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folding into direct buffers is faster

This commit is contained in:
Xavier Léauté 2014-03-26 17:13:41 -07:00
parent 83ac1d323e
commit c92fd6f45d
1 changed files with 3 additions and 2 deletions
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5
processing/src/main/java/io/druid/query/aggregation/hyperloglog/HyperUniquesBufferAggregator.java
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@ -66,10 +66,11 @@ public class HyperUniquesBufferAggregator implements BufferAggregator
@Override @Override
public Object get(ByteBuffer buf, int position) public Object get(ByteBuffer buf, int position)
{ {
ByteBuffer dataCopyBuffer = ByteBuffer.allocate(HyperLogLogCollector.getLatestNumBytesForDenseStorage()); ByteBuffer dataCopyBuffer = ByteBuffer.allocateDirect(HyperLogLogCollector.getLatestNumBytesForDenseStorage());
ByteBuffer mutationBuffer = buf.duplicate(); ByteBuffer mutationBuffer = buf.duplicate();
mutationBuffer.position(position); mutationBuffer.position(position);
mutationBuffer.get(dataCopyBuffer.array()); dataCopyBuffer.put(mutationBuffer);
dataCopyBuffer.rewind();
return HyperLogLogCollector.makeCollector(dataCopyBuffer); return HyperLogLogCollector.makeCollector(dataCopyBuffer);
} }