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From "Jitendra Nath Pandey (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-2246) Shortcut a local client reads to a Datanodes files directly
Date Wed, 23 Nov 2011 19:07:40 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2246?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jitendra Nath Pandey updated HDFS-2246:
---------------------------------------

    Target Version/s: 0.20.205.1, 0.24.0, 0.23.1  (was: 0.23.1, 0.24.0, 0.20.205.1)
        Release Note: 
1. New configurations
a. dfs.block.local-path-access.user is the key in datanode configuration to specify the user
allowed to do short circuit read.
b. dfs.client.read.shortcircuit is the key to enable short circuit read at the client side
configuration.
c. dfs.client.read.shortcircuit.skip.checksum is the key to bypass checksum check at the client
side.
2. By default none of the above are enabled and short circuit read will not kick in.
3. If security is on, the feature can be used only for user that has kerberos credentials
at the client, therefore map reduce tasks cannot benefit from it in general.


  was:
#New configurations
## dfs.block.local-path-access.user is the key in datanode configuration to specify the user
allowed to do short circuit read.
## dfs.client.read.shortcircuit is the key to enable short circuit read at the client side
configuration.
## dfs.client.read.shortcircuit.skip.checksum is the key to bypass checksum check at the client
side.
#By default none of the above are enabled and short circuit read will not kick in.
#The feature can be used only for user that has kerberos credentials at the client, therefore
map reduce tasks cannot benefit from it in general.


    
> Shortcut a local client reads to a Datanodes files directly
> -----------------------------------------------------------
>
>                 Key: HDFS-2246
>                 URL: https://issues.apache.org/jira/browse/HDFS-2246
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Sanjay Radia
>            Assignee: Jitendra Nath Pandey
>             Fix For: 0.24.0
>
>         Attachments: 0001-HDFS-347.-Local-reads.patch, HDFS-2246-branch-0.20-security-205.1.patch,
HDFS-2246-branch-0.20-security-205.2.patch, HDFS-2246-branch-0.20-security-205.patch, HDFS-2246-branch-0.20-security-205.patch,
HDFS-2246-branch-0.20-security-205.patch, HDFS-2246-branch-0.20-security.3.patch, HDFS-2246-branch-0.20-security.no-softref.patch,
HDFS-2246-branch-0.20-security.patch, HDFS-2246-branch-0.20-security.patch, HDFS-2246-branch-0.20-security.patch,
HDFS-2246-branch-0.20-security.patch, HDFS-2246-trunk.patch, HDFS-2246-trunk.patch, HDFS-2246-trunk.patch,
HDFS-2246-trunk.patch, HDFS-2246-trunk.patch, HDFS-2246-trunk.patch, HDFS-2246.20s.1.patch,
HDFS-2246.20s.2.txt, HDFS-2246.20s.3.txt, HDFS-2246.20s.4.txt, HDFS-2246.20s.patch, TestShortCircuitLocalRead.java,
localReadShortcut20-security.2patch
>
>


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