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From "Hudson (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2465) Add HDFS support for fadvise readahead and drop-behind
Date Fri, 28 Oct 2011 23:31:33 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2465?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13138950#comment-13138950
] 

Hudson commented on HDFS-2465:
------------------------------

Integrated in Hadoop-Common-trunk-Commit #1193 (See [https://builds.apache.org/job/Hadoop-Common-trunk-Commit/1193/])
    HDFS-2465. Add HDFS support for fadvise readahead and drop-behind. Contributed by Todd
Lipcon.

todd : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1190626
Files : 
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockReceiver.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockSender.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java

                
> Add HDFS support for fadvise readahead and drop-behind
> ------------------------------------------------------
>
>                 Key: HDFS-2465
>                 URL: https://issues.apache.org/jira/browse/HDFS-2465
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: data-node, performance
>    Affects Versions: 0.23.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: 0.23.0
>
>         Attachments: hdfs-2465.txt, hdfs-2465.txt, hdfs-2465.txt, hdfs-2465.txt
>
>
> This is the HDFS side of HADOOP-7714. The initial implementation is heuristic based and
should be considered experimental, as discussed in the parent JIRA. It should be off by default
until better heuristics, APIs, and tuning experience is developed.

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