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https://issues.apache.org/jira/browse/TAJO-989?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14084319#comment-14084319
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ASF GitHub Bot commented on TAJO-989:
-------------------------------------

Github user hyunsik commented on a diff in the pull request:

    https://github.com/apache/tajo/pull/103#discussion_r15741073
  
    --- Diff: tajo-core/src/main/java/org/apache/tajo/worker/Task.java ---
    @@ -27,6 +27,7 @@
     import org.apache.hadoop.conf.Configuration;
     import org.apache.hadoop.fs.*;
     import org.apache.hadoop.util.ReflectionUtils;
    +import org.apache.tajo.ExecutionBlockId;
    --- End diff --
    
    It's an unused import.


> Cleanup of child blocks after parent execution block is complete
> ----------------------------------------------------------------
>
>                 Key: TAJO-989
>                 URL: https://issues.apache.org/jira/browse/TAJO-989
>             Project: Tajo
>          Issue Type: Improvement
>          Components: worker
>    Affects Versions: 0.9.0
>            Reporter: Jinho Kim
>            Assignee: Jinho Kim
>
> Child execution block working directory is not deleted until the query is 
> complete. there are too many files in directory. we should delete the child 
> execution block



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