[jira] [Created] (FLINK-21778) Use heap memory instead of direct memory as index entry cache for sort-merge shuffle

[Shang Yuanchun (Jira)]

Yingjie Cao created FLINK-21778:
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             Summary: Use heap memory instead of direct memory as index entry cache for sort-merge shuffle
                 Key: FLINK-21778
                 URL: https://issues.apache.org/jira/browse/FLINK-21778
             Project: Flink
          Issue Type: Sub-task
          Components: Runtime / Network
    Affects Versions: 1.12.0
            Reporter: Yingjie Cao
             Fix For: 1.13.0


Currently, the sort-merge shuffle implementation uses a piece of direct memory as index entry cache for acceleration. We can use heap memory instead to reduce the usage of direct memory which further reduces the possibility of OutOfMemoryError.



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