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From "Kannan Rajah (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-11905) Abstraction for LocalDirAllocator
Date Wed, 06 May 2015 05:56:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-11905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14529979#comment-14529979
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Kannan Rajah commented on HADOOP-11905:
---------------------------------------

Please note that the change introduces new classes and only make one minor change to existing
class LocalDirAllocator - implements interface and exposes a method to get local dirs. So
it should not cause regressions. The goal is to let new app masters use this abstraction and
as needed change existing app masters. But that is not in the scope of this bug.

> Abstraction for LocalDirAllocator
> ---------------------------------
>
>                 Key: HADOOP-11905
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11905
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs
>    Affects Versions: 2.5.2
>            Reporter: Kannan Rajah
>            Assignee: Kannan Rajah
>              Labels: BB2015-05-TBR
>             Fix For: 2.7.1
>
>         Attachments: 0001-Abstraction-for-local-disk-path-allocation.patch
>
>
> There are 2 abstractions used to write data to local disk.
> LocalDirAllocator: Allocate paths from a set of configured local directories.
> LocalFileSystem/RawLocalFileSystem: Read/write using java.io.* and java.nio.*
> In the current implementation, local disk is managed by guest OS and not HDFS. The proposal
is to provide a new abstraction that encapsulates the above 2 abstractions and hides who manages
the local disks. This enables us to provide an alternate implementation where a DFS can manage
the local disks and it can be accessed using HDFS APIs. This means the DFS maintains a namespace
for node local directories and can create paths that are guaranteed to be present on a specific
node.
> Here is an example use case for Shuffle: When a mapper writes intermediate data using
this new implementation, it will continue write to local disk. When a reducer needs to access
data from a remote node, it can use HDFS APIs with a path that points to that node’s local
namespace instead of having to use HTTP server to transfer the data across nodes.
> New Abstractions
> 1. LocalDiskPathAllocator
> Interface to get file/directory paths from the local disk namespace.
> This contains all the APIs that are currently supported by LocalDirAllocator. So we just
need to change LocalDirAllocator to implement this new interface.
> 2. LocalDiskUtil
> Helper class to get a handle to LocalDiskPathAllocator and the FileSystem
> that is used to manage those paths.
> By default, it will return LocalDirAllocator and LocalFileSystem.
> A supporting DFS can return DFSLocalDirAllocator and an instance of DFS.
> 3. DFSLocalDirAllocator
> This is a generic implementation. An allocator is created for a specific node. It uses
Configuration object to get user configured base directory and appends the node hostname to
it. Hence the returned paths are within the node local namespace.



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