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Pig >> mail # user >> Unable to load data using PigStorage that was previously stored using PigStorage


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Jerry Lam 2013-04-17, 01:28
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Ruslan Al-Fakikh 2013-04-17, 15:57
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Jerry Lam 2013-04-17, 17:11
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Ruslan Al-Fakikh 2013-04-17, 17:22
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Ruslan Al-Fakikh 2013-04-17, 17:24
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Re: Unable to load data using PigStorage that was previously stored using PigStorage
Hi Rusian:

Thanks for your help. I really appreciate it. It really puzzled me.

I did a "describe B", the output is "B: {b: bytearray}".

I then tried to cast it as suggested, I got:
B = foreach A generate document#'b' as b:{};
describe B;
B: {b: {()}}

Then I proceed with:
C = foreach B generate flatten(b);

I got:
2013-04-17 13:38:04,601 [Thread-16] WARN
 org.apache.hadoop.mapred.LocalJobRunner - job_local_0002
java.lang.Exception: java.lang.ClassCastException:
org.apache.pig.data.DataByteArray cannot be cast to
org.apache.pig.data.DataBag
at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:400)
Caused by: java.lang.ClassCastException: org.apache.pig.data.DataByteArray
cannot be cast to org.apache.pig.data.DataBag
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POProject.processInputBag(POProject.java:586)
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POProject.getNext(POProject.java:250)
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.getNext(PhysicalOperator.java:334)
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.processPlan(POForEach.java:372)
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.getNext(POForEach.java:297)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapBase.runPipeline(PigGenericMapBase.java:283)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapBase.map(PigGenericMapBase.java:278)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapBase.map(PigGenericMapBase.java:64)
at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:144)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:725)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:332)
at
org.apache.hadoop.mapred.LocalJobRunner$Job$MapTaskRunnable.run(LocalJobRunner.java:232)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
at java.lang.Thread.run(Thread.java:680)

Best Regards,

Jerry
On Wed, Apr 17, 2013 at 1:24 PM, Ruslan Al-Fakikh <[EMAIL PROTECTED]>wrote:

> Hey, and as for converting a map of tuples, probably i got you wrong. If
> you can get to every value manually withing FOREACH then I see no problem
> in doing so.
>
>
> On Wed, Apr 17, 2013 at 9:22 PM, Ruslan Al-Fakikh <[EMAIL PROTECTED]
> >wrote:
>
> > I am not sure whether you can convert a map to a tuple.
> > But I am curious about one thing:
> > your are trying to use 'b' as a Bag, right? Because FLATTEN needs it to
> be
> > a Bag I guess:
> > http://pig.apache.org/docs/r0.10.0/basic.html#flatten
> > But it seems that Pig thinks that b is a byte array:
> > java.lang.ClassCastException: org.apache.pig.data.DataByteArray cannot be
> > cast to org.apache.pig.data.DataBag
> > Can you do this?:
> > DESCRIBE B
> >
> > I suppose it can look like a Bag in the output of DUMP, but I think Pig
> > doesn't know it is a Bag, maybe you'll need some kind of explicit cast?
> >
> >
> > On Wed, Apr 17, 2013 at 9:11 PM, Jerry Lam <[EMAIL PROTECTED]> wrote:
> >
> >> Hi Rusian,
> >>
> >> I tried to debug each step already but no luck.
> >> I did a dump (dump B;) after B = foreach A generate document#'b' as b;
> >> I got {([c#11,d#22]),([c#33,d#44])}
> >> but it fails when I did C = foreach B generate flatten(b);
> >>
> >> I don't have controls over the input. It is passed as Map of Maps. I
> guess
> >> it makes lookup easier using a map with keys.
> >>
> >> Can I convert map to tuple?
> >>
> >> Best Regards,
> >>
> >> Jerry
> >>
> >>
> >>
> >> On Wed, Apr 17, 2013 at 11:57 AM, Ruslan Al-Fakikh <
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Ruslan Al-Fakikh 2013-04-17, 19:26
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Jerry Lam 2013-04-17, 19:48
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Ruslan Al-Fakikh 2013-04-18, 02:52
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Jerry Lam 2013-04-18, 14:37
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Jerry Lam 2013-04-18, 14:43
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Prashant Kommireddi 2013-04-18, 16:34
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Jerry Lam 2013-04-18, 21:14
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Prashant Kommireddi 2013-04-18, 21:41
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Jerry Lam 2013-04-18, 22:57
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Ruslan Al-Fakikh 2013-04-19, 20:56
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Jerry Lam 2013-04-20, 00:39
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Prashant Kommireddi 2013-04-18, 06:56