{"id":106763,"date":"2020-09-14T07:00:00","date_gmt":"2020-09-14T04:00:00","guid":{"rendered":"https:\/\/www.javacodegeeks.com\/?p=106763"},"modified":"2020-09-11T09:30:20","modified_gmt":"2020-09-11T06:30:20","slug":"aws-glue-can-not-create-a-path-from-an-empty-string","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2020\/09\/aws-glue-can-not-create-a-path-from-an-empty-string.html","title":{"rendered":"AWS Glue \u2013 Can not create a Path from an empty string"},"content":{"rendered":"

1. Overview<\/h2>\n

I was receiving this error while trying to run an AWS Glue job that communicated with a DB2 11 instance:<\/p>\n

\n
\n\n\n\n
\n
1<\/div>\n<\/td>\n
\n
\n
Exception <\/code>in<\/code> thread <\/code>\"main\"<\/code> java.lang.IllegalArgumentException: Can not create a Path from an empty string<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

As we know, AWS Glue is a fully managed ETL service that is built on an Apache Spark environment. As such, AWS Glue jobs can be written in Scala or Python (pyspark).<\/p>\n

My Glue job was written in Python and this error didn\u2019t really seem to tell me much. Where is there an empty string I wondered?<\/p>\n

I searched online and found a lot of results that did not apply to me, such as this one on apache.org<\/a>, where the solution is: \u201cI degradate the spark version from 2.2.0 to 2.1.1, is resolved with the error.
So phoenix 4.11 -hbase1.20 with spark2.2.0 is not work, the compatibility is not good.\u201d<\/p>\n

I have limited AWS Glue knowledge at this point. However, since it is a managed service, I did not find it applicable.<\/p>\n

Thankfully, I did manage to solve this issue.<\/p>\n

2. Solution<\/h2>\n

Here are the steps I took to solve the Can not create a Path from an empty string<\/em> error in my Glue job:<\/p>\n

    \n
  1. Ensure you can connect to the database using software like DBeaver. Check the schema.<\/li>\n
  2. Remove all code from Glue job that did not create connection to DB2 database and run a simple command. In my case, this command was df.printSchema()<\/em><\/li>\n
  3. Remove connection string information for database and enter it all in again. Double check that it is 100% correct.<\/li>\n
  4. Create a new Glue job and double check IAM permissions in AWS.<\/li>\n
  5. Ensure drivers are available in \u201cSecurity configuration, script libraries, and job parameters (optional)\u201d portion of job creation.<\/li>\n
  6. Ensure connection is available in Required Connections of job creation\/edit job.<\/li>\n<\/ol>\n

    3. Simple Code Example for Testing Database<\/h2>\n

    As I said, I chose to test the least amount of code possible to ensure database connectivity. If you are having this error, it is possible you have a database connection issue or perhaps a query issue for your table.<\/p>\n

    Here is the code I ended up using for my test:<\/p>\n

    \n
    \n\n\n\n
    \n
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    		\n
    \n
    import<\/code> sys<\/code><\/div>\n
    import<\/code> boto3<\/code><\/div>\n
    import<\/code> json<\/code><\/div>\n
    from awsglue.transforms <\/code>import<\/code> *<\/code><\/div>\n
    from awsglue.utils <\/code>import<\/code> getResolvedOptions<\/code><\/div>\n
    from pyspark.context <\/code>import<\/code> SparkContext<\/code><\/div>\n
    from awsglue.context <\/code>import<\/code> GlueContext<\/code><\/div>\n
    from awsglue.dynamicframe <\/code>import<\/code> DynamicFrame<\/code><\/div>\n
    from awsglue.job <\/code>import<\/code> Job<\/code><\/div>\n
    from pyspark.sql.functions <\/code>import<\/code> *<\/code><\/div>\n
    from pyspark.sql.functions <\/code>import<\/code> col, asc<\/code><\/div>\n
     <\/div>\n
    args = getResolvedOptions(sys.argv, [<\/code>'JOB_NAME'<\/code>])<\/code><\/div>\n
     <\/div>\n
    sc = SparkContext()<\/code><\/div>\n
    glueContext = GlueContext(sc)<\/code><\/div>\n
    spark = glueContext.spark_session<\/code><\/div>\n
    job = Job(glueContext)<\/code><\/div>\n
    job.init(args[<\/code>'JOB_NAME'<\/code>], args)<\/code><\/div>\n
     <\/div>\n
    db_username = <\/code>\"username\"<\/code><\/div>\n
    db_password = <\/code>\"password!\"<\/code><\/div>\n
    db_url = <\/code>\"jdbc:db2:\/\/12.345.67.891:50000\/somedatabase\"<\/code><\/div>\n
    table_name = <\/code>\"database.sometable\"<\/code><\/div>\n
    jdbc_driver_name = <\/code>\"com.ibm.db2.jcc.DB2Driver\"<\/code><\/div>\n
     <\/div>\n
    df<\/code> = glueContext.<\/code>read<\/code>.<\/code>format<\/code>(<\/code>\"jdbc\"<\/code>).option(<\/code>\"driver\"<\/code>, jdbc_driver_name).option(<\/code>\"url\"<\/code>, db_url).option(<\/code>\"dbtable\"<\/code>,<\/code><\/div>\n
                                                                                                         <\/code>table_name).option(<\/code><\/div>\n
        <\/code>\"user\"<\/code>, db_username).option(<\/code>\"password\"<\/code>, db_password).load()<\/code><\/div>\n
     <\/div>\n
    db2_schema = <\/code>df<\/code>.printSchema()<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

    There are unnecessary imports, of course. If you change this code for your needs, it will work though.

    <\/div> <\/div><\/p>\n

    4. Conclusion<\/h2>\n

    If you are receiving this mysterious error on AWS Glue:<\/p>\n

    \n
    \n\n\n\n
    \n
    1<\/div>\n<\/td>\n
    		\n
    \n
    Exception <\/code>in<\/code> thread <\/code>\"main\"<\/code> java.lang.IllegalArgumentException: Can not create a Path from an empty string<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

    You can take comfort in being able to isolate the issue to a database issue. Check the steps I mentioned above and do them methodically. I believe you will be able to learn exactly what the cause of it is.<\/p>\n

    \n\n\n\n
    \n

    Published on Java Code Geeks with permission by Michael Good, partner at our JCG program<\/a>. See the original article here: AWS Glue \u2013 Can not create a Path from an empty string<\/a><\/p>\n

    Opinions expressed by Java Code Geeks contributors are their own.<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

    1. Overview I was receiving this error while trying to run an AWS Glue job that communicated with a DB2 11 instance: 1 Exception in thread “main” java.lang.IllegalArgumentException: Can not create a Path from an empty string As we know, AWS Glue is a fully managed ETL service that is built on an Apache Spark …<\/p>\n","protected":false},"author":5558,"featured_media":112,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[758],"class_list":["post-106763","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-enterprise-java","tag-aws"],"yoast_head":"\nAWS Glue \u2013 Can not create a Path from an empty string - Java Code Geeks<\/title>\n<meta name=\"description\" content=\"1. 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