HTableFactory.java

package ch.unibe.scg.cells.hadoop;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

import javax.inject.Inject;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.client.HTable;

/** Make a new HTable object (not the underlying database) for a given name. */
class HTableFactory implements Serializable {
	final private static long serialVersionUID = 1L;

	private transient Configuration hbaseConfig;

	@Inject
	HTableFactory(Configuration hbaseConfig) {
		this.hbaseConfig = hbaseConfig;
	}

	private void writeObject(ObjectOutputStream out) throws IOException {
		out.defaultWriteObject();
		hbaseConfig.write(out);
	}

	private void readObject(ObjectInputStream in) throws ClassNotFoundException, IOException {
		in.defaultReadObject();
		hbaseConfig = new Configuration();
		hbaseConfig.readFields(in);
	}

	HTable make(String tableName) {
		try {
			HTable htable = new HTable(hbaseConfig, tableName);
			htable.setAutoFlush(false);
			htable.setWriteBufferSize(1024 * 1024 * 12);
			htable.getTableDescriptor().setDeferredLogFlush(true);
			return htable;
		} catch (IOException e) {
			throw new RuntimeException("Couldn't make table " + tableName, e);
		}
	}
}