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package eu.dnetlib.data.mapreduce.hbase.dli;
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import java.io.IOException;
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import java.util.Arrays;
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import java.util.Iterator;
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import java.util.LinkedList;
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import java.util.concurrent.atomic.AtomicInteger;
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import com.google.common.base.Splitter;
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import com.google.common.collect.Lists;
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import com.google.protobuf.InvalidProtocolBufferException;
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import com.googlecode.protobuf.format.JsonFormat;
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import eu.dnetlib.data.mapreduce.hbase.dli.kv.DliKey;
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import eu.dnetlib.data.proto.dli.ScholixObjectProtos.Scholix;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
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import org.apache.hadoop.io.Text;
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import org.apache.hadoop.mapreduce.Reducer;
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/**
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* Created by claudio on 13/03/2017.
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*/
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public class PrepareScholixDataReducer extends Reducer<DliKey, ImmutableBytesWritable, Text, Text> {
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private static final Log log = LogFactory.getLog(PrepareScholixDataReducer.class); // NOPMD by marko on 11/24/08 5:02 PM
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private Text outKey;
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private Text outValue;
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@Override
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protected void setup(final Context context) throws IOException, InterruptedException {
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outKey = new Text("");
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outValue = new Text();
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}
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@Override
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protected void reduce(DliKey key, Iterable<ImmutableBytesWritable> values, Context context) throws IOException, InterruptedException {
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//System.out.println("reducing key = " + key);
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final Iterator<ImmutableBytesWritable> it = values.iterator();
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final ImmutableBytesWritable first = it.next();
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final Scholix source = parse(key, first).build();
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final AtomicInteger groupSize = new AtomicInteger(1);
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if (!source.hasSource()) {
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context.getCounter("scholix", "missing source").increment(1);
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return;
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}
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it.forEachRemaining(t -> {
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groupSize.incrementAndGet();
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final Scholix.Builder rel = parse(key, t);
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if (rel.hasTarget()) {
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rel.setSource(source.getSource());
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emit(context, JsonFormat.printToString(rel.build()));
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} else {
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context.getCounter("scholix", "missing target").increment(1);
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}
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});
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groupSizeCounter(context, groupSize.get(),
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"1,1",
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"1,10",
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"10,20",
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"20,100",
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"100,200",
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"200,500",
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"500,1000",
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"1000,2000",
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"2000,5000",
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"5000,10000",
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"10000,20000",
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"20000,*");
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}
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private void groupSizeCounter(final Context context, final int groupSize, final String... groups) {
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Arrays.asList(groups).forEach(g -> {
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final LinkedList<String> i = Lists.newLinkedList(Splitter.on(",").split(g));
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int min = Integer.parseInt(i.getFirst());
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int max = i.getLast().equals("*") ? Integer.MAX_VALUE : Integer.parseInt(i.getLast());
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groupSizeCounter(context, groupSize, min, max);
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});
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}
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private void groupSizeCounter(final Context context, final int groupSize, Integer min, Integer max) {
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if (groupSize > min & groupSize <= max) {
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context.getCounter("scholix groups", String.format("group size (%s,%s)", min, max)).increment(1);
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}
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}
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private Scholix.Builder parse(DliKey key, final ImmutableBytesWritable value) {
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try {
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return Scholix.newBuilder(Scholix.parseFrom(value.copyBytes()));
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} catch (InvalidProtocolBufferException e) {
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throw new IllegalArgumentException(String.format("cannot parse Scholix, keytype '%s', id '%s'", key.getKeyType(), key.getId()));
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}
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}
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private void emit(final Context context, final String data) {
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outValue.set(data.getBytes());
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try {
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context.write(outKey, outValue);
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} catch (Exception e) {
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e.printStackTrace();
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throw new RuntimeException(e);
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}
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}
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}
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