Example usage for org.apache.hadoop.mapreduce Job getTaskCompletionEvents

Introduction

In this page you can find the example usage for org.apache.hadoop.mapreduce Job getTaskCompletionEvents.

Prototype

public TaskCompletionEvent[] getTaskCompletionEvents(final int startFrom, final int numEvents)
        throws IOException, InterruptedException 

Source Link

Document

Get events indicating completion (success/failure) of component tasks.

Usage

From source file:org.apache.druid.indexer.Utils.java

License:Apache License

public static String getFailureMessage(Job failedJob, ObjectMapper jsonMapper) {
    try {/*from   w  ww  .j av  a2 s  .co  m*/
        Map<String, String> taskDiagsMap = new HashMap<>();
        TaskCompletionEvent[] completionEvents = failedJob.getTaskCompletionEvents(0, 100);
        for (TaskCompletionEvent tce : completionEvents) {
            String[] taskDiags = failedJob.getTaskDiagnostics(tce.getTaskAttemptId());
            String combinedTaskDiags = "";
            for (String taskDiag : taskDiags) {
                combinedTaskDiags += taskDiag;
            }
            taskDiagsMap.put(tce.getTaskAttemptId().toString(), combinedTaskDiags);
        }
        return jsonMapper.writeValueAsString(taskDiagsMap);
    } catch (IOException | InterruptedException ie) {
        log.error(ie, "couldn't get failure cause for job [%s]", failedJob.getJobName());
        return null;
    }
}

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