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Hive如何自定義函數(shù)實現(xiàn)將自定義函數(shù)注冊到hive源碼中并重新編譯hive

發(fā)布時間:2021-12-10 14:19:36 來源:億速云 閱讀:140 作者:小新 欄目:大數(shù)據(jù)

這篇文章主要介紹Hive如何自定義函數(shù)實現(xiàn)將自定義函數(shù)注冊到hive源碼中并重新編譯hive,文中介紹的非常詳細,具有一定的參考價值,感興趣的小伙伴們一定要看完!

hive版本:
    hive-1.1.0-cdh6.7.0
1 編寫UDF函數(shù)
    1.1 用戶idea+maven創(chuàng)建項目,pom.xml文件的配置如下:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 <modelVersion>4.0.0</modelVersion>

 <groupId>com.ruozedata.bigdata</groupId>
 <artifactId>hive</artifactId>
 <version>1.0-SNAPSHOT</version>

 <name>hive</name>
 <!-- FIXME change it to the project's website -->
 <url>http://www.example.com</url>

 <properties>
   <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
   <maven.compiler.source>1.7</maven.compiler.source>
   <maven.compiler.target>1.7</maven.compiler.target>
   <hive.version>1.1.0-cdh6.7.0</hive.version>
   <hadoop.version>2.6.0-cdh6.7.0</hadoop.version>
 </properties>

 <!--Note: CDH版本一定需要添加如下依賴-->
 <repositories>
   <repository>
     <id>cloudera</id>
     <url>https://repository.cloudera.com/artifactory/cloudera-repos</url>
   </repository>
 </repositories>

 <dependencies>
   <!-- HDFS -->
   <dependency>
     <groupId>org.apache.hadoop</groupId>
     <artifactId>hadoop-common</artifactId>
     <version>${hadoop.version}</version>
   </dependency>

   <dependency>
     <!-- Hive -->
     <groupId>org.apache.hive</groupId>
     <artifactId>hive-exec</artifactId>
     <version>${hive.version}</version>
   </dependency>

   <dependency>
     <groupId>junit</groupId>
     <artifactId>junit</artifactId>
     <version>4.11</version>
     <scope>test</scope>
   </dependency>
 </dependencies>

 <build>
   <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
     <plugins>
<plugin>
 <artifactId>maven-clean-plugin</artifactId>
 <version>3.0.0</version>
</plugin>
<!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_jar_packaging -->
<plugin>
 <artifactId>maven-resources-plugin</artifactId>
 <version>3.0.2</version>
</plugin>
<plugin>
 <artifactId>maven-compiler-plugin</artifactId>
 <version>3.7.0</version>
</plugin>
<plugin>
 <artifactId>maven-surefire-plugin</artifactId>
 <version>2.20.1</version>
</plugin>
<plugin>
 <artifactId>maven-jar-plugin</artifactId>
 <version>3.0.2</version>
</plugin>
<plugin>
 <artifactId>maven-install-plugin</artifactId>
 <version>2.5.2</version>
</plugin>
<plugin>
 <artifactId>maven-deploy-plugin</artifactId>
 <version>2.8.2</version>
</plugin>
     </plugins>
   </pluginManagement>
 </build>
</project>


    1.2 下載相關(guān)包:右鍵maven項目,maven->Reimport,就可自動下載jar包了,網(wǎng)絡(luò)不好的話有點慢,

    1.3 創(chuàng)建類,右鍵包名:New->java Class 新建HelloUDF.java類
    package com.ruozedata.bigdata;
    import org.apache.hadoop.hive.ql.exec.Description;
    import org.apache.hadoop.hive.ql.exec.UDF;

