Hadoop JobClient can return specific exit codes for specific classes of
exceptions
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Key: HADOOP-2856
URL: https://issues.apache.org/jira/browse/HADOOP-2856
Project: Hadoop Core
Issue Type: Improvement
Components: mapred
Affects Versions: 0.16.0
Reporter: Hemanth Yamijala
Today if a job tracker becomes unresponsive or dies, the hadoop JobClient
throws an exception subclass of IOException and exits with an exit code of 1.
However, it would probably fail with the same exit code if there's any other
type of exception as well. Programs like HOD which use this client (indirectly
through the hadoop script) can make better decisions if the error code is more
distinguishable. For e.g. if it's a network related exception, we can treat the
cluster are unusable, or retry after awhile etc. More generically, if
categories of exceptions can be treated with specific exit codes, it will help.
Comments ?
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