Extract sheet names using pyspark

[Krukosz]

Am I using the newest version of the library?

• I have made sure that I'm using the latest version of the library.

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

I have problem with class WorkbookReader. Code in Python looks like:

reader = spark._jvm.com.crealytics.spark.excel.WorkbookReader( {"path": "Worktime.xlsx"}, spark.sparkContext._jsc.hadoopConfiguration() ) sheetnames = reader.sheetNames()

My problems:

1. I cannot use hadoopConfiguration explicitly due to security options
2. When I omit second argument in constructor I get error:

py4j.Py4JException: Constructor com.crealytics.spark.excel.WorkbookReader([class java.util.HashMap]) does not exist

In PR #196 there's a discussion about using apply method but I don't know how to call it.

Is there anyone who made working it on PySpark? I can't use Scala, because is blocked by administrator in my environment.

Expected Behavior

No response

Steps To Reproduce

No response

Environment

- Spark version:Apache Spark 3.4.1
- Spark-Excel version: Scala 2.1
- OS:
- Cluster environment: Databricks 13.3 LTS

Anything else?

No response

[nightscape]

Does this help? #196 (comment)

[Krukosz]

Oh, I tested it on "legacy" Databricks Cluster and it works.

My code:

reader = spark._jvm.com.crealytics.spark.excel.WorkbookReader.apply({"path": 'my_file.xlsx'}, spark.sparkContext._jsc.hadoopConfiguration())

d = reader.sheetNames()

print(d)

In Unity Catalog environment i'm getting error (it's directly related to Cluster Mode, it cannot be changed in my case):

py4j.security.Py4JSecurityException: Method public org.apache.hadoop.conf.Configuration org.apache.spark.api.java.JavaSparkContext.hadoopConfiguration() is not whitelisted on class class org.apache.spark.api.java.JavaSparkContext

Is there any other way to get sheet names, without WorkbookReader constructor? I'd rather not mixing crealytics spark code with pandas or any other library.

[nightscape]

This sounds related: https://learn.microsoft.com/en-us/answers/questions/1193968/py4j-security-py4jsecurityexception-databricks

[ewong18]

We are having the same issue with our Scala code in Unity Catalog (DBR 14.3 LTS)

As per this documentation: https://learn.microsoft.com/en-us/azure/databricks/compute/access-mode-limitations#spark-api-limitations-and-requirements-for-unity-catalog-shared-access-mode sparkContext (and therefore hadoopConfiguration) can't be accessed in DBR 14.0 and newer.

So, even if there's a workaround for 13.3 for now, newer runtimes won't be able to support it.

[nightscape]

Hmm, that would require a bigger refactoring then because we also need a HadoopConfiguration in the standard use case (even without reading sheet names):
https://github.com/crealytics/spark-excel/blob/main/src/main/scala/com/crealytics/spark/excel/DefaultSource.scala#L38