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package eu.dnetlib.data.mapreduce.hbase.dedup;
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import java.io.IOException;
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import java.nio.charset.Charset;
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import org.apache.commons.lang.StringUtils;
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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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import org.apache.hadoop.mapreduce.lib.output.MultipleOutputs;
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import com.google.common.base.Function;
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import com.google.common.base.Joiner;
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import com.google.common.collect.Iterables;
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import eu.dnetlib.data.mapreduce.JobParams;
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import eu.dnetlib.pace.config.DedupConfig;
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public class DedupRootsToCsvReducer extends Reducer<ImmutableBytesWritable, ImmutableBytesWritable, Text, Text> {
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/**
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* logger.
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*/
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private static final Log log = LogFactory.getLog(DedupRootsToCsvReducer.class); // NOPMD by marko on 11/24/08 5:02 PM
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private static final String COUNTER_GROUP = "csv";
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enum Tables {
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Groups, NativeGroups, NativeEntities
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}
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private DedupConfig dedupConf;
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private String DELIM;
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private String WRAP;
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private Text tKey;
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private Text tValue;
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private MultipleOutputs<Text, Text> mos;
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@Override
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protected void setup(final Context context) throws IOException, InterruptedException {
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super.setup(context);
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tKey = new Text();
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tValue = new Text();
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mos = new MultipleOutputs<Text, Text>(context);
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dedupConf = DedupConfig.load(context.getConfiguration().get(JobParams.DEDUP_CONF));
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log.info("wf conf: " + dedupConf.toString());
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DELIM = context.getConfiguration().get("mapred.textoutputformat.separator", "!");
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WRAP = context.getConfiguration().get("mapred.textoutputformat.wrapper", "#");
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log.info("using field DELIMITER: '" + DELIM + "'");
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}
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@Override
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protected void reduce(final ImmutableBytesWritable key, final Iterable<ImmutableBytesWritable> values, final Context context) throws IOException,
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InterruptedException {
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final String csv = Joiner.on(DELIM).join(Iterables.transform(values, new Function<ImmutableBytesWritable, String>() {
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@Override
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public String apply(final ImmutableBytesWritable ibw) {
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return new String(ibw.copyBytes(), Charset.forName("UTF-8"));
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}
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}));
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tKey.set(StringUtils.substringBefore(csv, DELIM));
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tValue.set(StringUtils.substringAfter(csv, DELIM));
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mos.write(Tables.Groups.toString(), tKey, tValue, Tables.Groups.toString());
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context.getCounter(COUNTER_GROUP, "groups").increment(StringUtils.countMatches(csv, DELIM));
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}
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@Override
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public void cleanup(final Context context) throws IOException, InterruptedException {
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mos.close();
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}
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}
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