地图减少作业卡在地图 0% 减少 0% [英] Map reduce job getting stuck at map 0% reduce 0%

问题描述

我正在运行著名的 wordcount 示例.我有一个本地和产品 hadoop 设置.相同的示例在 prod 中工作，但在本地不工作.有人可以告诉我我应该寻找什么.工作卡住了.任务日志是:

I am running the famous wordcount example. I have a local and prod hadoop setup. The same example is working in prod, but its not working locally. Can someone tell me what should I look for. The job is getting stuck. The task logs are:

~/tmp$ hadoop jar wordcount.jar WordCount /testhistory /outputtest/test
Warning: $HADOOP_HOME is deprecated.

13/08/29 16:12:34 WARN mapred.JobClient: Use GenericOptionsParser for parsing the arguments. Applications should implement Tool for the same.
13/08/29 16:12:35 INFO input.FileInputFormat: Total input paths to process : 3
13/08/29 16:12:35 INFO util.NativeCodeLoader: Loaded the native-hadoop library
13/08/29 16:12:35 WARN snappy.LoadSnappy: Snappy native library not loaded
13/08/29 16:12:35 INFO mapred.JobClient: Running job: job_201308291153_0015
13/08/29 16:12:36 INFO mapred.JobClient:  map 0% reduce 0%

本地hadoop以伪分布式模式运行.所有 3 个进程，namenode，datanode，jobtracker 都在运行.如果需要一些额外的信息，请告诉我.

Locally hadoop in running as pseudo distributed mode. All the 3 processes, namenode, datanode, jobtracker is running. Let me know if some extra information is required.

推荐答案

tasktracker好像不见了.

The tasktracker seems to be missing.

试试:

hadoop tasktracker &

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