Hi Gerard,
I’ve never had an issue using the HiveContext without a hive-site.xml
configured. However, one issue you may have is if multiple users are starting
the HiveContext from the same path, they’ll all be trying to store the default
Derby metastore in the same location. Also, if you want them to be able to
persist permanent table metadata for SparkSQL then you’ll want to set up a true
metastore.
The other thing it could be is Hive dependency collisions from the classpath,
but that shouldn’t be an issue since you said it’s standalone (not a Hadoop
distro right?).
Thanks,
Silvio
From: Gerard Maas <gerard.m...@gmail.com>
Date: Thursday, May 26, 2016 at 5:28 AM
To: spark users <user@spark.apache.org>
Subject: HiveContext standalone => without a Hive metastore
Hi,
I'm helping some folks setting up an analytics cluster with Spark.
They want to use the HiveContext to enable the Window functions on
DataFrames(*) but they don't have any Hive installation, nor they need one at
the moment (if not necessary for this feature)
When we try to create a Hive context, we get the following error:
> val sqlContext = new org.apache.spark.sql.hive.HiveContext(sparkContext)
java.lang.RuntimeException: java.lang.RuntimeException: Unable to instantiate
org.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClient
at
org.apache.hadoop.hive.ql.session.SessionState.start(SessionState.java:522)
Is my HiveContext failing b/c it wants to connect to an unconfigured Hive
Metastore?
Is there a way to instantiate a HiveContext for the sake of Window support
without an underlying Hive deployment?
The docs are explicit in saying that that is should be the case: [1]
"To use a HiveContext, you do not need to have an existing Hive setup, and all
of the data sources available to aSQLContext are still available. HiveContext
is only packaged separately to avoid including all of Hive’s dependencies in
the default Spark build."
So what is the right way to address this issue? How to instantiate a
HiveContext with spark running on a HDFS cluster without Hive deployed?
Thanks a lot!
-Gerard.
(*) The need for a HiveContext to use Window functions is pretty obscure. The
only documentation of this seems to be a runtime exception:
"org.apache.spark.sql.AnalysisException: Could not resolve window function
'max'. Note that, using window functions currently requires a HiveContext;"
[1]
http://spark.apache.org/docs/latest/sql-programming-guide.html#getting-started