    @Description(
    name="sayhelloudf",
    value="_FUNC_(input_str) - returns Hello : input_str  or _FUNC_(input_str,input_str2) - returns Hello : input_str:input_str2 ",
    extended = "Example:\n"+
                    " > SELECT _FUNC_('xx') FROM dual LIMIT 1;\n" +
                    "   Hello : xx "
                    )
    public class HelloUDF extends UDF {

        public String evaluate(String input){
                return "Hello:" + input;
       }

       public String evaluate(String input, String input2){
                return "Hello:" + input + " : " + input2;
       }
    }

2 下載hive-1.1.0-cdh6.7.0-src.tar.gz源碼文件
     http://archive.cloudera.com/cdh6/cdh/5/hive-1.1.0-cdh6.7.0-src.tar.gz
    [hadoop@hadoop002 software]$ pwd
    /home/hadoop/software
    [hadoop@hadoop002 software]$ ll
    total 499272
    drwxrwxr-x. 17 hadoop hadoop      4096 Mar 24  2016 hadoop-2.6.0-cdh6.7.0
    -rw-rw-r--.  1 hadoop hadoop  42610549 Jul  5 15:05 hadoop-2.6.0-cdh6.7.0-src.tar.gz
    -rw-rw-r--.  1 hadoop hadoop 311585484 Feb 20 07:16 hadoop-2.6.0-cdh6.7.0.tar.gz
    -rw-rw-r--.  1 hadoop hadoop  14652104 Feb 21 05:28 hive-1.1.0-cdh6.7.0-src.tar.gz
    -rw-rw-r--.  1 hadoop hadoop 116082695 Feb 21 05:28 hive-1.1.0-cdh6.7.0.tar.gz
    -rw-rw-r--.  1 hadoop hadoop  29966286 Feb 22 02:28 sqoop-1.4.6-cdh6.7.0.tar.gz

    解壓到當(dāng)前目錄:
    [hadoop@hadoop002 software]$ tar -zxvf hive-1.1.0-cdh6.7.0-src.tar.gz
    [hadoop@hadoop002 software]$ ll
    total 503368
    drwxrwxr-x. 17 hadoop hadoop      4096 Mar 24  2016 hadoop-2.6.0-cdh6.7.0
    -rw-rw-r--.  1 hadoop hadoop  42610549 Jul  5 15:05 hadoop-2.6.0-cdh6.7.0-src.tar.gz
    -rw-rw-r--.  1 hadoop hadoop 311585484 Feb 20 07:16 hadoop-2.6.0-cdh6.7.0.tar.gz
    drwxrwxr-x. 32 hadoop hadoop      4096 Jul  5 15:15 hive-1.1.0-cdh6.7.0
    -rw-rw-r--.  1 hadoop hadoop  14652104 Feb 21 05:28 hive-1.1.0-cdh6.7.0-src.tar.gz
    -rw-rw-r--.  1 hadoop hadoop 116082695 Feb 21 05:28 hive-1.1.0-cdh6.7.0.tar.gz
    -rw-rw-r--.  1 hadoop hadoop  29966286 Feb 22 02:28 sqoop-1.4.6-cdh6.7.0.tar.gz


3 將HelloUDF.java類添加到源碼
    3.1 將HelloUDF.java類上傳到/home/hadoop/software/hive-1.1.0-cdh6.7.0/ql/src/java/org/apache/hadoop/hive/ql/udf 目錄。
    3.2 修改HelloUDF.java類的包:將 package com.ruozedata.bigdata; 修改為package org.apache.hadoop.hive.ql.udf;
    3.3 修改FunctionRegistry.java類文件,對HelloUDF.java類進行注冊:
        3.3.1 引入HelloUDF.java類文件的路徑:
                    import org.apache.hadoop.hive.ql.udf.HelloUDF;
 
        3.3.2 在 static 塊中添加:system.registerUDF("helloudf", HelloUDF.class, false);
                如下:
                        static {
                                   system.registerGenericUDF("concat", GenericUDFConcat.class);
                                   system.registerUDF("helloudf", HelloUDF.class, false);
                                   .
                                   .
                                   .
                               }


