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https://issues.apache.org/jira/browse/HADOOP-3705?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12625554#action_12625554
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Edward J. Yoon commented on HADOOP-3705:
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Looks good for me. +1 to new patch.
> CompositeInputFormat is unable to parse InputFormat classes with names
> containing '_' or '$'
> --------------------------------------------------------------------------------------------
>
> Key: HADOOP-3705
> URL: https://issues.apache.org/jira/browse/HADOOP-3705
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.17.0
> Reporter: Jingkei Ly
> Fix For: 0.19.0
>
> Attachments: 3705-0.patch, HADOOP-3705.patch
>
>
> If I try to set "mapred.join.expr" with my own InputFormat class that
> contains a '_' character (or if my InputFormat class is a static inner
> class), I get the following exception thrown when I run my MapReduce job:
> Exception in thread "main" java.io.IOException: Unexpected: 95
> at org.apache.hadoop.mapred.join.Parser$Lexer.next(Parser.java:161)
> at org.apache.hadoop.mapred.join.Parser.parse(Parser.java:479)
> at
> org.apache.hadoop.mapred.join.CompositeInputFormat.setFormat(CompositeInputFormat.java:77)
> at
> org.apache.hadoop.mapred.join.CompositeInputFormat.validateInput(CompositeInputFormat.java:118)
> at org.apache.hadoop.mapred.JobClient.submitJob(JobClient.java:705)
> at org.apache.hadoop.mapred.JobClient.runJob(JobClient.java:973)
> If the class contains '$' the exception reads Unexpected: 95.
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