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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7694) FSDataInputStream should support "unbuffer"
Date Fri, 13 Feb 2015 15:26:15 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14320270#comment-14320270
] 

Hudson commented on HDFS-7694:
------------------------------

FAILURE: Integrated in Hadoop-Mapreduce-trunk #2054 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk/2054/])
HDFS-7694. FSDataInputStream should support "unbuffer" (cmccabe) (cmccabe: rev 6b39ad0865cb2a7960dd59d68178f0bf28865ce2)
* hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs/hdfs.h
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSInputStream.java
* hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs/hdfs.c
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/PeerCache.java
* hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FSDataInputStream.java
* hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/TestUnbuffer.java
* hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/CanUnbuffer.java


> FSDataInputStream should support "unbuffer"
> -------------------------------------------
>
>                 Key: HDFS-7694
>                 URL: https://issues.apache.org/jira/browse/HDFS-7694
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>    Affects Versions: 2.7.0
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>             Fix For: 2.7.0
>
>         Attachments: HDFS-7694.001.patch, HDFS-7694.002.patch, HDFS-7694.003.patch, HDFS-7694.004.patch,
HDFS-7694.005.patch
>
>
> For applications that have many open HDFS (or other Hadoop filesystem) files, it would
be useful to have an API to clear readahead buffers and sockets.  This could be added to the
existing APIs as an optional interface, in much the same way as we added setReadahead / setDropBehind
/ etc.



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