteBuffAllocator#getFreeBufferCount will be O(N) complexity, because the buffers here is an ConcurrentLinkedQueue. It's worth file an issue for this.

Also I think we should use the allcated bytes instead of allocation number to evaluate the heap allocation percent , so that we can decide whether the ByteBuffer is too small and whether will have higher GC pressure. Assume the case: the buffer size is 64KB, and each time we have a block with 65KB, then it will have one heap allocation (1KB) and one pool allocation (64KB), if only consider the allocation num, then the heap allocation ratio will be 1 / (1 + 1) = 50%, but if consider the allocation bytes, the allocation ratio will be 1KB / 65KB = 1.5%.

If the heap allocation percent is less than hbase.ipc.server.reservoir.minimal.allocating.size / hbase.ipc.server.allocator.buffer.size, then the allocator works fine, otherwise it's overload.

Issue Links

• links to: Review board