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搭配 Apache Flink® DataStream API 使用 Hive 中繼存放區

重要

此功能目前為預覽功能。 適用於 Microsoft Azure 預覽版的補充使用規定包含適用於 Beta 版、預覽版或尚未發行至正式運作之 Azure 功能的更合法條款。 如需此特定預覽的相關信息,請參閱 AKS 預覽資訊的 Azure HDInsight。 如需問題或功能建議,請在 AskHDInsight提交要求,並提供詳細數據,並遵循我們在 Azure HDInsight 社群取得更多更新。

多年來,Hive 中繼存放區已演變成 Hadoop 生態系統中事實上的元數據中心。 許多公司在其生產環境中都有個別的Hive中繼存放區服務實例,以管理其所有元數據(Hive或非Hive元數據)。 對於同時部署Hive和 Flink 的使用者,HiveCatalog 可讓他們使用Hive中繼存放區來管理 Flink 的元數據。

支援的 Hive 版本:

  • 3.1
    • 3.1.0
    • 3.1.1
    • 3.1.2
    • 3.1.3

如果您要建置自己的程式,則需要mvn檔案中的下列相依性。 不建議將這些相依性包含在產生的 jar 檔案中。 您應該在運行時間新增相依性。

<!-- https://mvnrepository.com/artifact/org.apache.flink/flink-table-api-java-bridge -->
        <dependency>
            <groupId>org.apache.flink</groupId>
            <artifactId>flink-table-api-java-bridge</artifactId>
            <version>${flink.version}</version>
            <scope>provided</scope>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.flink/flink-connector-hive -->
        <dependency>
            <groupId>org.apache.flink</groupId>
            <artifactId>flink-connector-hive_2.12</artifactId>
            <version>${flink.version}</version>
            <scope>provided</scope>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.flink/flink-table-planner -->
        <dependency>
            <groupId>org.apache.flink</groupId>
            <artifactId>flink-table-planner_2.12</artifactId>
            <version>${flink.version}</version>
            <scope>provided</scope>
</dependency>

連線 至Hive

此範例說明在 AKS 上使用 HDInsight 上的 Apache Flink 連線到 Hive 的各種代碼段,您必須使用 作為 Hive 組態目錄來與 /opt/hive-conf Hive 中繼存放區連線

package contoso.example;

import org.apache.flink.streaming.api.TimeCharacteristic;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.table.api.bridge.java.StreamTableEnvironment;
import org.apache.flink.table.catalog.hive.HiveCatalog;

public class hiveDemo {
    public static void main(String[] args) throws Exception {
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
        // start Table Environment
        StreamTableEnvironment tableEnv =
                StreamTableEnvironment.create(env);
        env.setStreamTimeCharacteristic(TimeCharacteristic.EventTime);
        String catalogName = "myhive";
        String defaultDatabase = HiveCatalog.DEFAULT_DB;
        String hiveConfDir = "/opt/hive-conf";
        HiveCatalog hive = new HiveCatalog(catalogName, defaultDatabase, hiveConfDir);
        // register HiveCatalog in the tableEnv
        tableEnv.registerCatalog("myhive", hive);
        // set the HiveCatalog as the current catalog of the session
        tableEnv.useCatalog("myhive");
        // Create a table in hive catalog
        tableEnv.executeSql("create table MyTable (name varchar(32), age int) with ('connector' = 'filesystem', 'path' = 'abfs://flink@contosogen2.dfs.core.windows.net/data/', 'format' = 'csv','csv.field-delimiter' = ',')");
        // Create a view in hive catalog
        tableEnv.executeSql("create view MyView as select * from MyTable");

        // Read from the table and print the results
        tableEnv.from("MyTable").execute().print();
        // 4. run stream
        env.execute("Hive Demo on Flink");
    }
}

在 Webssh Pod 上,移動規劃工具 jar

移動位於 webssh Pod 的 jar,並從 中移除 jar flink-table-planner-loader-1.17.0-*.*.*.jarlibflink-table-planner-loader-1.17.0-*.*.*.jar/opt to /lib 如需詳細資訊,請參閱問題。 執行下列步驟來移動規劃工具 jar。

mv /opt/flink-webssh/lib/flink-table-planner-loader-1.17.0-1.1.8.jar /opt/flink-webssh/opt/
mv /opt/flink-webssh/opt/flink-table-planner_2.12-1.17.0-1.1.8.jar /opt/flink-webssh/lib/

注意

只有在使用Hive方言或HiveServer2端點時,才需要額外的規劃工具 jar 移動。 不過,這是Hive整合的建議設定。

如需詳細資訊,請參閱 如何在 AKS 上搭配 HDInsight 上的 Apache Flink® 使用 Hive 目錄

封裝 jar 並將它上傳至 Webssh 並執行

user@sshnode-0 [ ~ ]$ bin/flink run -c contoso.example.hiveDemo -j FlinkSQLServerCDCDemo-1.0-SNAPSHOT.jar 
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/opt/flink-webssh/lib/log4j-slf4j-impl-2.17.1.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/opt/hadoop/flink-hadoop-dep-1.17.0-1.1.8.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.apache.logging.slf4j.Log4jLoggerFactory]
Job has been submitted with JobID 5c887e1f8e1bfac501168c439a83788f
+----+--------------------------------+-------------+
| op |                           name |         age |
+----+--------------------------------+-------------+
| +I |                           Jack |          18 |
| +I |                           mike |          24 |
+----+--------------------------------+-------------+
2 rows in set

顯示如何檢查作業狀態的螢幕快照。

透過檢查 Webssh UI 上的資料表 sql-client.sh

user@sshnode-0 [ ~ ]$ bin/sql-client.sh 
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/opt/flink-webssh/lib/log4j-slf4j-impl-2.17.1.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/opt/hadoop/flink-hadoop-dep-1.17.0-1.1.8.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.apache.logging.slf4j.Log4jLoggerFactory]

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    ______ _ _       _       _____  ____  _         _____ _ _            _  BETA   
   |  ____| (_)     | |     / ____|/ __ \| |       / ____| (_)          | |  
   | |__  | |_ _ __ | | __ | (___ | |  | | |      | |    | |_  ___ _ __ | |_ 
   |  __| | | | '_ \| |/ /  \___ \| |  | | |      | |    | | |/ _ \ '_ \| __|
   | |    | | | | | |   <   ____) | |__| | |____  | |____| | |  __/ | | | |_ 
   |_|    |_|_|_| |_|_|\_\ |_____/ \___\_\______|  \_____|_|_|\___|_| |_|\__|
          
        Welcome! Enter 'HELP;' to list all available commands. 'QUIT;' to exit.

Command history file path: /home/xcao/.flink-sql-history


Flink SQL> CREATE CATALOG myhive WITH (
>     'type' = 'hive'
> );
[INFO] Execute statement succeed.

Flink SQL> USE CATALOG myhive;
[INFO] Execute statement succeed.

Flink SQL> show tables
> ;
+------------+
| table name |
+------------+
|    mytable |
|     myview |
+------------+
2 rows in set

Flink SQL> SET 'sql-client.execution.result-mode' = 'tableau';
[INFO] Execute statement succeed.

Flink SQL> select * from mytable;
+----+--------------------------------+-------------+
| op |                           name |         age |
+----+--------------------------------+-------------+
| +I |                           Jack |          18 |
| +I |                           mike |          24 |
+----+--------------------------------+-------------+
Received a total of 2 rows

參考資料