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package eu.dnetlib.data.mapreduce.hbase.dataexport;
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import java.io.IOException;
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import java.util.Map;
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import java.util.Map.Entry;
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import java.util.NavigableMap;
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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.Result;
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import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
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import org.apache.hadoop.hbase.mapreduce.TableMapper;
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import org.apache.hadoop.io.Text;
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import com.google.common.base.Joiner;
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import com.googlecode.protobuf.format.JsonFormat;
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import eu.dnetlib.data.mapreduce.util.OafDecoder;
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/**
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* Exports Oaf objects as their json serialization.
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*
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* @author claudio
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*
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*/
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public class ExportInformationSpaceMapper extends TableMapper<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(ExportInformationSpaceMapper.class); // NOPMD by marko on 11/24/08 5:02 PM
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private static final String SEPARATOR = "@";
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private Text keyOut;
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private Text valueOut;
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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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keyOut = new Text();
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valueOut = new Text();
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}
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@Override
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protected void map(final ImmutableBytesWritable keyIn, final Result value, final Context context) throws IOException, InterruptedException {
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try {
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byte[] rowKey = keyIn.copyBytes();
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Map<byte[], NavigableMap<byte[], byte[]>> row = value.getNoVersionMap();
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for (byte[] cf : row.keySet()) {
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for (Entry<byte[], byte[]> q : row.get(cf).entrySet()) {
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emit(rowKey, cf, q.getKey(), q.getValue(), context);
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}
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}
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} catch (final Throwable e) {
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log.error("error exporting the following record from HBase: " + value.toString(), e);
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context.getCounter("error", e.getClass().getName()).increment(1);
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throw new RuntimeException(e);
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}
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}
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private void emit(final byte[] rowKey, final byte[] cf, final byte[] q, final byte[] value, final Context context) throws IOException, InterruptedException {
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keyOut.set(Joiner.on(SEPARATOR).join(new String(rowKey), new String(cf), new String(q)));
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if ((value == null) || (value.length == 0)) {
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valueOut.set("");
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} else {
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valueOut.set(new JsonFormat().printToString(OafDecoder.decode(value).getOaf()));
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}
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context.write(keyOut, valueOut);
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}
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}
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