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https://issues.apache.org/jira/browse/FLINK-11857?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kurt Young closed FLINK-11857.
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Resolution: Implemented
Fix Version/s: 1.9.0
fixed in 2819e6c230f3e57097f15c250fb01c3155168396
> Introduce BinaryExternalSorter and BufferedKVExternalSorter to batch table
> runtime
> ----------------------------------------------------------------------------------
>
> Key: FLINK-11857
> URL: https://issues.apache.org/jira/browse/FLINK-11857
> Project: Flink
> Issue Type: New Feature
> Components: Runtime / Operators
> Reporter: Jingsong Lee
> Assignee: Jingsong Lee
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.9.0
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> We need a sorter to take full advantage of the high performance of the Binary
> format.
> For Sort, Sort Aggregation, SortMergeJoin: we need a BinaryExternalSorter to
> sort BinaryRows.
> For Hash Aggregation：We store the data in HashMap in KeyValue format. When
> memory is not enough, we spill all the data in memory onto disk and
> degenerate it into Sort Aggregation. So we need a BufferedKVExternalSorter to
> write the data that already in memory to disk, and then carry out Sort Merge.
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