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From "jay vyas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5902) JobHistoryServer (HistoryFileManager) needs more debug logs, fails to pick up jobs with % characters in the name.
Date Wed, 28 May 2014 16:04:02 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5902?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14011240#comment-14011240
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jay vyas commented on MAPREDUCE-5902:
-------------------------------------

Sure I can try those.  

In general what is the contract for a Hadoop file system- should it support any character
in a file name ? Are there certain escape sequences that have a particular meaning?

> JobHistoryServer (HistoryFileManager) needs more debug logs, fails to pick up jobs with
% characters in the name.
> -----------------------------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-5902
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5902
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: jobhistoryserver
>            Reporter: jay vyas
>   Original Estimate: 1h
>  Remaining Estimate: 1h
>
> 1) JobHistoryServer sometimes skips over certain history files, and ignores serving them
as completed.
> 2) In addition to skipping these files, the JobHistoryServer doesnt effectively log which
files are being skipped , and why.  
> So In addition to determining why certain types of files are skipped (file name length
doesnt appear to be the reason, rather, it appears to be that % characters throw the JobHistoryServer
filter off), we should log completed .jhist  files which  are available in the mr-history/tmp
directory, yet they are skipped for some reason. 
> *Regarding the actual bug : Skipping completed jhist files* 
> We will need an author of the JobHistoryServer, I think, to chime in on what types of
paths for jobs are actually valid.  It appears that at least some characters, if in a job
name, will make the jobhistoryserver skip recognition of a completed jhist file.
> *Regarding logging*
> It would be extremely useful , then, to have a couple of gaurded logs at this level of
the code, so that we can see, in the log folders, why files are being filtered out  , i.e.
it is due to filterint or visibility.
> {noformat}
>   private static List<FileStatus> scanDirectory(Path path, FileContext fc,
>       PathFilter pathFilter) throws IOException {
>     path = fc.makeQualified(path);
>     List<FileStatus> jhStatusList = new ArrayList<FileStatus>();
>     RemoteIterator<FileStatus> fileStatusIter = fc.listStatus(path);
>     while (fileStatusIter.hasNext()) {
>       FileStatus fileStatus = fileStatusIter.next();
>       Path filePath = fileStatus.getPath();
>       if (fileStatus.isFile() && pathFilter.accept(filePath)) {
>         jhStatusList.add(fileStatus);
>       }
>     }
>     return jhStatusList;
>   }
> {noformat}
> *Reproducing* 
> I was able to reproduce this bug by writing a custom mapreduce job with a job name, which
contained % characters.  I have also seen this with a version of the Mahout ParallelALSFactorizationJob,
which includes "-" characters in its name, which wind up getting replaced by "%2D" later on
at some stage in the job pipeline.



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