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1. Stop Ambari server
2. Log on to ambari server host shell
3. Run 'psql -U ambari-server ambari'
4. Enter password ****  (this password is stored in
/etc/ambari-server/conf/password.dat)
5. In psql:
update ambari.users set
user_password='538916f8943ec225d97a9a86a2c6ec0818c1cd400e09e03b660fdaaec4af29ddbb6f2b1033b81b00'
where user_name='admin'
6. Quit psql

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##Reactive System Design Links

#Articles and Papers

• The Reactive Manifesto: http://www.reactivemanifesto.org/
• https://en.wikipedia.org/wiki/Reactive_programming
• https://en.wikipedia.org/wiki/Functional_reactive_programming
• Design Methods for Reactive Systems book slides: http://booksite.elsevier.com/9781558607552/slides/slides.pdf
• Programming without a callstack Event Driven Architectures By G Hohpe: http://www.eaipatterns.com/docs/EDA.pdf
• On Distributed Memory Systems: http://blog.paralleluniverse.co/2012/07/10/on-distributed-memory/
• Disruptor source code, papers and articles: https://lmax-exchange.github.io/disruptor/

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Extend Ambari

Introduction

Hortonworks wrote a great article how to add new components into Amabri:

https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=38571133

Unfortunately, this document is not enough if you really want to add your own component.

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public class HCatInputFormat extends InputFormat<SerializableWritable<Writable>, HCatRecord> {
	
	private final org.apache.hcatalog.mapreduce.HCatInputFormat input;
	
	public HCatInputFormat() {
		input = new org.apache.hcatalog.mapreduce.HCatInputFormat();
	}

	@Override
	public RecordReader<SerializableWritable<Writable>, HCatRecord> createRecordReader(