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From "Ashvin Agrawal (Jira)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-14889) Ability to check if a block has a replica on provided storage
Date Thu, 03 Oct 2019 21:40:00 GMT

     [ https://issues.apache.org/jira/browse/HDFS-14889?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ashvin Agrawal updated HDFS-14889:
----------------------------------
    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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