org.apache.hadoop.chukwa.analysis.salsa.visualization

Class Heatmap

java.lang.Object

org.apache.hadoop.chukwa.analysis.salsa.visualization.Heatmap

public class Heatmap
extends Object

Static image rendering for heatmap visualization of spatial HDFS activity patterns for scalable rendering on front-end (web-browser) Handles database data retrieval, transforming data to form for visualization elements, and initializing and calling visualization elements

Constructor Summary

Constructors

Constructor and Description
Heatmap()
Heatmap(javax.servlet.http.HttpServletRequest request)
Heatmap(String timezone, String cluster, String event_type, String query_stat_type, HashMap<String,String> valmap) Constructor for Swimlanes visualization object
Heatmap(String timezone, String cluster, String query_state, String query_stat_type, HashMap<String,String> valmap, int w, int h)
Heatmap(String timezone, String cluster, String query_state, String query_stat_type, HashMap<String,String> valmap, String shuffles)

Method Summary

Modifier and Type	Method and Description
org.apache.hadoop.chukwa.analysis.salsa.visualization.Heatmap.HeatmapData	getData() Interfaces with database to get data and populate data structures for rendering
boolean	getImage(OutputStream output, String img_fmt, double scale) Generates image in specified format, and writes image as binary output to supplied output stream
void	run() Actual code that calls data, generates heatmap, and saves it
void	setDimensions(int width, int height) Set dimensions of image to be generated Call before calling @see #run
void	setLegend(boolean legendopt) Specify whether to print labels of hosts along axes Call before calling @see #run

Methods inherited from class java.lang.Object

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

Constructor Detail

Heatmap

public Heatmap()

Heatmap

public Heatmap(String timezone,
               String cluster,
               String event_type,
               String query_stat_type,
               HashMap<String,String> valmap)

Constructor for Swimlanes visualization object

Parameters:

timezone - Timezone string from environment

cluster - Cluster name from environment

event_type - Whether to display shuffles or not

query_stat_type - Query state type

valmap - HashMap of key/value pairs simulating parameters from a HttpRequest

Heatmap

public Heatmap(String timezone,
               String cluster,
               String query_state,
               String query_stat_type,
               HashMap<String,String> valmap,
               String shuffles)

Heatmap

public Heatmap(String timezone,
               String cluster,
               String query_state,
               String query_stat_type,
               HashMap<String,String> valmap,
               int w,
               int h)

Heatmap

public Heatmap(javax.servlet.http.HttpServletRequest request)

Method Detail

setDimensions

public void setDimensions(int width,
                          int height)

Set dimensions of image to be generated Call before calling @see #run

Parameters:

width - Image width in pixels

height - Image height in pixels

setLegend

public void setLegend(boolean legendopt)

Specify whether to print labels of hosts along axes Call before calling @see #run

Parameters:

legendopt - Flag to control plot legends

getImage

public boolean getImage(OutputStream output,
                        String img_fmt,
                        double scale)

Generates image in specified format, and writes image as binary output to supplied output stream

Parameters:

output - Image output stream

img_fmt - Image format

scale - Image scale

Returns:

true if image is saved

run

public void run()

Actual code that calls data, generates heatmap, and saves it

getData

public org.apache.hadoop.chukwa.analysis.salsa.visualization.Heatmap.HeatmapData getData()

Interfaces with database to get data and populate data structures for rendering

Returns:

heat map data JSON