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package parallelai.spyglass.hbase;
import java.io.IOException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
import org.apache.hadoop.mapred.FileAlreadyExistsException;
import org.apache.hadoop.mapred.InvalidJobConfException;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.FileOutputFormat;
import org.apache.hadoop.mapred.RecordWriter;
import org.apache.hadoop.mapred.Reporter;
import org.apache.hadoop.util.Progressable;
/**
* Convert Map/Reduce output and write it to an HBase table
*/
public class HBaseOutputFormat extends
FileOutputFormat<ImmutableBytesWritable, Put> {
/** JobConf parameter that specifies the output table */
public static final String OUTPUT_TABLE = "hbase.mapred.outputtable";
private final Log LOG = LogFactory.getLog(HBaseOutputFormat.class);
@Override
@SuppressWarnings("unchecked")
public RecordWriter getRecordWriter(FileSystem ignored,
JobConf job, String name, Progressable progress) throws IOException {
// expecting exactly one path
String tableName = job.get(OUTPUT_TABLE);
HTable table = null;
try {
table = new HTable(HBaseConfiguration.create(job), tableName);
} catch(IOException e) {
LOG.error(e);
throw e;
}
table.setAutoFlush(false);
return new HBaseRecordWriter(table);
}
@Override
public void checkOutputSpecs(FileSystem ignored, JobConf job)
throws FileAlreadyExistsException, InvalidJobConfException, IOException {
String tableName = job.get(OUTPUT_TABLE);
if(tableName == null) {
throw new IOException("Must specify table name");
}
}
}
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