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USraven_arkadon
 

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    1. POComputing set intersection and set difference of the records of two files with hadoop
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    1. POhibernate c3p0 broken pipe
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    2. PO
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    3. POComputing set intersection and set difference of the records of two files with hadoop
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    1. This table or related slice is empty.
    1. COIf I understand correctly, you can only programmatically create servlets during initialization of the context - i.e. NOT as a side effect of a (HTTP) request: According to [ServletContext.addServlet(...)](http://docs.oracle.com/javaee/6/api/javax/servlet/ServletContext.html#addServlet%28java.lang.String,%20java.lang.Class%29): IllegalStateException - if this ServletContext has already been initialized
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    2. COSry for the late response; Is it possible, that my idea cannot work: The source file is split up and the splits are sent to the nodes. The nodes then read the records from their corresponding split. So duplicate records in the source file may be located in several splits and therefore become spread across several nodes. Therefore getting a grouping of the duplicates is only possible in the reducer. Is this correct?
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    3. COHi, I was a bit unclear: The point is, that I want the combiners to only hand the summary (the number of lines in 1, 2, and common) to the reducer - there is no need that all lines are sent back to the reducer. But for this to work, the combiners must see the records of both files together (my RecordReader already produces (line, fileId) pairs; the mapping from filename to fileId is passed around with the config object). However, when adding the files with two FileInputFormat.addInputPath(job, file) statements, the files get processed individually, so the combiners do not see their 'union'.
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