[jira] [Resolved] (TAJO-931) Output file can be punctuated depending on the file size.

["Hyunsik Choi (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TAJO-931?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hyunsik Choi resolved TAJO-931.
-------------------------------

    Resolution: Fixed

committed it to master branch.

> Output file can be punctuated depending on the file size.
> ---------------------------------------------------------
>
>                 Key: TAJO-931
>                 URL: https://issues.apache.org/jira/browse/TAJO-931
>             Project: Tajo
>          Issue Type: Improvement
>          Components: physical operator
>            Reporter: Hyunsik Choi
>            Assignee: Hyunsik Choi
>             Fix For: 0.9.0
>
>
> There are some file formats (e.g., Parquet) which are not splittable. They can usually span multiple HDFS blocks if one file is very large. It causes remote HDFS access and limits the parallel degree, resulting in significant performance degradation.
> We can solve this problem if StoreTableExec or {Col|SortBased}PartitionStoreExec can punctuate the final output file according to the written size.
> In addition, we need to support a session variable to determine the per file size of final output files. So, TAJO-928 blocks this issue.



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