node health check script does not display the correct message on timeout
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                 Key: MAPREDUCE-709
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-709
             Project: Hadoop Map/Reduce
          Issue Type: Bug
    Affects Versions: 0.21.0
            Reporter: Ramya R
            Priority: Minor
             Fix For: 0.21.0


When the node health check script takes more than 
"mapred.healthChecker.script.timeout" to return, it should display a timeout 
message. Instead it displays the full stacktrace as below:

{noformat}
java.io.IOException: Stream closed at 
java.io.BufferedInputStream.getBufIfOpen(BufferedInputStream.java:145) 
at java.io.BufferedInputStream.read(BufferedInputStream.java:308) 
at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:264) 
at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:306) 
at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:158) 
at java.io.InputStreamReader.read(InputStreamReader.java:167) 
at java.io.BufferedReader.fill(BufferedReader.java:136) 
at java.io.BufferedReader.readLine(BufferedReader.java:299) 
at java.io.BufferedReader.readLine(BufferedReader.java:362) 
at org.apache.hadoop.util.Shell.runCommand(Shell.java:202) 
at org.apache.hadoop.util.Shell.run(Shell.java:145) 
at org.apache.hadoop.util.Shell$ShellCommandExecutor.execute(Shell.java:338) 
at 
org.apache.hadoop.mapred.NodeHealthCheckerService$NodeHealthMonitorExecutor.run(NodeHealthCheckerService.java:119)
 
at java.util.TimerThread.mainLoop(Timer.java:512) 
at java.util.TimerThread.run(Timer.java:462) 
{noformat}

Also the "mapred.healthChecker.script.timeout" is not being reflected in the 
job.xml. It always picks up the default value. It is just an UI issue.

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