"HTTPConnectionPool(host='127.0.0.1', port=9000): [Errno 111] Connection refused" error on AWS EMR when loading Stanford NLP model

Question

I am using the Stanford CoreNLP Model in an algorithm, which includes a Java client to the server, the (StanfordCoreNLPClient) in order to interact with CoreNLP, which is written in Java, via the command-line or its web service. Stanford CoreNLP has thus developed a Python package, called Stanza, including an API making requrests to Stanford CoreNLP server.

The model is working well on a notebook & on my personal computer. However, I did not manage to install stanza on an AWS EMR cluster, I always have the folowwing error that I don't manage to handle:

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Thus, I have tried to use another python package to use the Stanford CoreNLP Server, and the only one I manage to install simply on my AWS EMR is PyNLP (https://github.com/sina-al/pynlp), which is a Python wrapper for Stanford CoreNLP by Sina. Again, it works well on a notebook, as well as on my personal computer, but this time I manage to install it (pypi library) on an EMR cluster. But then, whenever I instanciate a StanfordCoreNLP object, i get the following error: "HTTPConnectionPool(host='127.0.0.1', port=9000): Max retries exceeded with url: /?properties=%7B%22serializer%22%3A+%22edu.stanford.nlp.pipeline.ProtobufAnnotationSerializer%22%2C+%22outputFormat%22%3A+%22serialized%22%2C+%22annotators%22%3A+%22entitymentions%22%7D (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7f6face84110>: Failed to establish a new connection: [Errno 111] Connection refused'))"... I really don't understand why, and above all why it works on an notebook & not on an AWS EMR.

For information, I am able to connect to the internet via the algorithm running on the AWS EMR cluster since I can use the "requests" module & do requests.get ... which is working well.

Could anyone explain me why I have got this error on the AWS EMR and not on the notebook or on my personal computer? Are the ports blocked on the AWS EMR? How could I do to make it work?

Thanks in advance for your precious help!!!

Answer 1

this issue won't come if you try the same on another machine. After the continuos hits to the target domain we may get the same error again.

Temporary sollution is to executing the same script from another machine.