[jira] [Assigned] (HIVE-17257) Hive should merge empty files

["Chao Sun (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-17257?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Chao Sun reassigned HIVE-17257:
-------------------------------


> Hive should merge empty files
> -----------------------------
>
>                 Key: HIVE-17257
>                 URL: https://issues.apache.org/jira/browse/HIVE-17257
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Chao Sun
>            Assignee: Chao Sun
>
> Currently if merging file option is turned on and the dest dir contains large number of empty files, Hive will not trigger merge task:
> {code}
>   private long getMergeSize(FileSystem inpFs, Path dirPath, long avgSize) {
>     AverageSize averageSize = getAverageSize(inpFs, dirPath);
>     if (averageSize.getTotalSize() <= 0) {
>       return -1;
>     }
>     if (averageSize.getNumFiles() <= 1) {
>       return -1;
>     }
>     if (averageSize.getTotalSize()/averageSize.getNumFiles() < avgSize) {
>       return averageSize.getTotalSize();
>     }
>     return -1;
>   }
> {code}
> This logic doesn't seem right as the it seems better to combine these empty files into one.



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