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2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *     http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
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17   */
18  package org.apache.hadoop.chukwa.hicc.rest;
19  
20  import java.net.InetAddress;
21  import java.net.URI;
22  import java.net.URISyntaxException;
23  import java.net.UnknownHostException;
24  import java.util.ArrayList;
25  import java.util.List;
26  
27  import org.apache.hadoop.chukwa.hicc.bean.Chart;
28  import org.apache.hadoop.chukwa.hicc.bean.Dashboard;
29  import org.apache.hadoop.chukwa.hicc.bean.Series;
30  import org.apache.hadoop.chukwa.hicc.bean.SeriesMetaData;
31  import org.apache.hadoop.chukwa.hicc.bean.Widget;
32  
33  @edu.umd.cs.findbugs.annotations.SuppressWarnings(value="MS_SHOULD_BE_FINAL")
34  public class Examples {
35    // Chart examples
36    public static Chart SYSTEM_LOAD_AVERAGE;
37    public static Chart CPU_UTILIZATION;
38    public static Chart MEMORY_UTILIZATION;
39    public static Chart DISK_UTILIZATION;
40    public static Chart NETWORK_UTILIZATION;
41    public static Chart SWAP_UTILIZATION;
42    public static Chart NAMENODE_MEMORY;
43    public static Chart HDFS_USAGE;
44    public static Chart RESOURCE_MANAGER_MEMORY;
45    public static Chart NODE_MANAGER_HEALTH;
46    public static Chart HDFS_HA;
47    public static Chart HDFS_LOAD;
48    public static Chart NAMENODE_RPC_LATENCY;
49    public static Chart DATANODES;
50    public static Chart HBASE_MASTER_MEMORY;
51  
52    // Widget examples
53    public static Widget SYSTEM_LOAD_AVERAGE_WIDGET;
54    public static Widget WELCOME_PAGE_WIDGET;
55    public static Widget TRIAL_DOWNLOAD_WIDGET;
56    public static Widget CLUSTER_RUNNING_WIDGET;
57    public static Widget USER_WORKING_WIDGET;
58    public static Widget APP_RUNNING_WIDGET;
59    public static Widget TRIAL_ABANDON_RATE_WIDGET;
60    public static Widget CLUSTERS_HEALTH_WIDGET;
61    public static Widget TOP_ACTIVE_CLUSTERS_WIDGET;
62    public static Widget TOP_APP_WIDGET;
63    public static Widget APP_USAGE_WIDGET;
64    public static Widget QUICK_LINKS_WIDGET;
65    public static Widget LOG_SEARCH_WIDGET;
66    public static Widget YARN_APP_WIDGET;
67    public static Widget HDFS_WIDGET;
68    public static Widget HBASE_TABLE_WIDGET;
69    public static Widget TOP_USER_WIDGET;
70    public static Widget HDFS_HA_STATE_WIDGET;
71    public static Widget HDFS_LOAD_WIDGET;
72    public static Widget HDFS_NAMENODE_LATENCY_WIDGET;
73    public static Widget DATANODES_HEALTH_WIDGET;
74    public static Widget NODE_MANAGERS_HEALTH_WIDGET;
75    public static Widget HDFS_REMAINING_WIDGET;
76    public static Widget NAMENODE_MEMORY_WIDGET;
77    public static Widget RESOURCE_MANAGER_MEMORY_WIDGET;
78    public static Widget HBASE_MASTER_MOMORY_WIDGET;
79    public static Widget CPU_UTILIZATION_WIDGET;
80    public static Widget MEMORY_UTILIZATION_WIDGET;
81    public static Widget SWAP_UTILIZATION_WIDGET;
82    public static Widget DISK_UTILIZATION_WIDGET;
83    public static Widget NETWORK_UTILIZATION_WIDGET;
84    public static Widget CPU_HEAPMAP_WIDGET;
85    public static Widget HDFS_UI_WIDGET;
86    public static Widget HBASE_MASTER_UI_WIDGET;
87    public static List<Widget> WIDGET_LIST;
88    
89    public static Dashboard DEFAULT_DASHBOARD;
90    public static Dashboard USER_DASHBOARD;
91    public static Dashboard SYSTEM_DASHBOARD;
92    
93  
94    // series examples
