600 秒内无法报告状态.杀戮！在 hadoop 中报告进度

问题描述

我收到以下错误:

Task attempt_201304161625_0028_m_000000_0 failed to report status for 600 seconds. Killing! 

我的地图工作.这个问题类似于 这个，这个，和 这个.但是，我不想在 hadoop 杀死不报告进度的任务之前增加默认时间，即，

for my Map jobs. This question is similar to this, this, and this. However, I do not want to increase the default time before hadoop kills a task that doesn't report progress, i.e.,

Configuration conf=new Configuration();
long milliSeconds = 1000*60*60;
conf.setLong("mapred.task.timeout", milliSeconds);

相反，我想使用 context.progress()、context.setStatus("Some Message") 或 context.getCounter(SOME_ENUM.PROGRESS).increment(1) 或类似的东西.但是，这仍然会导致作业被终止.这是我试图报告进度的代码片段.映射器:

Instead, I want to periodically report progress using either context.progress(), context.setStatus("Some Message") or context.getCounter(SOME_ENUM.PROGRESS).increment(1) or something similar. However, this still causes the job to be killed. Here are the snippets of code where I am attempting to report progress. The mapper:

protected void map(Key key, Value value, Context context) throws IOException, InterruptedException {

    //do some things
    Optimiser optimiser = new Optimiser();
    optimiser.optimiseFurther(<some parameters>, context);
    //more things
    context.write(newKey, newValue);
}

Optimiser 类中的 optimiseFurther 方法:

the optimiseFurther method within the Optimiser class:

public void optimiseFurther(<Some parameters>, TaskAttemptContext context) {

    int count = 0;
    while(something is true) {
        //optimise

        //try to report progress
        context.setStatus("Progressing:" + count);
        System.out.println("Optimise Progress:" + context.getStatus());
        context.progress();
        count++;
    }
}

映射器的输出显示状态正在更新:

The output from a mapper shows the status is being updated:

Optimise Progress:Progressing:0
Optimise Progress:Progressing:1
Optimise Progress:Progressing:2
...

但是，在默认时间后，作业仍会被终止.我是否以错误的方式使用上下文?为了成功报告进度，我还需要在工作设置中做些什么吗?

However, the job is still being killed after the default amount of time. Am I using the context in the wrong way? Is there anything else I need to do in the job setup in order to report the progress successfully?

推荐答案

这个问题与 中的一个错误有关Hadoop 0.20 不会向底层框架报告对 context.setStatus() 和 context.progress() 的调用(设置各种计数器的调用不会工作要么).有一个可用的补丁，所以更新到新版本的 Hadoop 应该可以解决这个问题.

This problem is to do with a bug in Hadoop 0.20 whereby calls to context.setStatus() and context.progress() are not being reported to the underlying framework (calls to set various counters are not working either). There is a patch available, so updating to a newer version of Hadoop should fix this.

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