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package eu.dnetlib.data.mapreduce.hbase.dedup.cc;
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import java.io.IOException;
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import java.nio.ByteBuffer;
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import eu.dnetlib.data.mapreduce.JobParams;
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import eu.dnetlib.data.mapreduce.util.DedupUtils;
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import eu.dnetlib.data.mapreduce.util.StreamUtils;
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import eu.dnetlib.data.proto.DedupProtos.Dedup;
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import eu.dnetlib.data.proto.OafProtos.Oaf;
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import eu.dnetlib.data.proto.OafProtos.OafRel;
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import eu.dnetlib.data.proto.TypeProtos.Type;
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import eu.dnetlib.pace.config.DedupConfig;
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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.client.Durability;
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import org.apache.hadoop.hbase.client.Put;
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import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
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import org.apache.hadoop.hbase.mapreduce.TableReducer;
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import org.apache.hadoop.hbase.util.Bytes;
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import org.apache.hadoop.io.Text;
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/**
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* Created by claudio on 15/10/15.
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*/
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public class ConnectedComponentsReducer extends TableReducer<Text, VertexWritable, ImmutableBytesWritable> {
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private static final Log log = LogFactory.getLog(ConnectedComponentsReducer.class);
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private DedupConfig dedupConf;
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private byte[] cfMergedIn;
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private byte[] cfMerges;
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@Override
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protected void setup(final Context context) {
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dedupConf = DedupConfig.load(context.getConfiguration().get(JobParams.DEDUP_CONF));
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log.info("dedup findRoots mapper\nwf conf: " + dedupConf.toString());
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final Type type = Type.valueOf(dedupConf.getWf().getEntityType());
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cfMergedIn = DedupUtils.getDedupCF_mergedInBytes(type);
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cfMerges = DedupUtils.getDedupCF_mergesBytes(type);
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}
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@Override
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protected void reduce(Text key, Iterable<VertexWritable> values, Context context) throws IOException, InterruptedException {
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final byte[] root = DedupUtils.newIdBytes(ByteBuffer.wrap(Bytes.toBytes(key.toString())), dedupConf.getWf().getDedupRun());
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StreamUtils.toStream(values.iterator())
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// .limit(1000) // might cause timeouts in case of large number of items
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.flatMap(v -> v.getEdges().stream())
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.forEach(q -> {
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final byte[] qb = Bytes.toBytes(q.toString());
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emitDedupRel(context, cfMergedIn, qb, root, buildRel(qb, root, Dedup.RelName.isMergedIn));
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emitDedupRel(context, cfMerges, root, qb, buildRel(root, qb, Dedup.RelName.merges));
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context.getCounter(dedupConf.getWf().getEntityType(), "dedupRel (x2)").increment(1);
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});
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}
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private void emitDedupRel(final Context context, final byte[] cf, final byte[] from, final byte[] to, final byte[] value) {
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final Put put = new Put(from).add(cf, to, value);
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put.setDurability(Durability.SKIP_WAL);
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try {
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context.write(new ImmutableBytesWritable(from), put);
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} catch (IOException | InterruptedException e) {
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throw new RuntimeException(e);
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}
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}
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private byte[] buildRel(final byte[] from, final byte[] to, final Dedup.RelName relClass) {
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final OafRel.Builder oafRef = DedupUtils.getDedup(dedupConf, new String(from), new String(to), relClass);
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final Oaf oaf = DedupUtils.buildRel(dedupConf, oafRef, 0.8).build();
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return oaf.toByteArray();
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}
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}
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