从 Scala (shark-shell) 访问 Shark 表 (Hive)

本文介绍了从 Scala (shark-shell) 访问 Shark 表 (Hive)的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我有在 hive-0.9.0 上运行的 shark-0.8.0.我可以通过调用 shark 在 Hive 上编程.我创建了几个表并加载了数据.

I have shark-0.8.0 which runs on hive-0.9.0. I am able to program on Hive by invoking shark. I created a few tables and loaded them with data.

现在，我正在尝试使用 Scala 访问这些表中的数据.我使用 shark-shell 调用了 Scala shell.但是当我尝试选择时，我收到了表格不存在的错误.

Now, I am trying to access the data from these tables using Scala. I invoked the Scala shell using shark-shell. But when I try to select, I get an error that the table is not present.

scala> val artists = sc.sql2rdd("select artist from default.lastfm")

Hive history file=/tmp/hduser2/hive_job_log_hduser2_201405091617_1513149542.txt
151.738: [GC 317312K->83626K(1005568K), 0.0975990 secs]
151.836: [Full GC 83626K->76005K(1005568K), 0.4523880 secs]
152.313: [GC 80536K->76140K(1005568K), 0.0030990 secs]
152.316: [Full GC 76140K->62214K(1005568K), 0.1716240 secs]
FAILED: Error in semantic analysis: Line 1:19 Table not found 'lastfm'
shark.api.QueryExecutionException: FAILED: Error in semantic analysis: Line 1:19 Table not found 'lastfm'
    at shark.SharkDriver.tableRdd(SharkDriver.scala:149)
    at shark.SharkContext.sql2rdd(SharkContext.scala:100)
    at <init>(<console>:17)
    at <init>(<console>:22)
    at <init>(<console>:24)
    at <init>(<console>:26)
    at <init>(<console>:28)
    at <init>(<console>:30)
    at <init>(<console>:32)
    at .<init>(<console>:36)
    at .<clinit>(<console>)
    at .<init>(<console>:11)
    at .<clinit>(<console>)
    at $export(<console>)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.apache.spark.repl.SparkIMain$ReadEvalPrint.call(SparkIMain.scala:629)
    at org.apache.spark.repl.SparkIMain$Request$$anonfun$10.apply(SparkIMain.scala:890)
    at scala.tools.nsc.interpreter.Line$$anonfun$1.apply$mcV$sp(Line.scala:43)
    at scala.tools.nsc.io.package$$anon$2.run(package.scala:25)
    at java.lang.Thread.run(Thread.java:744)

来自文档(https://github.com/amplab/shark/wiki/Shark-User-Guide)，这些步骤足以启动和运行 Shark 并使用 Scala 选择数据.或者我错过了什么?是否有一些配置文件需要修改才能从 shark-shell 访问 Shark?

From the documentation (https://github.com/amplab/shark/wiki/Shark-User-Guide), these steps are enough to get Shark up and running and select data using Scala. Or am I missing something? Is there some configuration file that needs to be modified to enable access to Shark from shark-shell ?

推荐答案

您是否更新了shark-hive 目录配置以正确反映 hive Metastore jdbc 连接信息?

Have you updated your shark-hive directory configuration to properly reflect the hive metastore jdbc connection info?

您需要将 hive-default.xml 复制到 hive-site.xml .然后确保设置了 Metastore 属性.

You will need to copy the hive-default.xml to hive-site.xml . Then ensure the metastore properties are set.

这里是 hive-site.xml 中的基本信息

Here is the basic info in hive-site.xml

<property>
  <name>javax.jdo.option.ConnectionURL</name>
  <value>jdbc:mysql://myhost/metastore</value>
  <description>the URL of the MySQL database</description>
</property>

<property>
  <name>javax.jdo.option.ConnectionDriverName</name>
  <value>com.mysql.jdbc.Driver</value>
</property>

<property>
  <name>javax.jdo.option.ConnectionUserName</name>
  <value>hive</value>
</property>

<property>
  <name>javax.jdo.option.ConnectionPassword</name>
  <value>mypassword</value>
</property>

您可以在此处获取更多详细信息:配置 hive Metastore

You can get more details here: configuring hive metastore

这篇关于从 Scala (shark-shell) 访问 Shark 表 (Hive)的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！

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