95    public static Series CPU_METRICS;
96    
97    // SeriesMetaData examples
98    public static List<SeriesMetaData> CPU_SERIES_METADATA;
99    public static List<SeriesMetaData> HDFS_USAGE_SERIES_METADATA;
100 
101   static {
102     try {
103       final String hostname = InetAddress.getLocalHost().getHostName().toLowerCase();
104       final String[] metrics = { "SystemMetrics.LoadAverage.1" };
105       SYSTEM_LOAD_AVERAGE = Chart.createChart("1", "System Load Average", metrics, hostname, "");
106       final String[] cpuMetrics = { "SystemMetrics.cpu.combined", "SystemMetrics.cpu.sys", "SystemMetrics.cpu.user" };
107       CPU_UTILIZATION = Chart.createChart("2", "CPU Utilization", cpuMetrics, hostname, "percent");
108       final String[] memMetrics = { "SystemMetrics.memory.FreePercent", "SystemMetrics.memory.UsedPercent"};
109       MEMORY_UTILIZATION = Chart.createChart("3", "Memory Utilization", memMetrics, hostname, "percent");
110       final String[] diskMetrics = { "SystemMetrics.disk.ReadBytes", "SystemMetrics.disk.WriteBytes" };
111       DISK_UTILIZATION = Chart.createChart("4", "Disk Utilization", diskMetrics, hostname, "bytes-decimal");
112       final String[] netMetrics = { "SystemMetrics.network.TxBytes", "SystemMetrics.network.RxBytes" };
113       NETWORK_UTILIZATION = Chart.createChart("5", "Network Utilization", netMetrics, hostname, "bytes");
114       final String[] swapMetrics = { "SystemMetrics.swap.Total", "SystemMetrics.swap.Used", "SystemMetrics.swap.Free" };
115       SWAP_UTILIZATION = Chart.createChart("6", "Swap Utilization", swapMetrics, hostname, "bytes-decimal");
116 
117       // Namenode heap usage
118       StringBuilder namenode = new StringBuilder();
119       namenode.append(hostname);
120       namenode.append(":NameNode");
121       final String[] namenodeHeap = { "HadoopMetrics.jvm.JvmMetrics.MemHeapUsedM", "HadoopMetrics.jvm.JvmMetrics.MemHeapMaxM" };
122       NAMENODE_MEMORY = Chart.createCircle("7", "Namenode Memory", namenodeHeap, namenode.toString(), "%", "up");
123       
124       // HDFS Usage
125       final String[] hdfsUsage = { "HadoopMetrics.dfs.FSNamesystem.CapacityRemainingGB", "HadoopMetrics.dfs.FSNamesystem.CapacityTotalGB" };
126       HDFS_USAGE = Chart.createCircle("8", "HDFS Remaining", hdfsUsage, hostname, "%", "down");
127 
128       // Resource Manager Memory
129       StringBuilder rmnode = new StringBuilder();
130       rmnode.append(hostname);
131       rmnode.append(":ResourceManager");
132       final String[] rmHeap = { "HadoopMetrics.jvm.JvmMetrics.MemHeapUsedM", "HadoopMetrics.jvm.JvmMetrics.MemHeapMaxM" };
133       RESOURCE_MANAGER_MEMORY = Chart.createCircle("9", "Resource Manager Memory", rmHeap, rmnode.toString(), "%", "up");
134 
135       // Node Managers Health
136       final String[] nmh = { "HadoopMetrics.yarn.ClusterMetrics.NumActiveNMs", "HadoopMetrics.yarn.ClusterMetrics.NumLostNMs" };
137       NODE_MANAGER_HEALTH = Chart.createTile("10", "Node Managers Health", "Node Managers", "Active/Lost", nmh, hostname, "glyphicon-th");
138 
139       // High Availability State
140       final String[] ha = { "HadoopMetrics.dfs.FSNamesystem.HAState" };
141       HDFS_HA = Chart.createTile("11", "HDFS High Availability State", "HDFS High Availability", "", ha, hostname, "glyphicon-random");
142 
143       // HDFS Load
144       final String[] hdfsLoad = { "HadoopMetrics.dfs.FSNamesystem.TotalLoad" };
145       HDFS_LOAD = Chart.createTile("12", "HDFS Load Average", "HDFS Load", "", hdfsLoad, hostname, "glyphicon-signal");
