spark-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Eskilson,Aleksander" <>
Subject Re: SparkR Reading Tables from Hive
Date Mon, 08 Jun 2015 20:57:05 GMT
Resolved, my hive-site.xml wasn’t in the conf folder. I can load tables into DataFrames as


From: <Eskilson>, Aleksander Eskilson <<>>
Date: Monday, June 8, 2015 at 3:38 PM
To: "<>" <<>>
Subject: SparkR Reading Tables from Hive

Hi there,

I’m testing out the new SparkR-Hive interop right now. I’m noticing an apparent disconnect
between the Hive store I have my data loaded and the store that sparkRHIve.init() connects
to. For example, in beeline:

0: jdbc:hive2://quickstart.cloudera:10000> show databases;
| database_name |
| default       |
0: jdbc:hive2://quickstart.cloudera:10000> show tables;
| tab_name      |
| my_table      |

But in sparkR:

> hqlContext <- sparkRHive.init(sc)
> showDF(sql(hqlContext, “show databases”))
| result  |
| default |
> showDF(tables(hqlContext, “default”))
+ tableName | isTemporary |
> showDF(sql(hqlContext, “show tables”))
+ tableName | isTemporary |

The data in my_table was landed into Hive from a CSV via kite-dataset. The installation of
Spark I’m working with was built separately, and operates as standalone. Could it be that
sparkRHive.init() is getting the wrong address of the Hive metastore? How could I peer into
the context and see what the address is set to, and if it’s wrong, reset it?

Ultimately, I’d like to be able to read my_table from Hive into a SparkR DataFrame which
ought to be possible with
> result <- sql(hqlContext, “SELECT * FROM my_table”)
But this fails with:
org.apache.spark.sql.AnalysisException: no such table my_table; line 1 pos 14
which is expected, I suppose, since we don’t see the table in the listing above.

Any thoughts?

Alek Eskilson
CONFIDENTIALITY NOTICE This message and any included attachments are from Cerner Corporation
and are intended only for the addressee. The information contained in this message is confidential
and may constitute inside or non-public information under international, federal, or state
securities laws. Unauthorized forwarding, printing, copying, distribution, or use of such
information is strictly prohibited and may be unlawful. If you are not the addressee, please
promptly delete this message and notify the sender of the delivery error by e-mail or you
may call Cerner's corporate offices in Kansas City, Missouri, U.S.A at (+1) (816)221-1024.

View raw message