org.apache.hadoop.hbase.chaos

Class ChaosAgent

java.lang.Object

org.apache.hadoop.hbase.chaos.ChaosAgent

All Implemented Interfaces:

Closeable, AutoCloseable, Runnable, org.apache.zookeeper.Watcher

@InterfaceAudience.Private
public class ChaosAgent
extends Object
implements org.apache.zookeeper.Watcher, Closeable, Runnable

An agent for executing destructive actions for ChaosMonkey. Uses ZooKeeper Watchers and LocalShell, to do the killing and getting status of service on targeted host without SSH. uses given ZNode Structure: /perfChaosTest (root) | | /chaosAgents (Used for registration has hostname ephemeral nodes as children) | | /chaosAgentTaskStatus (Used for task Execution, has hostname persistent nodes as child with tasks as their children) | | /hostname | | /task0000001 (command as data) (has two types of command : 1: starts with "exec" for executing a destructive action. 2: starts with "bool" for getting only status of service.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static class	ChaosAgent.LocalShell Executes Command locally.

Nested classes/interfaces inherited from interface org.apache.zookeeper.Watcher

org.apache.zookeeper.Watcher.Event, org.apache.zookeeper.Watcher.WatcherType

Constructor Summary

Constructors

Constructor and Description
ChaosAgent(org.apache.hadoop.conf.Configuration conf, String quorum, String agentName)

Method Summary

Modifier and Type	Method and Description
void	close()
void	createEphemeralZNode(String path, byte[] data) Function to create EPHEMERAL ZNODE with given path and data as params.
void	createZNode(String path, byte[] data) Function to create PERSISTENT ZNODE with given path and data given as params
void	process(org.apache.zookeeper.WatchedEvent watchedEvent)
void	run()
void	setStatusOfTaskZNode(String taskZNode, String status) sets given Status for Task Znode

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ChaosAgent

public ChaosAgent(org.apache.hadoop.conf.Configuration conf,
                  String quorum,
                  String agentName)

Method Detail

createZNode

public void createZNode(String path,
                        byte[] data)

Function to create PERSISTENT ZNODE with given path and data given as params

Parameters:

path - Path at which ZNode to create

data - Data to put under ZNode

createEphemeralZNode

public void createEphemeralZNode(String path,
                                 byte[] data)

Function to create EPHEMERAL ZNODE with given path and data as params.

Parameters:

path - Path at which Ephemeral ZNode to create

data - Data to put under ZNode

setStatusOfTaskZNode

public void setStatusOfTaskZNode(String taskZNode,
                                 String status)

sets given Status for Task Znode

Parameters:

taskZNode - ZNode to set status

status - Status value

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Throws:

IOException

run

public void run()

Specified by:

run in interface Runnable

process

public void process(org.apache.zookeeper.WatchedEvent watchedEvent)

Specified by:

process in interface org.apache.zookeeper.Watcher