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我正在處理8節點Hadoop集羣,並且嘗試使用指定的配置執行簡單的流式作業。在多節點Hadoop集羣上執行流作業中的「子錯誤」(cloudera distribution CDH3u0 Hadoop 0.20.2)
hadoop jar /usr/lib/hadoop-0.20/contrib/streaming/hadoop-streaming-0.20.2-cdh3u0.jar \-D mapred.map.max.tacker.failures=10 \-D mared.map.max.attempts=8 \-D mapred.skip.attempts.to.start.skipping=8 \-D mapred.skip.map.max.skip.records=8 \-D mapred.skip.mode.enabled=true \-D mapred.max.map.failures.percent=5 \-input /user/hdfs/ABC/ \-output "/user/hdfs/output1/" \-mapper "perl -e 'while (<>) { chomp; print; }; exit;" \-reducer "perl -e 'while (<>) { ~s/LR\>/LR\>\n/g; print ; }; exit;"
我使用cloudera的hadoop CDH3u0分佈與hadoop 0.20.2。執行這項工作的問題是每次工作都失敗。這項工作是給錯誤:
java.lang.Throwable: Child Error
at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:242)
Caused by: java.io.IOException: Task process exit with nonzero status of 1.
at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:229)
-------
java.lang.Throwable: Child Error
at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:242)
Caused by: java.io.IOException: Task process exit with nonzero status of 1.
at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:229)
STDERR on the datanodes:
Exception in thread "main" java.io.IOException: Exception reading file:/mnt/hdfs/06/local/taskTracker/hdfs/jobcache/job_201107141446_0001/jobToken
at org.apache.hadoop.security.Credentials.readTokenStorageFile(Credentials.java:146)
at org.apache.hadoop.mapreduce.security.TokenCache.loadTokens(TokenCache.java:159)
at org.apache.hadoop.mapred.Child.main(Child.java:107)
Caused by: java.io.FileNotFoundException: File file:/mnt/hdfs/06/local/taskTracker/hdfs/jobcache/job_201107141446_0001/jobToken does not exist.
因爲我已經檢查了以下幾點錯誤的原因,仍然導致崩潰對此我無法理解的原因。
1. All the temp directories are in place
2. Memory is way more than it might be required for job (running a small job)
3. Permissions verified.
4. Nothing Fancier done in the configuration just usual stuff.
最奇怪的是,某個時候作業成功運行,大部分時間都失敗。有關這些問題的任何指導/幫助將非常有幫助。我從過去4天開始處理這個錯誤,我無法弄清楚任何事情。請幫忙!!!
感謝&問候, 阿圖爾
運行mapreduce時檢查磁盤空間是否用完。記錄目錄相關的磁盤空間 – Infinity