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From "Viraj Bhat (JIRA)" <j...@apache.org>
Subject [jira] Updated: (PIG-619) Dumping empty results produces "Unable to get results for /tmp/temp-1964806069/tmp256878619 org.apache.pig.builtin.BinStorage" message
Date Tue, 13 Jan 2009 22:34:59 GMT

     [ https://issues.apache.org/jira/browse/PIG-619?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Viraj Bhat updated PIG-619:
---------------------------

    Attachment: mydata.txt

Test data

> Dumping empty results produces "Unable to get results for /tmp/temp-1964806069/tmp256878619
 org.apache.pig.builtin.BinStorage" message
> ---------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: PIG-619
>                 URL: https://issues.apache.org/jira/browse/PIG-619
>             Project: Pig
>          Issue Type: Bug
>          Components: impl
>    Affects Versions: types_branch
>         Environment: Hadoop 18, Multi-node hadoop installation
>            Reporter: Viraj Bhat
>             Fix For: types_branch
>
>         Attachments: mydata.txt, tmpfileload.pig
>
>
> Following pig script stores empty filter results into  'emptyfilteredlogs' HDFS dir.
It later reloads this data from an empty HDFS dir for additional grouping and counting. It
has been observed that this script, succeeds on a single node hadoop installation with the
following message as the alias COUNT_EMPTYFILTERED_LOGS contains empty data.
> ==============================================================================================================
> 2009-01-13 21:47:08,988 [main] INFO  org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher
- Success!
> ==============================================================================================================
> But on a multi-node Hadoop installation, the script fails with the following error:
> ==============================================================================================================
> 2009-01-13 13:48:34,602 [main] INFO  org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher
- Success!
> java.io.IOException: Unable to open iterator for alias: COUNT_EMPTYFILTERED_LOGS [Unable
to get results for /tmp/temp-1964806069/tmp256878619:org.apache.pig.builtin.BinStorage]
>         at org.apache.pig.backend.hadoop.executionengine.HJob.getResults(HJob.java:74)
>         at org.apache.pig.PigServer.openIterator(PigServer.java:408)
>         at org.apache.pig.tools.grunt.GruntParser.processDump(GruntParser.java:269)
>         at org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:178)
>         at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:84)
>         at org.apache.pig.tools.grunt.Grunt.exec(Grunt.java:64)
>         at org.apache.pig.Main.main(Main.java:306)
> Caused by: org.apache.pig.backend.executionengine.ExecException: Unable to get results
for /tmp/temp-1964806069/tmp256878619:org.apache.pig.builtin.BinStorage
>         ... 7 more
> Caused by: java.io.IOException: /tmp/temp-1964806069/tmp256878619 does not exist
>         at org.apache.pig.impl.io.FileLocalizer.openDFSFile(FileLocalizer.java:188)
>         at org.apache.pig.impl.io.FileLocalizer.open(FileLocalizer.java:291)
>         at org.apache.pig.backend.hadoop.executionengine.HJob.getResults(HJob.java:69)
>         ... 6 more
> ==============================================================================================================
> {code}
> RAW_LOGS = load 'mydata.txt' as (url:chararray, numvisits:int);
> RAW_LOGS = limit RAW_LOGS 2;
> FILTERED_LOGS = filter RAW_LOGS by numvisits < 0;
> store FILTERED_LOGS into 'emptyfilteredlogs' using PigStorage();
> EMPTY_FILTERED_LOGS = load 'emptyfilteredlogs' as (url:chararray, numvisits:int);
> GROUP_EMPTYFILTERED_LOGS = group EMPTY_FILTERED_LOGS by numvisits;
> COUNT_EMPTYFILTERED_LOGS = foreach GROUP_EMPTYFILTERED_LOGS generate
>                              group, COUNT(EMPTY_FILTERED_LOGS);
> explain COUNT_EMPTYFILTERED_LOGS;
> dump COUNT_EMPTYFILTERED_LOGS;
> {code}

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