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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-3228) Use fadvise in local read path
Date Wed, 13 Jun 2012 01:35:44 GMT

     [ https://issues.apache.org/jira/browse/HDFS-3228?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated HDFS-3228:
------------------------------

    Comment: was deleted

(was: Integrated in Hadoop-Mapreduce-trunk-Commit #2372 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk-Commit/2372/])
    HDFS-3228. Move DelegationTokenRenewer to common (tucu) (Revision 1349555)

     Result = FAILURE
tucu : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1349555
Files : 
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/DelegationTokenRenewer.java
* /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/HftpFileSystem.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/security/token/delegation/DelegationTokenRenewer.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/web/WebHdfsFileSystem.java
)
    
> Use fadvise in local read path
> ------------------------------
>
>                 Key: HDFS-3228
>                 URL: https://issues.apache.org/jira/browse/HDFS-3228
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs client, performance
>            Reporter: Henry Robinson
>            Assignee: Henry Robinson
>
> The read path through BlockReaderLocal does not take advantage of readahead or drop-behind
in the way that BlockSender does. We could arguably stand to gain even more from hinting about
read patterns to the kernel here, so we should add the same mechanisms to BlockReaderLocal.


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