Yu Li created FLINK-12699:
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Summary: Reduce CPU consumption when snapshot/restore the spilled
key-group
Key: FLINK-12699
URL: https://issues.apache.org/jira/browse/FLINK-12699
Project: Flink
Issue Type: Sub-task
Components: Runtime / State Backends
Reporter: Yu Li
Assignee: Yu Li
We need to prevent the unnecessary de/serialization when snapshotting/restoring
the spilled state key-group. To achieve this, we need to:
1. Add meta information for {{HeapKeyedStatebackend}} checkpoint on DFS,
separating the on-heap and on-disk part
2. Write the off-heap bytes directly to DFS when checkpointing and mark it as
on-disk
3. Directly write the bytes onto disk when restoring the data back from DFS, if
it's marked as on-disk
Notice that we cannot directly use file copy since we use mmap meanwhile
support copy-on-write.
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