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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.util.Properties;
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import org.apache.hadoop.hbase.client.Scan;
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import org.apache.hadoop.hbase.filter.PrefixFilter;
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import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
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import org.apache.hadoop.hbase.mapreduce.TableMapReduceUtil;
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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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import org.apache.hadoop.mapreduce.Job;
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import eu.dnetlib.data.mapreduce.JobParams;
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import eu.dnetlib.data.mapreduce.hbase.AbstractHBaseMapReduceJob;
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import eu.dnetlib.data.proto.TypeProtos.Type;
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import eu.dnetlib.pace.util.DedupConfig;
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import eu.dnetlib.pace.util.DedupConfigLoader;
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public class DedupBuildRootsJob extends AbstractHBaseMapReduceJob {
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@Override
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public Job setJobDetails(final Job job, final Properties p) {
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initMapper(job, getScan(p), p.getProperty(JobParams.HBASE_SOURCE_TABLE));
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job.getConfiguration().setBoolean("mapred.reduce.tasks.speculative.execution", false);
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job.getConfiguration().setBoolean("mapred.map.tasks.speculative.execution", false);
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job.getConfiguration().setBoolean("mapreduce.map.speculative", false);
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job.getConfiguration().setBoolean("mapreduce.reduce.speculative", false);
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job.setNumReduceTasks(500);
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return job;
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}
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private Scan getScan(final Properties p) {
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Scan scan = new Scan();
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scan.setCaching(100); // 1 is the default in Scan, which will be bad for MapReduce jobs
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scan.setCacheBlocks(false); // don't set to true for MR jobs
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DedupConfig dedupConfig = DedupConfigLoader.load(p.getProperty("dedup.wf.conf"));
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scan.setFilter(new PrefixFilter(Bytes.toBytes(Type.valueOf(dedupConfig.getEntityType()).getNumber())));
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return scan;
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}
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private void initMapper(final Job job, final Scan scan, final String sourceTable) {
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try {
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TableMapReduceUtil.initTableMapperJob(sourceTable, scan, DedupBuildRootsMapper.class, Text.class, ImmutableBytesWritable.class, job);
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TableMapReduceUtil.initTableReducerJob(sourceTable, DedupBuildRootsReducer.class, job);
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} catch (IOException e) {
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throw new RuntimeException(e);
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}
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}
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}
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