146 
147       // Namenode RPC Latency
148       final String[] nnLatency = { "HadoopMetrics.rpc.rpc.RpcProcessingTimeAvgTime" };
149       NAMENODE_RPC_LATENCY = Chart.createTile("13", "NameNode Latency", "NameNode RPC Latency", "Milliseconds", nnLatency, hostname, "glyphicon-tasks");
150 
151       // Datanode Health
152       final String[] dnHealth = { "HadoopMetrics.dfs.FSNamesystem.StaleDataNodes" };
153       DATANODES = Chart.createTile("14", "Datanodes Health", "Datanodes", "Dead", dnHealth, hostname, "glyphicon-hdd");
154 
155       // HBase Master Memory
156       StringBuilder hbaseMaster = new StringBuilder();
157       hbaseMaster.append(hostname);
158       hbaseMaster.append(":Master");
159       final String[] hbm = { "HBaseMetrics.jvm.JvmMetrics.MemHeapUsedM", "HBaseMetrics.jvm.JvmMetrics.MemHeapMaxM" };
160       HBASE_MASTER_MEMORY = Chart.createCircle("15", "HBase Master Memory", hbm, hbaseMaster.toString(), "%", "up");
161 
162       CPU_SERIES_METADATA = CPU_UTILIZATION.getSeries();
163       HDFS_USAGE_SERIES_METADATA = HDFS_USAGE.getSeries();
164       
165 //      CPU_METRICS = new Series("SystemMetrics.LoadAverage.1");
166 //      CPU_METRICS.add(1234567890L, 0.0d);
167 //      CPU_METRICS.add(1234567891L, 1.0d);
168 //      CPU_METRICS.add(1234567892L, 2.0d);
169 //      CPU_METRICS.add(1234567893L, 3.0d);
170 
171       // Populate default widgets
172       Widget widget = new Widget();
173       widget.setTitle("System Load Average");
174       widget.setSrc(new URI("/hicc/v1/chart/draw/1"));
175       widget.setCol(1);
176       widget.setRow(1);
177       widget.setSize_x(2);
178       widget.setSize_y(1);
179       SYSTEM_LOAD_AVERAGE_WIDGET = widget;
180 
181       // Populate default dashboard
182       Dashboard dashboard = new Dashboard();
183 
184       widget = new Widget();
185       widget.setTitle("Welcome Page");
186       widget.setSrc(new URI("/hicc/welcome.html"));
187       widget.setCol(1);
188       widget.setRow(1);
189       widget.setSize_x(12);
190       widget.setSize_y(7);
191       WELCOME_PAGE_WIDGET = widget;
192       dashboard.add(WELCOME_PAGE_WIDGET);
193       DEFAULT_DASHBOARD = dashboard;
194 
195       widget = new Widget();
196       widget.setTitle("Trial Downloading");
197       widget.setSrc(new URI("/hicc/home/downloads.html"));
198       widget.setCol(1);
199       widget.setRow(1);
200       widget.setSize_x(2);
201       widget.setSize_y(1);
202       TRIAL_DOWNLOAD_WIDGET = widget;
203 
204       widget = new Widget();
205       widget.setTitle("Cluster Running");
206       widget.setSrc(new URI("/hicc/home/clusters.html"));
207       widget.setCol(3);
208       widget.setRow(1);
209       widget.setSize_x(2);
210       widget.setSize_y(1);
211       CLUSTER_RUNNING_WIDGET = widget;
212 
213       widget = new Widget();
214       widget.setTitle("Users Working");
215       widget.setSrc(new URI("/hicc/home/users.html"));
216       widget.setCol(5);
217       widget.setRow(1);
218       widget.setSize_x(2);
219       widget.setSize_y(1);
220       USER_WORKING_WIDGET = widget;
221 
222       widget = new Widget();
223       widget.setTitle("Applications Running");
224       widget.setSrc(new URI("/hicc/home/apps.html"));
225       widget.setCol(7);
226       widget.setRow(1);
227       widget.setSize_x(2);
228       widget.setSize_y(1);
229       APP_RUNNING_WIDGET = widget;
230 
231       widget = new Widget();
232       widget.setTitle("Trial Abandon Rate");
