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From "Johannes Zillmann (JIRA)" <j...@apache.org>
Subject [jira] Created: (PIG-125) improve exception handling and expressivness around tuple field access
Date Tue, 26 Feb 2008 22:40:54 GMT
improve exception handling and expressivness around tuple field access
----------------------------------------------------------------------

                 Key: PIG-125
                 URL: https://issues.apache.org/jira/browse/PIG-125
             Project: Pig
          Issue Type: Improvement
          Components: impl
            Reporter: Johannes Zillmann


Stumbled over the case that i'm accessing fields in a tuple which type are not as i expected.
The stack trace in one case looked as follow:

{noformat}
Exception in thread "main" java.lang.RuntimeException: execution failed
	at com.my.Executor.run(Executor.java:284)
Caused by: java.io.IOException: Unable to store alias C
	at org.apache.pig.impl.util.WrappedIOException.wrap(WrappedIOException.java:16)
	at org.apache.pig.PigServer.store(PigServer.java:335)
	at org.apache.pig.PigServer.store(PigServer.java:317)
	at com.carrieriq.m2m.platform.FlowExecutor.runMmp3(FlowExecutor.java:280)
	... 2 more
Caused by: org.apache.pig.backend.executionengine.ExecException
	at org.apache.pig.backend.local.executionengine.LocalExecutionEngine.execute(LocalExecutionEngine.java:137)
	at org.apache.pig.backend.local.executionengine.LocalExecutionEngine.execute(LocalExecutionEngine.java:32)
	at org.apache.pig.PigServer.store(PigServer.java:332)
	... 4 more
Caused by: java.io.IOException: Incompatible type for request getAtomField().
	at org.apache.pig.data.Tuple.getAtomField(Tuple.java:177)
	at com.carrieriq.m2m.platform.mmp3.DatabaseStoreFunc.putNext(DatabaseStoreFunc.java:83)
	at org.apache.pig.impl.io.PigFile.store(PigFile.java:64)
	at org.apache.pig.backend.local.executionengine.POStore.getNext(POStore.java:105)
	at org.apache.pig.backend.local.executionengine.LocalExecutionEngine.execute(LocalExecutionEngine.java:130)
	... 6 more
{noformat}

The exception message and the stacktrace gave me a clue what kind of problem i was facing.
But to know what exactly happened i needed to debug (or temporarily add some system-outs).
 
Looking at the code (of Tuple class) i think the exception-information can be improved easily
(add index and actual field type information) .
Also it seems that there is some space for simplifying the exception handling.

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