包含org.apache.hive.jdbc.hivedriver的词条

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本文目录一览:

如何在Java中执行Hive命令或HiveQL

Java在1.5过后提供了ProcessBuilder根据运行时环境启动一扒明个Process调用执行运行时环境下的命令或应用程序(1.5以前使用Runtime),关于ProcessBuilder请参考Java相关文档。调用代码如下:

String sql="show tables; select * from test_tb limit 10";

ListString command = new ArrayListString();

command.add("hive");

command.add("-e");

command.add(sql);

ListString results = new ArrayList世迅String();

ProcessBuilder hiveProcessBuilder = new ProcessBuilder(command);

hiveProcess = hiveProcessBuilder.start();

BufferedReader br = new BufferedReader(new InputStreamReader(

hiveProcess.getInputStream()));

String data = null;

while ((data = br.readLine()) != null) {

results.add(data);

}

其中command可以是其它Hive命令,搜此此不一定是HiveQL。

如何使用kettle连接hive和hive2

连接hive的方法:

进入hive所在的服务器链告,输入:hive --service hiveserver(目的:启动thrift)

打开kettle配置连接界面,输入hive所在服务器的ip、所需要的hive库、端口号悄唤橡(thrift默认端启旁口为:10000)

测试连接,即可

连接hive2的方法:

Error connecting to database [Hive] : org.pentaho.di.core.exception.KettleDatabaseException:

Error occured while trying to connect to the database

Error connecting to database: (using class org.apache.hadoop.hive.jdbc.HiveDriver)

Unable to load Hive Server 2 JDBC driver for the currently active Hadoop configuration

org.pentaho.di.core.exception.KettleDatabaseException:

Error occured while trying to connect to the database

Error connecting to database: (using class org.apache.hadoop.hive.jdbc.HiveDriver)

Unable to load Hive Server 2 JDBC driver for the currently active Hadoop configuration

at org.pentaho.di.core.database.Database.normalConnect(Database.java:428)

at org.pentaho.di.core.database.Database.connect(Database.java:361)

at org.pentaho.di.core.database.Database.connect(Database.java:314)

at org.pentaho.di.core.database.Database.connect(Database.java:302)

at org.pentaho.di.core.database.DatabaseFactory.getConnectionTestReport(DatabaseFactory.java:80)

at org.pentaho.di.core.database.DatabaseMeta.testConnection(DatabaseMeta.java:2685)

at org.pentaho.di.ui.core.database.dialog.DatabaseDialog.test(DatabaseDialog.java:109)

at org.pentaho.di.ui.core.database.wizard.CreateDatabaseWizardPage2.test(CreateDatabaseWizardPage2.java:157)

at org.pentaho.di.ui.core.database.wizard.CreateDatabaseWizardPage2$3.widgetSelected(CreateDatabaseWizardPage2.java:147)

at org.eclipse.swt.widgets.TypedListener.handleEvent(Unknown Source)

at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source)

at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)

at org.eclipse.swt.widgets.Display.runDeferredEvents(Unknown Source)

at org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source)

at org.eclipse.jface.window.Window.runEventLoop(Window.java:820)

at org.eclipse.jface.window.Window.open(Window.java:796)

at org.pentaho.di.ui.core.database.wizard.CreateDatabaseWizard.createAndRunDatabaseWizard(CreateDatabaseWizard.java:111)

at org.pentaho.di.ui.spoon.Spoon.createDatabaseWizard(Spoon.java:7457)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at org.pentaho.ui.xul.impl.AbstractXulDomContainer.invoke(AbstractXulDomContainer.java:313)

at org.pentaho.ui.xul.impl.AbstractXulComponent.invoke(AbstractXulComponent.java:157)

at org.pentaho.ui.xul.impl.AbstractXulComponent.invoke(AbstractXulComponent.java:141)

at org.pentaho.ui.xul.jface.tags.JfaceMenuitem.access$100(JfaceMenuitem.java:43)

at org.pentaho.ui.xul.jface.tags.JfaceMenuitem$1.run(JfaceMenuitem.java:106)

at org.eclipse.jface.action.Action.runWithEvent(Action.java:498)

at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:545)

at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:490)

at org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:402)

at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source)

at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)

at org.eclipse.swt.widgets.Display.runDeferredEvents(Unknown Source)

at org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source)

at org.pentaho.di.ui.spoon.Spoon.readAndDispatch(Spoon.java:1297)

at org.pentaho.di.ui.spoon.Spoon.waitForDispose(Spoon.java:7801)

at org.pentaho.di.ui.spoon.Spoon.start(Spoon.java:9130)

at org.pentaho.di.ui.spoon.Spoon.main(Spoon.java:638)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at org.pentaho.commons.launcher.Launcher.main(Launcher.java:151)

Caused by: org.pentaho.di.core.exception.KettleDatabaseException:

Error connecting to database: (using class org.apache.hadoop.hive.jdbc.HiveDriver)

Unable to load Hive Server 2 JDBC driver for the currently active Hadoop configuration

at org.pentaho.di.core.database.Database.connectUsingClass(Database.java:573)

at org.pentaho.di.core.database.Database.normalConnect(Database.java:410)