233       widget.setSrc(new URI("/hicc/v1/circles/draw/11"));
234       widget.setCol(1);
235       widget.setRow(2);
236       widget.setSize_x(2);
237       widget.setSize_y(2);
238       TRIAL_ABANDON_RATE_WIDGET = widget;
239 
240       widget = new Widget();
241       widget.setTitle("Clusters Health");
242       widget.setSrc(new URI("/hicc/v1/circles/draw/12"));
243       widget.setCol(3);
244       widget.setRow(2);
245       widget.setSize_x(2);
246       widget.setSize_y(2);
247       CLUSTERS_HEALTH_WIDGET = widget;
248 
249       widget = new Widget();
250       widget.setTitle("Top Active Clusters");
251       widget.setSrc(new URI("/hicc/clusters/"));
252       widget.setCol(5);
253       widget.setRow(2);
254       widget.setSize_x(2);
255       widget.setSize_y(2);
256       TOP_ACTIVE_CLUSTERS_WIDGET = widget;
257 
258       widget = new Widget();
259       widget.setTitle("Top Applications");
260       widget.setSrc(new URI("/hicc/apps/"));
261       widget.setCol(7);
262       widget.setRow(2);
263       widget.setSize_x(2);
264       widget.setSize_y(2);
265       TOP_APP_WIDGET = widget;
266 
267       widget = new Widget();
268       widget.setTitle("Applications Usage");
269       widget.setSrc(new URI("/hicc/apps/apps-usage.html"));
270       widget.setCol(7);
271       widget.setRow(2);
272       widget.setSize_x(2);
273       widget.setSize_y(2);
274       APP_USAGE_WIDGET = widget;
275 
276       // Populate user dashboards
277       dashboard = new Dashboard();
278 
279       widget = new Widget();
280       widget.setTitle("Quick Links");
281       widget.setSrc(new URI("/hicc/v1/dashboard/quicklinks"));
282       widget.setCol(1);
283       widget.setRow(1);
284       widget.setSize_x(12);
285       widget.setSize_y(7);
286       QUICK_LINKS_WIDGET = widget;
287       dashboard.add(QUICK_LINKS_WIDGET);
288 
289       // Log Search widget
290       widget = new Widget();
291       widget.setTitle("Log Search");
292       widget.setSrc(new URI("/hicc/ajax-solr/chukwa"));
293       widget.setCol(1);
294       widget.setRow(1);
295       widget.setSize_x(6);
296       widget.setSize_y(6);
297       LOG_SEARCH_WIDGET = widget;
298 
299       // Applications
300       widget = new Widget();
301       widget.setTitle("YARN Applications");
302       widget.setSrc(new URI("http://localhost:8088/"));
303       widget.setCol(1);
304       widget.setRow(7);
305       widget.setSize_x(6);
306       widget.setSize_y(6);
307       YARN_APP_WIDGET = widget;
308 
309       // Hadoop Distributed File System
310       widget = new Widget();
311       widget.setTitle("HDFS");
312       widget.setSrc(new URI("http://localhost:50070/explorer.html#/"));
313       widget.setCol(1);
314       widget.setRow(7);
315       widget.setSize_x(6);
316       widget.setSize_y(6);
317       HDFS_WIDGET = widget;
318 
319       // HBase Tables
320       widget = new Widget();
321       widget.setTitle("HBase Tables");
322       widget.setSrc(new URI("http://localhost:50654/tablesDetailed.jsp"));
323       widget.setCol(1);
324       widget.setRow(14);
325       widget.setSize_x(6);
326       widget.setSize_y(6);
327       HBASE_TABLE_WIDGET = widget;
328 
329       widget = new Widget();
330       widget.setTitle("Top Applications");
331       widget.setSrc(new URI("/hicc/apps/"));
332       widget.setCol(1);
333       widget.setRow(1);
334       widget.setSize_x(2);
335       widget.setSize_y(2);
336       TOP_APP_WIDGET = widget;
337 
338       widget = new Widget();
339       widget.setTitle("Top Users");