4 編譯 hive-1.1.0-cdh6.7.0
    4.1 進入hive-1.1.0-cdh6.7.0目錄進行源碼編譯:
    [hadoop@hadoop002 software]$ cd hive-1.1.0-cdh6.7.0
    [hadoop@hadoop002 hive-1.1.0-cdh6.7.0]$ mvn clean package -DskipTests -Phadoop-2 -Pdist

    出現(xiàn)如下日志,表示編譯成功
    [INFO] --- build-helper-maven-plugin:1.8:attach-artifact (attach-jdbc-driver) @ hive-packaging ---
    [INFO] ------------------------------------------------------------------------
    [INFO] Reactor Summary:
    [INFO] 
    [INFO] Hive ............................................... SUCCESS [  9.558 s]
    [INFO] Hive Shims Common .................................. SUCCESS [ 14.763 s]
    [INFO] Hive Shims 0.23 .................................... SUCCESS [  7.488 s]
    [INFO] Hive Shims Scheduler ............................... SUCCESS [  4.449 s]
    [INFO] Hive Shims ......................................... SUCCESS [  2.784 s]
    [INFO] Hive Common ........................................ SUCCESS [ 14.109 s]
    [INFO] Hive Serde ......................................... SUCCESS [ 12.877 s]
    [INFO] Hive Metastore ..................................... SUCCESS [ 39.906 s]
    [INFO] Hive Ant Utilities ................................. SUCCESS [  3.377 s]
    [INFO] Spark Remote Client ................................ SUCCESS [ 13.578 s]
    [INFO] Hive Query Language ................................ SUCCESS [02:22 min]
    [INFO] Hive Service ....................................... SUCCESS [01:14 min]
    [INFO] Hive Accumulo Handler .............................. SUCCESS [ 36.593 s]
    [INFO] Hive JDBC .......................................... SUCCESS [01:31 min]
    [INFO] Hive Beeline ....................................... SUCCESS [  8.103 s]
    [INFO] Hive CLI ........................................... SUCCESS [  8.419 s]
    [INFO] Hive Contrib ....................................... SUCCESS [  7.041 s]
    [INFO] Hive HBase Handler ................................. SUCCESS [01:29 min]
    [INFO] Hive HCatalog ...................................... SUCCESS [ 31.376 s]
    [INFO] Hive HCatalog Core ................................. SUCCESS [ 13.366 s]
    [INFO] Hive HCatalog Pig Adapter .......................... SUCCESS [ 10.937 s]
    [INFO] Hive HCatalog Server Extensions .................... SUCCESS [ 32.887 s]
    [INFO] Hive HCatalog Webhcat Java Client .................. SUCCESS [  6.679 s]
    [INFO] Hive HCatalog Webhcat .............................. SUCCESS [ 41.266 s]
    [INFO] Hive HCatalog Streaming ............................ SUCCESS [  6.445 s]
    [INFO] Hive HWI ........................................... SUCCESS [  5.169 s]
    [INFO] Hive ODBC .......................................... SUCCESS [  3.305 s]
    [INFO] Hive Shims Aggregator .............................. SUCCESS [  1.139 s]
    [INFO] Hive TestUtils ..................................... SUCCESS [  1.869 s]
    [INFO] Hive Packaging ..................................... SUCCESS [01:19 min]
    [INFO] ------------------------------------------------------------------------
    [INFO] BUILD SUCCESS
    [INFO] ------------------------------------------------------------------------
    [INFO] Total time: 13:37 min
    [INFO] Finished at: 2018-07-05T16:02:01+08:00
    [INFO] Final Memory: 158M/494M
    [INFO] ------------------------------------------------------------------------

    4.2  編譯成功后會生成一個tar包:/home/hadoop/software/hive-1.1.0-cdh6.7.0/packaging/target/apache-hive-1.1.0-cdh6.7.0-bin.tar.gz  
       
