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https://issues.apache.org/jira/browse/HDFS-10675?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15927202#comment-15927202
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Virajith Jalaparti edited comment on HDFS-10675 at 3/15/17 11:46 PM:
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Posting a new patch that rebases the earlier patch on the current version of
branch apache/HDFS-9806 (has been fast-forwarded to trunk last week).
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}}.
was (Author: virajith):
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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