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  1. Sub-task HDFS-6750
    The DataNode should use its shared memory segment to mark short-circuit replicas that have been unlinked as stale
  2. Sub-task HDFS-6086
    Fix a case where zero-copy or no-checksum reads were not allowed even when the block was cached
  3. Sub-task HDFS-6061
    Allow dfs.datanode.shared.file.descriptor.path to contain multiple entries and fall back when needed
  4. Sub-task HDFS-6046
    add dfs.client.mmap.enabled
  5. Sub-task HDFS-6040
    fix DFSClient issue without libhadoop.so and some other ShortCircuitShm cleanups
  6. Sub-task HDFS-6036
    Forcibly timeout misbehaving DFSClients that try to do no-checksum reads that extend too long
  7. Sub-task HDFS-5973
    add DomainSocket#shutdown method
  8. Sub-task HDFS-5950
    The DFSClient and DataNode should use shared memory segments to communicate short-circuit information
  9. Sub-task HDFS-5940
    Minor cleanups to ShortCircuitReplica, FsDatasetCache, and DomainSocketWatcher
  10. Sub-task HDFS-5938
    Make BlockReaderFactory#BlockReaderPeer a static class
  11. Sub-task HDFS-5810
    Unify mmap cache and short-circuit file descriptor cache
  12. Sub-task HDFS-5746
    add ShortCircuitSharedMemorySegment
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