Jihoon Son created TAJO-1343:
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Summary: Improve the memory usage of physical executors
Key: TAJO-1343
URL: https://issues.apache.org/jira/browse/TAJO-1343
Project: Tajo
Issue Type: Improvement
Components: physical operator
Reporter: Jihoon Son
Priority: Critical
Fix For: 0.10
*Introduction*
Basically, the tuple instance is maintained as a singleton in physical
operators. However, there are some memory-based operator types which need to
keep multiple tuples in the memory. In these operators, multiple instances must
be created for each tuple.
*Problem*
Currently, there are some temporal routines to avoid unexpected problems due to
the singleton instance of tuple. However, the methodology is inconsistent and
complex, which causes unexpected bugs.
*Solution*
A consistent methodology is needed to handle this problem. Only the operators
that keep multiple tuples in memory must maintain those tuples with separate
instances.
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