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https://issues.apache.org/jira/browse/TAJO-1343?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jihoon Son resolved TAJO-1343.
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Resolution: Fixed
Committed to master
> 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
> Assignee: Jihoon Son
> Priority: Critical
> Fix For: 0.11.0
>
> Attachments: 1343-memory.png, master-memory.png
>
>
> *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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