Someone from Docs team can take a look. Ping @Frank Welsch ... View more

I think the document has been updated. The older link does not exist anymore on that page. ... View more

Yes the link does not seem to be working: https://raw.githubusercontent.com/hortonworks/tutorials/hdp/assets/data.csv Can someone from Docs team take a look. Ping @Frank Welsch ... View more

Sure, that might happen sometime. Can you please accept this answer and close this question. ... View more

@Aditya Kumar Roy JAVA_HOME env variable should be set till the jdk home path i.e it should be /root/java/jdk1.8.0_121, for your case. Can you try setting the same, and let us know if that resolves the issue. ... View more

@vsubramanian - Can you verify if HDFS service was up when you tried to start History server, if yes was the Namenode out of Safemode. Another thing to check will be that /usr/hdp/2.5.3.0-37/hadoop/mapreduce.tar.gz exists, and that you are manually able to copy the file to HDFS. There are similar questions posted with issue: https://community.hortonworks.com/questions/41697/history-server-fails-to-start-on-a-new-ha-hdp-2347.html https://community.hortonworks.com/questions/30840/history-server-not-able-to-start-after-a-fresh-ins.html https://community.hortonworks.com/questions/9341/history-server-and-hive-server2-is-not-coming-up-i.html ... View more

Below is a good post on Quora which discuss this: https://www.quora.com/Is-there-any-certification-for-Scala-programming-Which-one-is-well-recognized-across-the-industry ... View more

In the posted stack trace, there are lot of GC pauses. Below is a good article explaining Namenode Garbage Collection practices: https://community.hortonworks.com/articles/14170/namenode-garbage-collection-configuration-best-pra.html ... View more