Hyunsik Choi created TAJO-931:
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Summary: 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: Bug
Components: physical operator
Reporter: 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 is a block of this issue.
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