AWS Glue job parameter not working

Question

Hi Team,

I am trying to take mongoDB backup and store to S3 as a parquet format, so that I have used AWS Glue spark script. When i execute without parameter it's working fine, But if i execute with parameter it's getting error. Below is my script, can someone help me to how to achieve this with parameters.

**Code**

```
import sys
from datetime import datetime
from awsglue.transforms import *
from awsglue.context import GlueContext
from pyspark.context import SparkContext
from pyspark.sql import SparkSession
from awsglue.utils import getResolvedOptions

args = getResolvedOptions(sys.argv, ['collection'])
args = getResolvedOptions(sys.argv, ['mongodatabase'])
args = getResolvedOptions(sys.argv, ['mongo_host'])
args = getResolvedOptions(sys.argv, ['password'])
args = getResolvedOptions(sys.argv, ['s3_bucket'])
args = getResolvedOptions(sys.argv, ['username'])

# Create a GlueContext
sc = SparkContext()
glueContext = GlueContext(sc)
spark = glueContext.spark_session

# Set the MongoDB connection options
mongo_uri = "mongodb://'username':'password'@'mongo_host':27017/'mongodatabase'.'collection'"
mongo_read_config = {
    "uri": mongo_uri,
    "spark.mongodb.input.uri": mongo_uri
}

# Read data from MongoDB
mongo_data = spark.read.format("com.mongodb.spark.sql.DefaultSource") \
    .options(**mongo_read_config) \
    .load()
    
    # Get the current year, month, and date
current_year = datetime.now().strftime("%Y")
current_month = datetime.now().strftime("%m")
current_date = datetime.now().strftime("%d")

# Create the S3 output path
#s3_bucket = 's3_bucket'
#database_name = 'mongo_db'
#collection_name = 'collection'

# Write the data to S3 as Parquet format
s3_output_path = f"s3://{s3_bucket}/{database_name}/{collection_name}/year={current_year}/month={current_month}/date={current_date}"
mongo_data.write.parquet(s3_output_path)

#job.commit()

```

If i execute without parameter (all the values are hard coded)the code it's working fine, How to resolve this issue.

Answer

Could you please share the error you are getting ?

It seems like it's just a problem on your code:

```python
args = getResolvedOptions(sys.argv, ['collection'])
args = getResolvedOptions(sys.argv, ['mongodatabase'])
args = getResolvedOptions(sys.argv, ['mongo_host'])
args = getResolvedOptions(sys.argv, ['password'])
args = getResolvedOptions(sys.argv, ['s3_bucket'])
args = getResolvedOptions(sys.argv, ['username'])
```

When you do this you are always overwriting your **args** variable, so you will only keep the last value (username).

You should do:

```python
args = getResolvedOptions(
                          sys.argv, 
                          ['collection',
                          'mongodatabase',
                          'mongo_host',
                          'password',
                          's3_bucket',
                          'username']
)
```

To access these parameters all you have to do is call args[] like username = args['username'].

Check here for [Glue documentation about getResolvedOptions](https://docs.aws.amazon.com/glue/latest/dg/aws-glue-api-crawler-pyspark-extensions-get-resolved-options.html).

Edit: to access this parameter you must call args['username']. 'username' itself is just a string.
```python
# Set the MongoDB connection options
mongo_uri = f"mongodb://{args['username']}:{args['password']}@{args['mongo_host']}:27017/{args['mongodatabase']}.{args['collection']}"
mongo_read_config = {
    "uri": mongo_uri,
    "spark.mongodb.input.uri": mongo_uri
}
```

Answer

@Arthur Lopes

I am getting below error

**An error occurred while calling o92.load. Exception authenticating MongoCredential{mechanism=SCRAM-SHA-1, userName='username', source=''mongo_db'', password=, mechanismProperties=}**

AWS Glue job parameter not working

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