Use cases where HMaster deals with DFS client

[Vimal Jain <vk...@gmail.com>]

Hi,
While reading Hbase:The definitive guide , its mentioned that sometimes
Hmaster may have to deal with DFS client for accessing HFiles.
What is the use case ?

-- 
Thanks and Regards,
Vimal Jain

Re: Use cases where HMaster deals with DFS client

[Vimal Jain <vk...@gmail.com>]

Thanks stack.
Yes , book does not have more info on that.


On Wed, Mar 19, 2014 at 11:53 AM, Stack <st...@duboce.net> wrote:

> Does the book say no more than that?
>
> Most of the master fs access is encapsulated inside this class:
>
> http://hbase.apache.org/xref/org/apache/hadoop/hbase/master/MasterFileSystem.html
> Take a browse.  See how Master does stuff like set up the initial
> layout
> on fresh-start/bootstrap and how it orchestrates the WAL file splitting on
> regionserver crash, etc.
>
> St.Ack
>
>
> On Tue, Mar 18, 2014 at 10:22 PM, Vimal Jain <vk...@gmail.com> wrote:
>
> > Hi,
> > While reading Hbase:The definitive guide , its mentioned that sometimes
> > Hmaster may have to deal with DFS client for accessing HFiles.
> > What is the use case ?
> >
> > --
> > Thanks and Regards,
> > Vimal Jain
> >
>



-- 
Thanks and Regards,
Vimal Jain

Re: Use cases where HMaster deals with DFS client

[Stack <st...@duboce.net>]

Does the book say no more than that?

Most of the master fs access is encapsulated inside this class:
http://hbase.apache.org/xref/org/apache/hadoop/hbase/master/MasterFileSystem.html
Take a browse.  See how Master does stuff like set up the initial
layout
on fresh-start/bootstrap and how it orchestrates the WAL file splitting on
regionserver crash, etc.

St.Ack


On Tue, Mar 18, 2014 at 10:22 PM, Vimal Jain <vk...@gmail.com> wrote:

> Hi,
> While reading Hbase:The definitive guide , its mentioned that sometimes
> Hmaster may have to deal with DFS client for accessing HFiles.
> What is the use case ?
>
> --
> Thanks and Regards,
> Vimal Jain
>