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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5171) NFS should create input stream for a file and try to share it with multiple read requests
Date Fri, 25 Oct 2013 11:02:32 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13805222#comment-13805222
] 

Hudson commented on HDFS-5171:
------------------------------

SUCCESS: Integrated in Hadoop-Yarn-trunk #373 (See [https://builds.apache.org/job/Hadoop-Yarn-trunk/373/])
HDFS-5171. NFS should create input stream for a file and try to share it with multiple read
requests. Contributed by Haohui Mai (brandonli: http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1535586)
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs-nfs/src/main/java/org/apache/hadoop/hdfs/nfs/nfs3/DFSClientCache.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs-nfs/src/main/java/org/apache/hadoop/hdfs/nfs/nfs3/RpcProgramNfs3.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs-nfs/src/test/java/org/apache/hadoop/hdfs/nfs/nfs3/TestDFSClientCache.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt


> NFS should create input stream for a file and try to share it with multiple read requests
> -----------------------------------------------------------------------------------------
>
>                 Key: HDFS-5171
>                 URL: https://issues.apache.org/jira/browse/HDFS-5171
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: nfs
>            Reporter: Brandon Li
>            Assignee: Haohui Mai
>             Fix For: 2.2.1
>
>         Attachments: HDFS-5171.000.patch, HDFS-5171.001.patch
>
>
> Currently, NFS creates an input steam for each read request and closes it after the request
is served. With lots of read request, the overhead is significant. 
> Like for write request, NFS should create input stream for a file and try to share it
with multiple read requests. The stream can be closed if there is no read request for a certain
amount of time (e.g., 10 sec).



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