... 43 more

Caused by: java.sql.SQLException: Unable to load Hive Server 2 JDBC driver for the currently active Hadoop configuration

at org.apache.hive.jdbc.HiveDriver.getActiveDriver(HiveDriver.java:107)

at org.apache.hive.jdbc.HiveDriver.callWithActiveDriver(HiveDriver.java:121)

at org.apache.hive.jdbc.HiveDriver.connect(HiveDriver.java:132)

at java.sql.DriverManager.getConnection(Unknown Source)

at java.sql.DriverManager.getConnection(Unknown Source)

at org.pentaho.di.core.database.Database.connectUsingClass(Database.java:555)

... 44 more

Caused by: java.lang.reflect.InvocationTargetException

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at org.apache.hive.jdbc.HiveDriver.getActiveDriver(HiveDriver.java:105)

... 49 more

Caused by: java.lang.RuntimeException: Unable to load JDBC driver of type: hive2

at org.pentaho.hadoop.shim.common.CommonHadoopShim.getJdbcDriver(CommonHadoopShim.java:108)

... 54 more

Caused by: java.lang.Exception: JDBC driver of type 'hive2' not supported

at org.pentaho.hadoop.shim.common.CommonHadoopShim.getJdbcDriver(CommonHadoopShim.java:104)

... 54 more

上述报错的解决方法如下:

1.找到%KETTLE_HOME%/plugins/pehtaho-big-data-plugin/plugin.properties文件

2.修改plugin.properties文件中的值:active.hadoop.configuration=hdp13

3.修改后重启kettle

4.配置完成后,即可连接上对应的库

如果要使用hadoop-20,则需要添加如下jar包:

hadoop-core-1.2.1.jar

hive-common-0.13.0.jar

hive-jdbc-0.13.0.jar

hive-service-0.13.0.jar

libthrift-0.9.1.jar

slf4j-api-1.7.5.jar

httpclient-4.2.5.jar

httpcore-4.2.5.jar

总结:使用hive2的好处,优化了连接、增加安全性、并行度

beeline源码分析

本文基于hive-1.2.2源码

beeline模块在beeline目录下

beeline有2个hive driver:

org.apache.hive.jdbc.HiveDriver,用于连接hiveserver2

org.apache.hadoop.hive.jdbc.HiveDriver,用丛辩于连接hiveserver

beeline还支持连接mysql和postgresql:

1.由main函码郑姿数开始,真正执行是在begin(args, inputStream)函数

2.begin(args, inputStream)函数会分2步迟绝

2.1.加载beeline.properties

beeline会到当前用户目录下(linux是 HOME/.beeline,windows是 HOME/beeline)查找beeline.properties,如果找到,则加载其中以beeline.开头的配置项

2.2.解析命令行参数并执行

beeline从命令行中解析出driver,user,pass,url,auth等参数,并调用dispatch(command)函数

3.dispatch函数中,会区分beeline命令(以!开头)和sql,分别执行

4.具体执行逻辑在Commands.java,都是一些jdbc操作

如何用Hive访问Hadoop上数据

步骤

Hive提供了jdbc驱动,使得我们可以连接Hive并进行一些类关系型数据库的sql语句查询等操作,首先我们需要将这些驱动拷贝到报表工程下面,然后再建立连接,最后通过连接进行数据查询。

拷贝jar包到FR工程

将hadoop里的hadoop-common.jar拷贝至报表工渣态程appname/WEB-INF/lib下;

将hive里的hive-exec.jar、hive-jdbc.jar、hive-metastore.jar、hive-service.jar、libfb303.jar、log4j.jar、slf4j-api.jar、slf4j-log4j12.jar拷贝至报表工程appname/WEB-INF/lib下。

配置数据连接

启动设计器,打开服务器定义数据连接,新建JDBC连接。

在Hive 0.11.0版本之前,只有HiveServer服务可用,在程序操作Hive之前,必须在Hive安装的服务器上打开HiveServer服务。而HiveServer本身存在很多问题(比如:安全性、并发性等);针对这些问题,Hive0.11.0版本提供了一个全新的服务:HiveServer2,这个很好的解决HiveServer存在的安全性、并发性等问题,所以下面我们分别介绍HiveServer和HiveServer2配置数据连接的方式。

HiveServer

数据库驱动:org.apache.hadoop.hive.jdbc.HiveDriver;

URL:jdbc:hive://localhost:10000/default

注:hive服务默认端口为10000,根据实际情况修改端口;另外目前只支持竖祥默认数据库名default,所有的Hive都余梁搏支持。

测试连接,提示连接成功即可。

4

数据库驱动:org.apache.hive.jdbc.HiveDriver;

URL:jdbc:hive2://localhost:10000/default

注:该连接方式只支持Hive0.11.0及之后版本。

[img]

为什么linux的hive无法启动hiveserver2

需要先启动Hive的thriftserver:hiveserver2,然后在beelin命令行中通过!connect jdbc:hive2://localhost:10000 scott tiger org.apache.hive.jdbc.HiveDriver命令来胡此禅毕连接裤袭迅Hive.

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