MAPREDUCE-3487. Fixed JobHistory web-UI to display links to single task's counters' page. Contributed by Jason Lowe.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1215016 13f79535-47bb-0310-9956-ffa450edef68

hadoop-mapreduce-project/CHANGES.txt

@@ -314,6 +314,9 @@ Release 0.23.1 - Unreleased
     MAPREDUCE-3560. TestRMNodeTransitions is failing on trunk. 
     (Siddharth Seth via mahadev)
 
+    MAPREDUCE-3487. Fixed JobHistory web-UI to display links to single task's
+    counters' page. (Jason Lowe via vinodkv)
+
 Release 0.23.0 - 2011-11-01 
 
   INCOMPATIBLE CHANGES

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/webapp/CountersBlock.java

@@ -120,7 +120,7 @@ public class CountersBlock extends HtmlBlock {
         // Ditto
         TR<TBODY<TABLE<TD<TR<TBODY<TABLE<DIV<Hamlet>>>>>>>> groupRow = group.
           tr();
-          if (mg == null && rg == null) {
+          if (task == null && mg == null && rg == null) {
             groupRow.td().$title(counter.getName())._(counter.getDisplayName()).
             _();
           } else {

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/webapp/SingleCounterBlock.java

@@ -24,6 +24,7 @@ import java.util.TreeMap;
 
 import org.apache.hadoop.mapreduce.v2.api.records.Counter;
 import org.apache.hadoop.mapreduce.v2.api.records.CounterGroup;
+import org.apache.hadoop.mapreduce.v2.api.records.Counters;
 import org.apache.hadoop.mapreduce.v2.api.records.JobId;
 import org.apache.hadoop.mapreduce.v2.api.records.TaskAttemptId;
 import org.apache.hadoop.mapreduce.v2.api.records.TaskId;
@@ -120,8 +121,9 @@ public class SingleCounterBlock extends HtmlBlock {
       for(Map.Entry<TaskAttemptId, TaskAttempt> entry : 
         task.getAttempts().entrySet()) {
         long value = 0;
-        CounterGroup group = entry.getValue().getCounters()
-        .getCounterGroup($(COUNTER_GROUP));
+        Counters counters = entry.getValue().getCounters();
+        CounterGroup group = (counters != null)
+        		? counters.getCounterGroup($(COUNTER_GROUP)) : null;
         if(group != null)  {
           Counter c = group.getCounter($(COUNTER_NAME));
           if(c != null) {

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/test/java/org/apache/hadoop/mapreduce/v2/app/webapp/TestAMWebApp.java

@@ -31,6 +31,7 @@ import org.apache.hadoop.mapreduce.v2.app.AppContext;
 import org.apache.hadoop.mapreduce.v2.app.MockJobs;
 import org.apache.hadoop.mapreduce.v2.app.job.Job;
 import org.apache.hadoop.mapreduce.v2.app.job.Task;
+import org.apache.hadoop.mapreduce.v2.app.job.TaskAttempt;
 import org.apache.hadoop.mapreduce.v2.util.MRApps;
 import org.apache.hadoop.yarn.Clock;
 import org.apache.hadoop.yarn.api.records.ApplicationAttemptId;
@@ -153,7 +154,7 @@ public class TestAMWebApp {
     e.getValue().getType();
     Map<String, String> params = new HashMap<String, String>();
     params.put(AMParams.JOB_ID, MRApps.toString(jobId));
-    params.put(AMParams.TASK_ID, e.getKey().toString());
+    params.put(AMParams.TASK_ID, MRApps.toString(e.getKey()));
     params.put(AMParams.TASK_TYPE, MRApps.taskSymbol(e.getValue().getType()));
     return params;
   }
@@ -179,6 +180,32 @@ public class TestAMWebApp {
     WebAppTests.testPage(SingleCounterPage.class, AppContext.class,
                          appContext, params);
   }
+
+  @Test public void testTaskCountersView() {
+    AppContext appContext = new TestAppContext();
+    Map<String, String> params = getTaskParams(appContext);
+    WebAppTests.testPage(CountersPage.class, AppContext.class,
+                         appContext, params);
+  }
+
+  @Test public void testSingleTaskCounterView() {
+    AppContext appContext = new TestAppContext(0, 1, 1, 2);
+    Map<String, String> params = getTaskParams(appContext);
+    params.put(AMParams.COUNTER_GROUP, 
+        "org.apache.hadoop.mapreduce.FileSystemCounter");
+    params.put(AMParams.COUNTER_NAME, "HDFS_WRITE_OPS");
+    
+    // remove counters from one task attempt
+    // to test handling of missing counters
+    TaskId taskID = MRApps.toTaskID(params.get(AMParams.TASK_ID));
+    Job job = appContext.getJob(taskID.getJobId());
+    Task task = job.getTask(taskID);
+    TaskAttempt attempt = task.getAttempts().values().iterator().next();
+    attempt.getReport().setCounters(null);
+    
+    WebAppTests.testPage(SingleCounterPage.class, AppContext.class,
+                         appContext, params);
+  }
   
   public static void main(String[] args) {
     WebApps.$for("yarn", AppContext.class, new TestAppContext(0, 8, 88, 4)).