340       widget.setSrc(new URI("/hicc/users/"));
341       widget.setCol(1);
342       widget.setRow(3);
343       widget.setSize_x(2);
344       widget.setSize_y(2);
345       TOP_USER_WIDGET = widget;
346       USER_DASHBOARD = dashboard;
347 
348       // Populate system dashboards
349       dashboard = new Dashboard();
350       widget = new Widget();
351       widget.setTitle("HDFS High Availability State");
352       widget.setSrc(new URI("/hicc/v1/tile/draw/11"));
353       widget.setCol(1);
354       widget.setRow(1);
355       widget.setSize_x(2);
356       widget.setSize_y(1);
357       HDFS_HA_STATE_WIDGET = widget;
358       dashboard.add(HDFS_HA_STATE_WIDGET);
359 
360       widget = new Widget();
361       widget.setTitle("HDFS Load");
362       widget.setSrc(new URI("/hicc/v1/tile/draw/12"));
363       widget.setCol(3);
364       widget.setRow(1);
365       widget.setSize_x(2);
366       widget.setSize_y(1);
367       HDFS_LOAD_WIDGET = widget;
368       dashboard.add(HDFS_LOAD_WIDGET);
369 
370       widget = new Widget();
371       widget.setTitle("HDFS Namenode Latency");
372       widget.setSrc(new URI("/hicc/v1/tile/draw/13"));
373       widget.setCol(5);
374       widget.setRow(1);
375       widget.setSize_x(2);
376       widget.setSize_y(1);
377       HDFS_NAMENODE_LATENCY_WIDGET = widget;
378       dashboard.add(HDFS_NAMENODE_LATENCY_WIDGET);
379 
380       widget = new Widget();
381       widget.setTitle("Datanodes Health");
382       widget.setSrc(new URI("/hicc/v1/tile/draw/14"));
383       widget.setCol(7);
384       widget.setRow(1);
385       widget.setSize_x(2);
386       widget.setSize_y(1);
387       DATANODES_HEALTH_WIDGET = widget;
388       dashboard.add(DATANODES_HEALTH_WIDGET);
389       
390       widget = new Widget();
391       widget.setTitle("Node Managers Health");
392       widget.setSrc(new URI("/hicc/v1/tile/draw/10"));
393       widget.setCol(9);
394       widget.setRow(1);
395       widget.setSize_x(2);
396       widget.setSize_y(1);
397       NODE_MANAGERS_HEALTH_WIDGET = widget;
398       dashboard.add(NODE_MANAGERS_HEALTH_WIDGET);
399 
400       widget = new Widget();
401       widget.setTitle("HDFS Remaining");
402       widget.setSrc(new URI("/hicc/v1/circles/draw/8"));
403       widget.setCol(1);
404       widget.setRow(2);
405       widget.setSize_x(2);
406       widget.setSize_y(2);
407       HDFS_REMAINING_WIDGET = widget;
408       dashboard.add(HDFS_REMAINING_WIDGET);
409 
410       widget = new Widget();
411       widget.setTitle("Namenode Memory");
412       widget.setSrc(new URI("/hicc/v1/circles/draw/7"));
413       widget.setCol(3);
414       widget.setRow(2);
415       widget.setSize_x(2);
416       widget.setSize_y(2);
417       NAMENODE_MEMORY_WIDGET = widget;
418       dashboard.add(NAMENODE_MEMORY_WIDGET);
419 
420       widget = new Widget();
421       widget.setTitle("Resource Manager Memory");
422       widget.setSrc(new URI("/hicc/v1/circles/draw/9"));
423       widget.setCol(5);
424       widget.setRow(2);
425       widget.setSize_x(2);
426       widget.setSize_y(2);
427       RESOURCE_MANAGER_MEMORY_WIDGET = widget;
428       dashboard.add(RESOURCE_MANAGER_MEMORY_WIDGET);
429 
430       widget = new Widget();
431       widget.setTitle("HBase Master Memory");
432       widget.setSrc(new URI("/hicc/v1/circles/draw/15"));
433       widget.setCol(7);
434       widget.setRow(2);
435       widget.setSize_x(2);
436       widget.setSize_y(2);
437       HBASE_MASTER_MOMORY_WIDGET = widget;
