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Date: Tue, 18 May 2010 01:20:43 -0400 (EDT)
From: "Konstantin Boudnik (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
Subject: [jira] Commented: (MAPREDUCE-1793) Exception exculsion
 functionality is not working correctly.
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-1793?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12868535#action_12868535 ] 

Konstantin Boudnik commented on MAPREDUCE-1793:
-----------------------------------------------

oops, you are right. I have misread the proposed fix. Sorry. I guess this is the absence of a patch to blame ;-)


> Exception exculsion functionality is not working correctly.
> -----------------------------------------------------------
>
>                 Key: MAPREDUCE-1793
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1793
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: test
>            Reporter: Vinay Kumar Thota
>            Assignee: Balaji Rajagopalan
>
> Exception exclusion functionality is not working correctly because of that tests are failing by not matching the error count.
> I debugged the issue and found that the problem with shell command which is generating in the getNumberOfMatchesInLogFile function.
> Currently building the shell command in the following way. 
> if(list != null){
>   for(int i =0; i < list.length; ++i)
>   {
>     filePattern.append(" | grep -v " + list[i] );
>   }
> }
>     String[] cmd =
>         new String[] {
>             "bash",
>             "-c",
>             "grep -c "
>                 + pattern + " " + filePattern
>                 + " | awk -F: '{s+=$2} END {print s}'" };    
> However, The above commnad won't work correctly because you are counting the exceptions in the file before excluding the known exceptions.
> In this case it gives the mismatch error counts everytime.The shell command should be in the following way to work correctly.
> if (list != null) {
>   int index = 0;
>   for (String excludeExp : list) {
>     filePattern.append((++index < list.length)? "| grep -v " : 
>             "| grep -vc " + list[i] );  
>   }
> }
> String[] cmd =
>    new String[] {
>        "bash",
>        "-c",
>        "grep "
>            + pattern + " " + filePattern
>            + " | awk -F: '{s+=$2} END {print s}'" };  

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