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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 19:05:40 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: 
#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.


  was:
# 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.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.

    
> 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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