hive udf 批量写入redis代码,Java代码库,德仔网

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【Java】 hive udf 批量写入redis
作者: / 发布于2017/9/19/ 215
import org.apache.hadoop.hive.ql.exec.Description;
import org.apache.hadoop.hive.ql.exec.UDFArgumentException;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.ql.udf.generic.GenericUDF;
import org.apache.hadoop.hive.serde2.objectinspector.*;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector.Category;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorFactory;
import org.apache.hadoop.io.IntWritable;
import redis.clients.jedis.HostAndPort;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.Pipeline;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

@Description(name = "redis_batch_hset",
        value = "_FUNC_(host_and_port,keyField, array<map>) - Return ret "
)
public class RedisBatchHSetUDF extends GenericUDF {

    private HostAndPort hostAndPort;
    private String keyField;
    private Object writableKeyField; //实际上是org.apache.hadoop.io.Text类型
    private StandardListObjectInspector paramsListInspector;
    private StandardMapObjectInspector paramsElementInspector;

    @Override
    public Object evaluate(DeferredObject[] arg0) throws HiveException {

        try (Jedis jedis = new Jedis(hostAndPort.getHost(), hostAndPort.getPort(), 10000, 60000);
             Pipeline pipeline = jedis.pipelined()
        ) {
            for (int i = 0; i < paramsListInspector.getListLength(arg0[2].get()); i++) {
                Object row = paramsListInspector.getListElement(arg0[2].get(), i);
                Map<?, ?> map = paramsElementInspector.getMap(row);
//                Object obj = ObjectInspectorUtils.copyToStandardJavaObject(row,paramsElementInspector); //转成标准的java map，否则里面的key value字段为hadoop writable对象
                if (map.containsKey(writableKeyField)) {
                    String did = map.get(writableKeyField).toString();
                    Map<String, String> data = new HashMap<>();
                    for (Map.Entry<?, ?> entry : map.entrySet()) {
                        if (!writableKeyField.equals(entry.getKey()) && entry.getValue() != null && !"".equals(entry.getValue().toString())) {
                            data.put(entry.getKey().toString(), entry.getValue().toString());
                        }
                    }
                    pipeline.hmset(did,data);
                }
            }
            pipeline.sync();
            return new IntWritable(1);
        } catch (IOException e) {
            e.printStackTrace();
            throw new HiveException(e);
        }

    }


    @Override
    public String getDisplayString(String[] arg0) {
        return "redis_batch_hset(redishost_and_port,keyField, array<map<string,string>>)";
    }


    @Override
    public ObjectInspector initialize(ObjectInspector[] arg0)
            throws UDFArgumentException {
        if (arg0.length != 3) {
            throw new UDFArgumentException(" Expecting   two  arguments:<redishost:port>  <keyField> array<map<string,string>> ");
        }
        //第一个参数校验
        if (arg0[0].getCategory() == Category.PRIMITIVE
                && ((PrimitiveObjectInspector) arg0[0]).getPrimitiveCategory() == PrimitiveObjectInspector.PrimitiveCategory.STRING) {
            if (!(arg0[0] instanceof ConstantObjectInspector)) {
                throw new UDFArgumentException("redis host:port  must be constant");
            }
            ConstantObjectInspector redishost_and_port = (ConstantObjectInspector) arg0[0];

            String[] host_and_port = redishost_and_port.getWritableConstantValue().toString().split(":");
            hostAndPort = new HostAndPort(host_and_port[0], Integer.parseInt(host_and_port[1]));
        }

        //第2个参数校验
        if (arg0[1].getCategory() == Category.PRIMITIVE
                && ((PrimitiveObjectInspector) arg0[1]).getPrimitiveCategory() == PrimitiveObjectInspector.PrimitiveCategory.STRING) {
            if (!(arg0[1] instanceof ConstantObjectInspector)) {
                throw new UDFArgumentException("redis hset key   must be constant");
            }
            ConstantObjectInspector keyFieldOI = (ConstantObjectInspector) arg0[1];

            keyField = keyFieldOI.getWritableConstantValue().toString();
            writableKeyField = keyFieldOI.getWritableConstantValue();
        }

        //第3个参数校验
        if (arg0[2].getCategory() != Category.LIST) {
            throw new UDFArgumentException(" Expecting an array<map<string,string>> field as third argument ");
        }
        ListObjectInspector third = (ListObjectInspector) arg0[2];
        if (third.getListElementObjectInspector().getCategory() != Category.MAP) {
            throw new UDFArgumentException(" Expecting an array<map<string,string>> field as third argument ");
        }
        paramsListInspector = ObjectInspectorFactory.getStandardListObjectInspector(third.getListElementObjectInspector());
        paramsElementInspector = (StandardMapObjectInspector) third.getListElementObjectInspector();
        System.out.println(paramsElementInspector.getMapKeyObjectInspector().getCategory());
        System.out.println(paramsElementInspector.getMapValueObjectInspector().getCategory());

        return PrimitiveObjectInspectorFactory.writableIntObjectInspector;
    }

}
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