[jira] [Updated] (HDFS-10675) Datanode support to read from external stores.

["Virajith Jalaparti (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-10675?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Virajith Jalaparti updated HDFS-10675:
--------------------------------------
    Attachment: HDFS-10675-HDFS-9806.004.patch

Posting a new patch that rebases the earlier patch on the current version of branch apache/HDFS-9806. 

It also fixes (a) Null pointer exceptions that occur when a Datanode runs with {{dfs.datanode.data.dir}} that is PROVIDED and remote (e.g., \[PROVIDED\]s3a://.... or \[PROVIDED\]hdfs://....), and (b) prevents polluting {{dfs.datanode.data.dir}}  that are \[PROVIDED\]file:///... i.e., avoids creation of the DN file hierarchy ({{current/}}) in the specified {{dfs.datanode.data.dir}} if it is {{PROVIDED}}. 

> Datanode support to read from external stores. 
> -----------------------------------------------
>
>                 Key: HDFS-10675
>                 URL: https://issues.apache.org/jira/browse/HDFS-10675
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Virajith Jalaparti
>         Attachments: HDFS-10675-HDFS-9806.001.patch, HDFS-10675-HDFS-9806.002.patch, HDFS-10675-HDFS-9806.003.patch, HDFS-10675-HDFS-9806.004.patch
>
>
> This JIRA introduces a new {{PROVIDED}} {{StorageType}} to represent external stores, along with enabling the Datanode to read from such stores using a {{ProvidedReplica}} and a {{ProvidedVolume}}.



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