Hi, even I am facing the same trouble when trying to load Ambari web page, it shows 502 error.   It was working fine 2 days back but the error is showing from today when I tried to login in the morning. I have tried all the replies stated above, none worked. I will be grateful if someone can resolve this issue at the earliest.   Many Thanks ... View more

Impala doesnt support the ROW FORMAT SERDE 'org.apache.hadoop.hive.serde2.OpenCSVSerde' even in newer version like v3.4.0. Any other option to remove double quotes in the output from Impala where the input csv file has quotes? ... View more

I resolved this by shutting down the firewall on the HDP Sandbox container: sudo systemctl stop firewalld sudo systemctl disable firewalld ... View more

Hi Dennis,   As mentioned in the (edited) post, the solution suggested above finally worked for me. Thanks again for the help!   Regards, Michal ... View more

Yes. You can use the Kernel Gateway feature of Jupyter to trigger notebooks over REST. Or you can also go over ZeroMQ. https://ndres.me/post/jupyter-notebook-rest-api/ ... View more

I am doing some practices, for some questions, there could be various solutions, for example, I can use RDD operations to do some filtering, sorting, and grouping; with DataFrame and SparkSQL, it is even easier to me to get the same result.   My question is will there be a requirement in the exam that some questions must be resolved using RDD, not DataFrame+SparkSQL. or vice versa?   Thank you. ... View more

Thank you. ... View more

@Luis Figueroa: Thank you for your suggestion however it doesn't work for me: I am using HDP 2.5, and I need to transfer a file from my local windows host to sandbox, here is my command: scp -P 2122 /RXIE/..../test.csv root@localhost:root I received the following error message: ssh: connection to host localhost port 2122: Connection refused Thank you. ... View more

I tried again using the hortonworks sandbox's ip address, this time it says Connection refused (tried port 2222, failed with same error) scp C/RXIE/Learning/Github/spark-master/examples/src/main/python/streaming/kafka_wordcount.py root@192.168.128.119:/root ... View more