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https://issues.apache.org/jira/browse/PIG-949?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12755094#action_12755094
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Yan Zhou commented on PIG-949:
------------------------------
The problem is caused by not adding "ColumnMappingEntry"s from the key-split
specs in storage info to an explicitly specified MAP item in storage info,
thus causing missing CGs as needed by the key-split specs. Everything falls
apart thereafter. Will create a patch for R1 patch release soon.
> Zebra Bug: splitting map into multiple column group using storage hint causes
> unexpected behaviour
> --------------------------------------------------------------------------------------------------
>
> Key: PIG-949
> URL: https://issues.apache.org/jira/browse/PIG-949
> Project: Pig
> Issue Type: Bug
> Environment: linux
> Reporter: Alok Singh
>
> Hi
> The storage hint
> specification plays a important part whether the output table is readable or
> not
> say if we have have the map 'map'.
> One can split the map into a column group using [map#{k1}, map#{k2}...]
> however the remaining map field will automatically be added to the default
> group.
> if user try to create a new column group for the remaining fields as follows
> [map#{k1}, map#{k2}, ..][map] i.e create a seperate column group
> the table writer will create the table.
> however, if one tries to load the created table via pig or via map reduce
> using TableInputFormat
>
> then the reader have problem reading the map
> We get the following stack trace
> 09/09/09 00:09:45 INFO mapred.JobClient: Task Id :
> attempt_200908191538_33939_m_000021_2, Status : FAILED
> java.io.IOException: getValue() failed: null
> at
> org.apache.hadoop.zebra.io.BasicTable$Reader$BTScanner.getValue(BasicTable.java:775)
> at
> org.apache.hadoop.zebra.mapred.TableRecordReader.next(TableInputFormat.java:717)
> at
> org.apache.hadoop.zebra.mapred.TableRecordReader.next(TableInputFormat.java:651)
> at
> org.apache.hadoop.mapred.MapTask$TrackedRecordReader.moveToNext(MapTask.java:191)
> at
> org.apache.hadoop.mapred.MapTask$TrackedRecordReader.next(MapTask.java:175)
> at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:48)
> at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:356)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:305)
> at org.apache.hadoop.mapred.Child.main(Child.java:170)
> Alok
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