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From "Virajith Jalaparti (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9809) Abstract implementation-specific details from the datanode
Date Mon, 21 Mar 2016 19:30:26 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9809?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15204943#comment-15204943
] 

Virajith Jalaparti commented on HDFS-9809:
------------------------------------------

Hi [~zhz], Thanks for the comment. 

One concrete example where a different sub-class of {{ReplicaInfo}} might be used is Ozone
(HDFS-7240) where the replica can be stored in the underlying key-value store. Similar to
the {{DatasetSpi}}/{{FsDatasetSpi}}, we could have {{ReplicaInfo}}/{{FsReplicaInfo}}. We are
still going over the changes proposed by HDFS-7240 and in the process of understanding if
a different sub-class of {{ReplicaInfo}} makes sense there. 

We are currently working on the design document for HDFS-9806 and will post it soon (within
the week). If it ends up being the case that this work is useful only in the context of HDFS-9806,
we will make it a subtask. 



> Abstract implementation-specific details from the datanode
> ----------------------------------------------------------
>
>                 Key: HDFS-9809
>                 URL: https://issues.apache.org/jira/browse/HDFS-9809
>             Project: Hadoop HDFS
>          Issue Type: Task
>            Reporter: Virajith Jalaparti
>            Assignee: Virajith Jalaparti
>         Attachments: HDFS-9809.001.patch
>
>
> Multiple parts of the Datanode (FsVolumeSpi, ReplicaInfo, FSVolumeImpl etc.) implicitly
assume that blocks are stored in java.io.File(s) and that volumes are divided into directories.
We propose to abstract these details, which would help in supporting other storages. 



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