438       dashboard.add(HBASE_MASTER_MOMORY_WIDGET);
439 
440       widget = new Widget();
441       widget.setTitle("System Load Average");
442       widget.setSrc(new URI("/hicc/v1/chart/draw/1"));
443       widget.setCol(9);
444       widget.setRow(2);
445       widget.setSize_x(2);
446       widget.setSize_y(1);
447       SYSTEM_LOAD_AVERAGE_WIDGET = widget;
448       dashboard.add(SYSTEM_LOAD_AVERAGE_WIDGET);
449 
450       widget = new Widget();
451       widget.setTitle("CPU Utilization");
452       widget.setSrc(new URI("/hicc/v1/chart/draw/2"));
453       widget.setCol(9);
454       widget.setRow(3);
455       widget.setSize_x(2);
456       widget.setSize_y(1);
457       CPU_UTILIZATION_WIDGET = widget;
458       dashboard.add(CPU_UTILIZATION_WIDGET);
459 
460       widget = new Widget();
461       widget.setTitle("Memory Utilization");
462       widget.setSrc(new URI("/hicc/v1/chart/draw/3"));
463       widget.setCol(9);
464       widget.setRow(4);
465       widget.setSize_x(2);
466       widget.setSize_y(1);
467       MEMORY_UTILIZATION_WIDGET = widget;
468       dashboard.add(MEMORY_UTILIZATION_WIDGET);
469 
470       widget = new Widget();
471       widget.setTitle("Swap Utilization");
472       widget.setSrc(new URI("/hicc/v1/chart/draw/6"));
473       widget.setCol(9);
474       widget.setRow(5);
475       widget.setSize_x(2);
476       widget.setSize_y(1);
477       SWAP_UTILIZATION_WIDGET = widget;
478       dashboard.add(SWAP_UTILIZATION_WIDGET);
479 
480       widget = new Widget();
481       widget.setTitle("Disk Utilization");
482       widget.setSrc(new URI("/hicc/v1/chart/draw/4"));
483       widget.setCol(1);
484       widget.setRow(4);
485       widget.setSize_x(4);
486       widget.setSize_y(2);
487       DISK_UTILIZATION_WIDGET = widget;
488       dashboard.add(DISK_UTILIZATION_WIDGET);
489 
490       widget = new Widget();
491       widget.setTitle("Network Utilization");
492       widget.setSrc(new URI("/hicc/v1/chart/draw/5"));
493       widget.setCol(5);
494       widget.setRow(4);
495       widget.setSize_x(4);
496       widget.setSize_y(2);
497       NETWORK_UTILIZATION_WIDGET = widget;
498       dashboard.add(NETWORK_UTILIZATION_WIDGET);
499       SYSTEM_DASHBOARD = dashboard;
500 
501       // CPU heatmap
502       widget = new Widget();
503       widget.setTitle("CPU Heatmap");
504       widget.setSrc(new URI("/hicc/v1/heatmap/render/SystemMetrics/cpu.combined."));
505       widget.setCol(1);
506       widget.setRow(5);
507       widget.setSize_x(6);
508       widget.setSize_y(5);
509       CPU_HEAPMAP_WIDGET = widget;
510 
511       // HDFS Namenode
512       widget = new Widget();
513       widget.setTitle("HDFS UI");
514       widget.setSrc(new URI("http://localhost:50070/"));
515       widget.setCol(1);
516       widget.setRow(11);
517       widget.setSize_x(6);
518       widget.setSize_y(6);
519       HDFS_UI_WIDGET = widget;
520 
521       // HBase Master
522       widget = new Widget();
523       widget.setTitle("HBase Master UI");
524       widget.setSrc(new URI("http://localhost:16010/"));
525       widget.setCol(1);
526       widget.setRow(18);
527       widget.setSize_x(6);
528       widget.setSize_y(6);
529       HBASE_MASTER_UI_WIDGET = widget;
530 
531       WIDGET_LIST = new ArrayList<Widget>();
532       WIDGET_LIST.add(HDFS_HA_STATE_WIDGET);
533       WIDGET_LIST.add(HDFS_UI_WIDGET);
534       WIDGET_LIST.add(HDFS_LOAD_WIDGET);
535     } catch (URISyntaxException e) {
536     } catch (UnknownHostException e) {
537     }
538   }
539 
540 }