NPE in TaskLog.java
-------------------

                 Key: HADOOP-2538
                 URL: https://issues.apache.org/jira/browse/HADOOP-2538
             Project: Hadoop
          Issue Type: Bug
          Components: mapred
    Affects Versions: 0.15.0
            Reporter: Michael Bieniosek


In the tasktracker web ui, if I go to

/tasklog?taskid=task_200801020752_0383_m_000000_0&all=true&plaintext=true

which corresponds to a short log (<4k), I get a 500 in the web ui, and this NPE 
in the tasktracker log:

2008-01-07 21:02:13,935 WARN /: /tasklog?taskid=task_200801020752_0383_m_000000_
0&all=true&plaintext=true: 
java.lang.NullPointerException
        at org.apache.hadoop.mapred.TaskLog.getTaskLogFile(TaskLog.java:48)
        at org.apache.hadoop.mapred.TaskLog$Reader.<init>(TaskLog.java:124)
        at org.apache.hadoop.mapred.TaskLogServlet.printTaskLog(TaskLogServlet.j
ava:44)
        at org.apache.hadoop.mapred.TaskLogServlet.doGet(TaskLogServlet.java:134
)


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