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From Craig Roberts <craig.robe...@frogasia.com>
Subject Re: PySpark and Phoenix Dynamic Columns
Date Tue, 28 Feb 2017 06:52:56 GMT
Hi Josh,

Thanks for the info. Views do work, and that helps with some of our use
cases anyway.

I was hoping to use Spark as a means of running a long-running query
without overly taxing everything, but since both the Spark/MapReduce
integrations use the same underlying JDBC connections (as far as I can tell
from the code), I've instead just bumped up the timeouts as suggested by a
few other threads / forum posts.

Thanks again for the help,

*Craig Roberts*
*Senior Developer*

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On 24 February 2017 at 23:06, Josh Mahonin <jmahonin@gmail.com> wrote:

> Hi Craig,
>
> I think this is an open issue in PHOENIX-2648 (https://issues.apache.org/
> jira/browse/PHOENIX-2648)
>
> There seems to be a workaround by using a 'VIEW' instead, as mentioned in
> that ticket.
>
> Good luck,
>
> Josh
>
> On Thu, Feb 23, 2017 at 11:56 PM, Craig Roberts <
> craig.roberts@frogasia.com> wrote:
>
>> Hi all,
>>
>> I've got a (very) basic Spark application in Python that selects some
>> basic information from my Phoenix table. I can't quite figure out how (or
>> even if I can) select dynamic columns through this, however.
>>
>> Here's what I have;
>>
>> from pyspark import SparkContext, SparkConf
>> from pyspark.sql import SQLContext
>>
>> conf = SparkConf().setAppName("pysparkPhoenixLoad").setMaster("local")
>> sc = SparkContext(conf=conf)
>> sqlContext = SQLContext(sc)
>>
>> df = sqlContext.read.format("org.apache.phoenix.spark") \
>>        .option("table", """MYTABLE("dyamic_column" VARCHAR)""") \
>>        .option("zkUrl", "127.0.0.1:2181:/hbase-unsecure") \
>>        .load()
>>
>> df.show()
>> df.printSchema()
>>
>>
>> I get a "org.apache.phoenix.schema.TableNotFoundException:" error for
>> the above.
>>
>> If I try and load the data frame as a table and query that with SQL:
>>
>> sqlContext.registerDataFrameAsTable(df, "test")
>> sqlContext.sql("""SELECT * FROM test("dynamic_column" VARCHAR)""")
>>
>>
>> I get a bit of a strange exception:
>>
>> py4j.protocol.Py4JJavaError: An error occurred while calling o37.sql.
>> : java.lang.RuntimeException: [1.19] failure: ``union'' expected but `('
>> found
>>
>> SELECT * FROM test("dynamic_column" VARCHAR)
>>
>>
>>
>> Does anybody have a pointer on whether this is supported and how I might
>> be able to query a dynamic column? I haven't found much information on the
>> wider Internet about Spark + Phoenix integration for this kind of
>> thing...Simple selects are working. Final note: I have (rather stupidly)
>> lower-cased my column names in Phoenix, so I need to quote them when I
>> execute a query (I'll be changing this as soon as possible).
>>
>> Any assistance would be appreciated :)
>> *-- Craig*
>>
>
>

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