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