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  1. Sub-task FLINK-25960
    Distribute the data read buffers more fairly among result partitions for sort-shuffle
  2. Sub-task FLINK-25860
    Move read buffer allocation and output file creation to setup method for sort-shuffle result partition to avoid blocking main thread
  3. Sub-task FLINK-25796
    Avoid record copy for result partition of sort-shuffle if there are enough buffers for better performance
  4. Sub-task FLINK-25786
    Adjust the generation of subpartition data storage order for sort-shuffle from random shuffle to random shift
  5. Sub-task FLINK-25781
    Adjust the maximum number of buffers can be used per result partition for data read of sort-shuffle
  6. Sub-task FLINK-25780
    Reduce the maximum size of data output buffers per result partition for sort-shuffle
  7. Sub-task FLINK-25774
    Restrict the maximum number of buffers can be used per result partition for sort-shuffle
  8. Sub-task FLINK-25654
    Remove the redundant lock in SortMergeResultPartition
  9. Sub-task FLINK-25653
    Move buffer recycle in SortMergeSubpartitionReader out of lock to avoid deadlock
  10. Sub-task FLINK-24954
    Reset read buffer request timeout on buffer recycling for sort-shuffle
  11. Sub-task FLINK-21790
    Shuffle data directories to make directory selection of different TaskManagers fairer
  12. Sub-task FLINK-21789
    Make FileChannelManagerImpl#getNextPathNum select data directories fairly
  13. Sub-task FLINK-21788
    Throw PartitionNotFoundException if the partition file has been lost for blocking shuffle
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