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https://issues.apache.org/jira/browse/HDFS-14889?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ashvin Agrawal updated HDFS-14889:
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Description:
Provided storage (HDFS-9806) allows data on external storage systems to
seamlessly appear as files on HDFS. However, in the implementation today, there
is no easy way to distinguish a {{Block}} belonging to an external provided
storage volume from a block belonging to the local cluster. This task
simplifies this.
{{isProvided}} block will be useful in hybrid scenarios when the local cluster
will host both kinds of blocks. For e.g. policy for management of
replica/cached-blocks will be different from that of regular blocks. As of this
task {{isProvided}} is not invoked anywhere.
was:Provided storage (HDFS-9806) allows data on external storage systems to
seamlessly appear as files on HDFS. However, in the implementation today, there
is no easy way to distinguish a {{Block}} belonging to an external provided
storage volume from a block belonging to the local cluster. This task
simplifies this. This feature will be useful in hybrid scenarios when the local
cluster will host both kinds of blocks.
> Ability to check if a block has a replica on provided storage
> -------------------------------------------------------------
>
> Key: HDFS-14889
> URL: https://issues.apache.org/jira/browse/HDFS-14889
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Ashvin Agrawal
> Assignee: Ashvin Agrawal
> Priority: Major
>
> Provided storage (HDFS-9806) allows data on external storage systems to
> seamlessly appear as files on HDFS. However, in the implementation today,
> there is no easy way to distinguish a {{Block}} belonging to an external
> provided storage volume from a block belonging to the local cluster. This
> task simplifies this.
> {{isProvided}} block will be useful in hybrid scenarios when the local
> cluster will host both kinds of blocks. For e.g. policy for management of
> replica/cached-blocks will be different from that of regular blocks. As of
> this task {{isProvided}} is not invoked anywhere.
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