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The following page has been changed by Amareshwari: http://wiki.apache.org/lucene-hadoop/HowToDebugMapReducePrograms ------------------------------------------------------------------------------ [http://lucene.apache.org/hadoop/api/org/apache/hadoop/filecache/DistributedCache.html#addCacheFile(java.net.URI,%20org.apache.hadoop.conf.Configuration) DistributedCache.addCacheFile(URI,conf)] and [http://lucene.apache.org/hadoop/api/org/apache/hadoop/filecache/DistributedCache.html#setCacheFiles DistributedCache.setCacheFiles(URIs,conf)] where URI is of the form "hdfs://host:port/<absolutepath>#<script-name>". For Streaming, the file can be added through command line option -cacheFile. + == Default Behavior == + + For Java programs: + Stdout, stderr are shown on job UI. Stack trace is printed on diagnostics. + + For Pipes: + Stdout, stderr are shown on the job UI. + Default gdb script is run which prints info abt threads: thread Id and function in which it was running when task failed. + And prints stack tarce where task has failed. + + For Streaming: + Stdout, stderr are shown on the Job UI. + The exception details are shown on task diagnostics. +
