@Override
protected void doWriteTo(StreamOutput out) throws IOException {
ValueFormatterStreams.writeOptional(valueFormatter, out);
out.writeInt(keys.length);
for (int i = 0; i < keys.length; ++i) {
out.writeDouble(keys[i]);
}
out.writeLong(state.getHighestToLowestValueRatio());
ByteBuffer stateBuffer = ByteBuffer.allocate(state.getNeededByteBufferCapacity());
state.encodeIntoCompressedByteBuffer(stateBuffer);
out.writeByteArray(stateBuffer.array());
out.writeBoolean(keyed);
}
@Override
public AbstractInternalHDRPercentiles doReduce(
List<InternalAggregation> aggregations, ReduceContext reduceContext) {
DoubleHistogram merged = null;
for (InternalAggregation aggregation : aggregations) {
final AbstractInternalHDRPercentiles percentiles =
(AbstractInternalHDRPercentiles) aggregation;
if (merged == null) {
merged = new DoubleHistogram(percentiles.state);
merged.setAutoResize(true);
}
merged.add(percentiles.state);
}
return createReduced(getName(), keys, merged, keyed, pipelineAggregators(), getMetaData());
}
@Override
protected void doReadFrom(StreamInput in) throws IOException {
valueFormatter = ValueFormatterStreams.readOptional(in);
keys = new double[in.readInt()];
for (int i = 0; i < keys.length; ++i) {
keys[i] = in.readDouble();
}
long minBarForHighestToLowestValueRatio = in.readLong();
ByteBuffer stateBuffer = ByteBuffer.wrap(in.readByteArray());
try {
state =
DoubleHistogram.decodeFromCompressedByteBuffer(
stateBuffer, minBarForHighestToLowestValueRatio);
} catch (DataFormatException e) {
throw new IOException("Failed to decode DoubleHistogram for aggregation [" + name + "]", e);
}
keyed = in.readBoolean();
}
public long getEstimatedMemoryFootprint() {
return state.getEstimatedFootprintInBytes();
}