I am trying to collect various metrics for active tasttrackers but it
throws an exception
Not sure why?
<snippet>
for(String s: jc.getClusterStatus(true).getActiveTrackerNames()){
System.out.println("tt "+s);
System.out.println(""+ new
org.apache.hadoop.mapreduce.server.jobtracker.TaskTracker(s).getAvailableSlots(TaskType.MAP));
}
<snippet>
#output
prompt $ /installs/hadoop-0.20.2//bin/hadoop jar tools.jar tools.MetaInfo
tt tracker_10.0.0.6:localhost/127.0.0.1:53256java.lang.NullPointerException
at
org.apache.hadoop.mapreduce.server.jobtracker.TaskTracker.getAvailableSlots(TaskTracker.java:90)
at tools.MetaInfo.<init>(MetaInfo.java:44) at
tools.MetaInfo.main(MetaInfo.java:51) at
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597) at
org.apache.hadoop.util.RunJar.main(RunJar.java:186) jabir:CompareHdfs
jabir.ahmed$
Not sure why it doesnt display the available slots but displays an error
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