我正在嘗試將Hbase原子增量列讀入Pig中,並以Long值的形式訪問它。Pig + Hbase原子增量列值
但是,列值使用Hbases六角狀結構:\ X00 \ X00 \ X00 \ X00 \ X00 \ X00 \ X00 \ X01
有誰知道的方法來轉換,在豬成爲equivilant到在get_counter值:1
我已經使用UDF發佈的解決方案:
import java.io.IOException;
import org.apache.pig.EvalFunc;
import org.apache.pig.backend.executionengine.ExecException;
import org.apache.pig.data.DataByteArray;
import org.apache.pig.data.DataType;
import org.apache.pig.data.Tuple;
import org.apache.pig.impl.logicalLayer.schema.Schema;
public class ConvertToLong extends EvalFunc<Long> {
@Override
public Long exec(Tuple input) throws IOException {
if (input == null || input.size() == 0) {
return null;
}
try {
long value = 0;
DataByteArray dba = (DataByteArray)input.get(0);
System.out.println(dba.toString());
byte[] ba = dba.get();
for (int i = 0; i < ba.length; i++)
{
value = (value << 8) + (ba[i] & 0xff);
}
return value;
//return value;
} catch (ExecException e) {
log.warn("Error reading input: " + e.getMessage());
return 3L;
} catch(Exception e){
log.warn("Error:" + e.getMessage());
return 2L;
}
}
@Override
public Schema outputSchema(Schema input) {
return new Schema(new Schema.FieldSchema(null, DataType.LONG));
}
}
即使沒有施法= HBaseBinaryConverter,你可以有使用簡單的代碼來解釋字節數組作爲長:返回Bytes.toLong(BA); – 2013-04-12 15:06:01