5  部署hive-1.1.0-cdh6.7.0
    5.1 直接將編譯好的apache-hive-1.1.0-cdh6.7.0-bin.tar.gz進行安裝,見我前面寫的一篇博客:hive-1.1.0-cdh6.7.0 安裝 http://blog.itpub.net/29609890/viewspace-2155488/
    5.2 替換hive-exec-1.1.0-cdh6.7.0.jar包。 在編譯好的文件中找到hive-exec-1.1.0-cdh6.7.0.jar包,去替換現(xiàn)在使用的hadoop-2.6.0-cdh6.7.0的hive-exec-1.1.0-cdh6.7.0.jar包
       編譯好的hive-exec-1.1.0-cdh6.7.0.jar包路徑:/home/hadoop/software/hive-1.1.0-cdh6.7.0/packaging/target/apache-hive-1.1.0-cdh6.7.0-bin/apache-hive-1.1.0-cdh6.7.0-bin/lib/
       現(xiàn)在使用的hadoop-2.6.0-cdh6.7.0的hive-exec-1.1.0-cdh6.7.0.jar包路徑:/home/hadoop/app/hive-1.1.0-cdh6.7.0/lib/hive-exec-1.1.0-cdh6.7.0.jar
        切換到現(xiàn)在使用的hive目錄:
        [hadoop@hadoop002 ~]$ cd ~/app/hive-1.1.0-cdh6.7.0/
        [hadoop@hadoop002 hive-1.1.0-cdh6.7.0]$ pwd
        /home/hadoop/app/hive-1.1.0-cdh6.7.0
        [hadoop@hadoop002 hive-1.1.0-cdh6.7.0]$ 
        備份現(xiàn)在使用的jar包:
        /home/hadoop/app/hive-1.1.0-cdh6.7.0/lib/
         [hadoop@hadoop002 hive-1.1.0-cdh6.7.0]# mv hive-exec-1.1.0-cdh6.7.0.jar hive-exec-1.1.0-cdh6.7.0.jar.bak
        拷貝到原h(huán)ive 部署位置:
        [hadoop@hadoop002 hive-1.1.0-cdh6.7.0]# cp /home/hadoop/software/hive-1.1.0-cdh6.7.0/packaging/target/apache-hive-1.1.0-cdh6.7.0-bin/apache-hive-1.1.0-cdh6.7.0-bin/lib/hive-exec-1.1.0-cdh6.7.0.jar  ./
        查看hive-exec-1.1.0-cdh6.7.0.jar包
        [hadoop@hadoop002 lib]$ ll hive-exec-1.1.0-cdh6.7.0.*
        -rw-rw-r--. 1 hadoop hadoop 19274963 Jul  5 17:44 hive-exec-1.1.0-cdh6.7.0.jar
        -rw-r--r--. 1 hadoop hadoop 19272159 Mar 24  2016 hive-exec-1.1.0-cdh6.7.0.jar.bak


6 重啟hive進行驗證:
     hive> desc function sayhelloudf;
    OK
    sayhelloudf(input_str) - returns Hello : input_str  or sayhelloudf(input_str,input_str2) - returns Hello : input_str:input_str2 
    Time taken: 0.031 seconds, Fetched: 1 row(s)
    hive> select sayhelloudf('zhangsan') from ruozedata.dual;
    OK
    Hello:zhangsan
    Time taken: 2.531 seconds, Fetched: 1 row(s)
    hive> select sayhelloudf('zhangsan','lisi') from ruozedata.dual;
    OK
    Hello:zhangsan : lisi
    Time taken: 0.397 seconds, Fetched: 1 row(s)
    hive> 

以上是“Hive如何自定義函數(shù)實現(xiàn)將自定義函數(shù)注冊到hive源碼中并重新編譯hive”這篇文章的所有內(nèi)容,感謝各位的閱讀!希望分享的內(nèi)容對大家有幫助,更多相關(guān)知識,歡迎關(guān)注億速云行業(yè)資訊頻道!

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