Run script in response to error occurrence

Question

Is there any way to run script (Pig, shell) in response to error occurrence? I mean: I create workflow in Oozie (Workflow Manager) and one of task fail and call error, and if this error occur i want to run specific script or another task. I want provide some kind of error handling:

• When error1 occur - do something
• When error2 occur - do somthing else

I will be gratefull for your help.

Answer 1

For Error handling you can use Decision nodes. For example:

<action name="Action1">
    <map-reduce>
        <job-tracker>foo:9001</job-tracker>
        <name-node>bar:9000</name-node>
        <job-xml>job1.xml</job-xml>
    </map-reduce>
    <ok to="NextAction"/>
    <error to="ErrorhandlingDecision"/>
</action>
<decision name="ErrorhandlingDecision">
    <switch>
        <case to="CorrectError1Node">
          ${wf:errorCode("SourceActionNodeName") eq "JA018"}
        </case>
        <case to="CorrectError2Node">
          ${errorMessage(wf:lastErrorNode()) eq "Error Msg Received"}
        </case>
        <default to="NextAction"/>
    </switch>
</decision>

All you need to catch the Error code or error message.

Note: Expression Lang (EL) support following operation

one of ["}", ".", ">", "gt", "<", "lt", "==", "eq", "<=", "le", ">=", "ge", "!=", "ne", "[", "+", "-", "*", "/", "div", "%", "mod", "and", "&&", "or", "||", "?"]

Hope this help.