Differences
This shows you the differences between two versions of the page.
Both sides previous revision Previous revision Next revision | Previous revision | ||
courses:mapreduce-tutorial:if-things-go-wrong [2012/02/05 21:45] straka |
courses:mapreduce-tutorial:if-things-go-wrong [2012/02/06 13:55] (current) straka |
||
---|---|---|---|
Line 1: | Line 1: | ||
====== MapReduce Tutorial : If things go wrong ====== | ====== MapReduce Tutorial : If things go wrong ====== | ||
+ | |||
+ | A lot can go wrong in the process of creating cluster and submitting the Hadoop job: | ||
+ | * '' | ||
+ | * '' | ||
+ | * ''/ | ||
+ | |||
+ | If the cluster works, but your job crashes, you can: | ||
+ | * run the computation locally in single threaded mode (i.e., without specifying '' | ||
+ | * use the web interface to see Java exceptions / Perl return codes for each failed task attempt. | ||
+ | * use standard error output for log messages. You can access the stderr logs of all Hadoop tasks using the web interface. |