[jira] [Created] (HDFS-5549) Support for implementing custom FsDatasetSpi from outside the project

["Ignacio Corderi (JIRA)" <ji...@apache.org>]

Ignacio Corderi created HDFS-5549:
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             Summary: Support for implementing custom FsDatasetSpi from outside the project
                 Key: HDFS-5549
                 URL: https://issues.apache.org/jira/browse/HDFS-5549
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: datanode
            Reporter: Ignacio Corderi


Visibility for multiple methods and a few classes got changed to public to allow FsDatasetSpi<T> and all the related classes that need subtyping to be fully implemented from outside the HDFS project.

Blocks transfers got abstracted to a factory given that the behavior will be changed for DataNodes using Kinetic drives. The existing DataNode to DataNode block transfer functionality got moved to LegacyBlockTransferer, no new configuration is needed to use this class and have the same behavior that is currently present.

DataNodes have an additional configuration key DFS_DATANODE_BLOCKTRANSFERER_FACTORY_KEY to override the default block transfer behavior.



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