HDP & Core Hadoop Cheat Sheet

http://127.0.0.1:8888/  (HUE: hue/1111  and   AMBARI: admin/admin)

ssh root@127.0.0.1 -p 2222 (default password is "hadoop")

scp -P 2222 example.jar mruser@127.0.0.1:/home/mruser/mrJars (password is "Sprint2000" for linux user and "hadoop" for one created in hue)

if you make changes to /etc/sysconfig/network-scripts/ifcfg-eth0, then make sure you rm /etc/udev/rules.d/70-persistent-net.rules

• Benchmarking and Stress Testing a Hadoop Cluster

• Teragen & Terasort on HDP (the argument is how many lines of 100 bytes you want - 10,000,000,000 would net you 1TB of data)

  • HDP 1.3.2 (correctly identified that 100000000 would give you 10GB)

  • HDP 2.0.9.0 (incorrectly identifies that 10000 would give you 10GB, but that is really only 1MB)

• How to prepare your CentOS6 to install HDP 2.x

• Examples of Ambari REST API

  • https://community.cloudera.com/t5/Support-Questions/how-to-capture-all-ambari-services-components-status-by-API/td-p/179701

  • https://community.cloudera.com/t5/Community-Articles/Popular-Ambari-REST-API-Commands/ta-p/249359

• Ambari Shell for CLI commands; https://cwiki.apache.org/confluence/display/AMBARI/Ambari+Shell

• Script to iterate down a dir tree and copy everything into HDFS; http://one-line-it.blogspot.com/2013/05/hadoop-copy-directly-to-hdfs-from.html

• How to set the number of mappers and reducers of Hadoop in command line

• Details on HDFS Balancer command; http://www.swiss-scalability.com/2013/08/hadoop-hdfs-balancer-explained.html

• Oracle JDK 7 Archive Download Page

• SAP HANA and HDP Integration; http://hortonworks.com/wp-content/uploads/2013/09/Demo-Tutorial-Leveraging_SAP_HANA__HDP_Jan_2014.pdf

• Creating & registering custom Ambari alerts; https://community.hortonworks.com/articles/38149/how-to-create-and-register-custom-ambari-alerts.html

• Managing Hadoop DR with distcp and snapshots; https://community.cloudera.com/t5/Community-Articles/Managing-Hadoop-DR-with-distcp-and-snapshots/ta-p/248362

Kill a hadoop job:

yarn application -kill $ApplicationId

You can get a list of all ApplicationId's doing:

yarn application -list

dfs.datanode.max.transfer.threads - default is 1024, but bump to >= 4096 or >= 16K for HBase