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https://issues.apache.org/jira/browse/HDFS-5549?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13832243#comment-13832243
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Ignacio Corderi commented on HDFS-5549:
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Any idea what's going on with TestBalancerWithNodeGroup? Keeps timing out on me.
Looking at the failed test history it seems it likes timing out from time to
time.
> 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
> Affects Versions: 3.0.0
> Reporter: Ignacio Corderi
> Attachments: HDFS-5549.patch
>
>
> 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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