Hello all:

I have an application that requires accessing DynamoDB tables. Each worker establishes a connection with the database on its own.

I have added both `AWS_ACCESS_KEY_ID` and `AWS_SECRET_ACCESS_KEY` to both master's and workers `spark-env.sh` file. I have also run the file using `sh` to make sure the variables are exported.

When the code runs, I always get the error:

    Caused by: com.amazonaws.AmazonClientException: Unable to load AWS credentials from any provider in the chain
    at com.amazonaws.auth.AWSCredentialsProviderChain.getCredentials(AWSCredentialsProviderChain.java:131)
    at com.amazonaws.http.AmazonHttpClient.getCredentialsFromContext(AmazonHttpClient.java:774)
    at com.amazonaws.http.AmazonHttpClient.executeOneRequest(AmazonHttpClient.java:800)
    at com.amazonaws.http.AmazonHttpClient.executeHelper(AmazonHttpClient.java:695)
    at com.amazonaws.http.AmazonHttpClient.doExecute(AmazonHttpClient.java:447)
    at com.amazonaws.http.AmazonHttpClient.executeWithTimer(AmazonHttpClient.java:409)
    at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:358)
    at com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient.doInvoke(AmazonDynamoDBClient.java:2051)
    at com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient.invoke(AmazonDynamoDBClient.java:2021)
    at com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient.describeTable(AmazonDynamoDBClient.java:1299)
    at com.amazon.titan.diskstorage.dynamodb.DynamoDBDelegate.describeTable(DynamoDBDelegate.java:635)
    ... 27 more

It seems that the AWS SDK has failed to load the credentials even though they're exported. When I do export command, it returns the credentials. What type of solution should I try?

Thanks,
Mohamed Taher Alrefaie.