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https://issues.apache.org/jira/browse/HDFS-10930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15543709#comment-15543709
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Xiaoyu Yao commented on HDFS-10930:
-----------------------------------
No, the goal is not to merge all these classes above into one mega-class. The
proposal is to wrap IO related datanode operations for easy instrumentation,
metric collection, logging and trouble shooting of datanode performance issues.
> Refactor Datanode IO operations into a single class
> ---------------------------------------------------
>
> Key: HDFS-10930
> URL: https://issues.apache.org/jira/browse/HDFS-10930
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Reporter: Xiaoyu Yao
> Assignee: Xiaoyu Yao
>
> Datanode IO (Disk/Network) related operations and instrumentations are
> currently spilled in many classes such as DataNode.java, BlockReceiver.java,
> BlockSender.java, FsDatasetImpl.java, FsVolumeImpl.java,
> DirectoryScanner.java, BlockScanner.java, FsDatasetAsyncDiskService.java,
> LocalReplica.java, LocalReplicaPipeline.java, Storage.java, etc. This ticket
> is opened to consolidate them into a single class.
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