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https://issues.apache.org/jira/browse/HADOOP-11905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14530079#comment-14530079
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Hadoop QA commented on HADOOP-11905:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | pre-patch | 14m 38s | Pre-patch trunk compilation is
healthy. |
| {color:green}+1{color} | @author | 0m 0s | The patch does not contain any
@author tags. |
| {color:green}+1{color} | tests included | 0m 0s | The patch appears to
include 1 new or modified test files. |
| {color:green}+1{color} | javac | 7m 27s | There were no new javac warning
messages. |
| {color:green}+1{color} | javadoc | 9m 36s | There were no new javadoc
warning messages. |
| {color:green}+1{color} | release audit | 0m 22s | The applied patch does
not increase the total number of release audit warnings. |
| {color:red}-1{color} | checkstyle | 1m 4s | The applied patch generated 6
new checkstyle issues (total was 93, now 99). |
| {color:red}-1{color} | whitespace | 0m 0s | The patch has 1 line(s) that
end in whitespace. Use git apply --whitespace=fix. |
| {color:green}+1{color} | install | 1m 34s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse | 0m 32s | The patch built with
eclipse:eclipse. |
| {color:green}+1{color} | findbugs | 1m 39s | The patch does not introduce
any new Findbugs (version 2.0.3) warnings. |
| {color:green}+1{color} | common tests | 21m 59s | Tests passed in
hadoop-common. |
| | | 58m 56s | |
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|| Subsystem || Report/Notes ||
| Patch URL |
http://issues.apache.org/jira/secure/attachment/12730000/0001-Abstraction-for-local-disk-path-allocation.patch
|
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / a583a40 |
| checkstyle |
https://builds.apache.org/job/PreCommit-HADOOP-Build/6502/artifact/patchprocess/diffcheckstylehadoop-common.txt
|
| whitespace |
https://builds.apache.org/job/PreCommit-HADOOP-Build/6502/artifact/patchprocess/whitespace.txt
|
| hadoop-common test log |
https://builds.apache.org/job/PreCommit-HADOOP-Build/6502/artifact/patchprocess/testrun_hadoop-common.txt
|
| Test Results |
https://builds.apache.org/job/PreCommit-HADOOP-Build/6502/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf905.gq1.ygridcore.net 3.13.0-36-lowlatency #63-Ubuntu SMP
PREEMPT Wed Sep 3 21:56:12 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux |
| Console output |
https://builds.apache.org/job/PreCommit-HADOOP-Build/6502/console |
This message was automatically generated.
> 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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