Lars Hofhansl created HBASE-7755:
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Summary: Experiment with LAB in BlockEndcoding
Key: HBASE-7755
URL: https://issues.apache.org/jira/browse/HBASE-7755
Project: HBase
Issue Type: Bug
Reporter: Lars Hofhansl
I was looking at and profiling the BlockEncoding code to figure out how to make
it faster. One issue that jumped out was we call ByteBuffer.allocate(...) for
each single KV.
As an experiment I tried using the MemStoreLAB code to allocate those buffers.
Here are some preliminary numbers, all scanning 10m rows (all in cache):
* no encoding: 5.2s
* FAST_DIFF without patch: 7.3s
* FAST_DIFF with patch and small LAB: 4.1s
* FAST_DIFF with patch and large LAB: 11s
So this is very sensitive to the right sizing of the LAB.
Need to do a bit more testing, but it seems that there is a chance to actually
make scanning with block encoding faster than without!
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