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Posted to dev@pig.apache.org by "Olga Natkovich (JIRA)" <ji...@apache.org> on 2008/12/08 20:56:46 UTC
[jira] Resolved: (PIG-546) FilterFunc calls empty constructor when
it should be calling parameterized constructor
[ https://issues.apache.org/jira/browse/PIG-546?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Olga Natkovich resolved PIG-546.
--------------------------------
Resolution: Fixed
patch committed. Thanks, Santhosh.
> FilterFunc calls empty constructor when it should be calling parameterized constructor
> --------------------------------------------------------------------------------------
>
> Key: PIG-546
> URL: https://issues.apache.org/jira/browse/PIG-546
> Project: Pig
> Issue Type: Bug
> Components: impl
> Affects Versions: types_branch
> Reporter: Viraj Bhat
> Fix For: types_branch
>
> Attachments: FILTERFROMFILE.java, insetfilterfile, mydata.txt, PIG-546.patch
>
>
> The following piece of Pig Script uses a custom UDF known as FILTERFROMFILE which extends the FilterFunc. It contains two constructors, an empty constructor which is mandatory and the parameterized constructor. The parameterized constructor passes the HDFS filename, which the exec function uses to construct a HashMap. The HashMap is later used for filtering records based on the match criteria in the HDFS file.
> {code}
> register util.jar;
> --util.jar contains the FILTERFROMFILE class
> define FILTER_CRITERION util.FILTERFROMFILE('/user/viraj/insetfilterfile');
> RAW_LOGS = load 'mydata.txt' as (url:chararray, numvisits:int);
> FILTERED_LOGS = filter RAW_LOGS by FILTER_CRITERION(numvisits);
> dump FILTERED_LOGS;
> {code}
> When you execute the above script, it results in a single Map only job with 1 Map. It seems that the empty constructor is called 5 times, and ultimately results in failure of the job.
> ===========================================
> parameterized constructor: /user/viraj/insetfilterfile
> parameterized constructor: /user/viraj/insetfilterfile
> empty constructor
> empty constructor
> empty constructor
> empty constructor
> empty constructor
> ===========================================
> Error in the Hadoop backend
> ===========================================
> java.lang.IllegalArgumentException: Can not create a Path from an empty string
> at org.apache.hadoop.fs.Path.checkPathArg(Path.java:82)
> at org.apache.hadoop.fs.Path.(Path.java:90)
> at org.apache.pig.backend.hadoop.datastorage.HDataStorage.isContainer(HDataStorage.java:199)
> at org.apache.pig.backend.hadoop.datastorage.HDataStorage.asElement(HDataStorage.java:130)
> at org.apache.pig.impl.io.FileLocalizer.openDFSFile(FileLocalizer.java:164)
> at util.FILTERFROMFILE.init(FILTERFROMFILE.java:70)
> at util.FILTERFROMFILE.exec(FILTERFROMFILE.java:89)
> at util.FILTERFROMFILE.exec(FILTERFROMFILE.java:52)
> at org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc.getNext(POUserFunc.java:179)
> at org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc.getNext(POUserFunc.java:217)
> at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POFilter.getNext(POFilter.java:148)
> at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.runPipeline(PigMapBase.java:170)
> at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.map(PigMapBase.java:158)
> at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapOnly$Map.map(PigMapOnly.java:65)
> at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:47)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:227)
> at org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:2209)
> ===========================================
> Attaching the sample data and the filter function UDF.
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