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From "Johan Oskarsson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4640) Add ability to split text files compressed with lzo
Date Thu, 20 Nov 2008 15:26:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4640?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12649392#action_12649392
] 

Johan Oskarsson commented on HADOOP-4640:
-----------------------------------------

Local test-patch gives one findbugs error as expected (synchronization). All unit tests pass.
There is a hudson run queued up for the previous version of the patch, not sure how to cancel
that.

     [exec] -1 overall.                                                                  
                                                                                         
                            
     [exec]                                                                              
                                                                                         
                            
     [exec]     +1 @author.  The patch does not contain any @author tags.                
                                                                                         
                            
     [exec]                                                                              
                                                                                         
                            
     [exec]     +1 tests included.  The patch appears to include 3 new or modified tests.
                                                                                         
                            
     [exec]                                                                              
                                                                                         
                            
     [exec]     +1 javadoc.  The javadoc tool did not generate any warning messages.     
                                                                                         
                            
     [exec]                                                                              
                                                                                         
                            
     [exec]     +1 javac.  The applied patch does not increase the total number of javac compiler
warnings.                                                                                
                    
     [exec]                                                                              
                                                                                         
                            
     [exec]     -1 findbugs.  The patch appears to introduce 1 new Findbugs warnings.    
                                                                                         
                            
     [exec]                                                                              
                                                                                         
                            
     [exec]     +1 Eclipse classpath. The patch retains Eclipse classpath integrity.     
                                                                                         
                            
     [exec]                        


> Add ability to split text files compressed with lzo
> ---------------------------------------------------
>
>                 Key: HADOOP-4640
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4640
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: io, mapred
>            Reporter: Johan Oskarsson
>            Assignee: Johan Oskarsson
>            Priority: Trivial
>             Fix For: 0.20.0
>
>         Attachments: HADOOP-4640.patch, HADOOP-4640.patch, HADOOP-4640.patch, HADOOP-4640.patch
>
>
> Right now any file compressed with lzop will be processed by one mapper. This is a shame
since the lzo algorithm would be very suitable for large log files and similar common hadoop
data sets. The compression rate is not the best out there but the decompression speed is amazing.
 Since lzo writes compressed data in blocks it would be possible to make an input format that
can split the files.

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