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https://issues.apache.org/jira/browse/HDFS-5762?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13871662#comment-13871662
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Hadoop QA commented on HDFS-5762:
---------------------------------
{color:green}+1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12623043/HDFS-5762.002.patch
against trunk revision .
{color:green}+1 @author{color}. The patch does not contain any @author
tags.
{color:green}+1 tests included{color}. The patch appears to include 1 new
or modified test files.
{color:green}+1 javac{color}. The applied patch does not increase the
total number of javac compiler warnings.
{color:green}+1 javadoc{color}. The javadoc tool did not generate any
warning messages.
{color:green}+1 eclipse:eclipse{color}. The patch built with
eclipse:eclipse.
{color:green}+1 findbugs{color}. The patch does not introduce any new
Findbugs (version 1.3.9) warnings.
{color:green}+1 release audit{color}. The applied patch does not increase
the total number of release audit warnings.
{color:green}+1 core tests{color}. The patch passed unit tests in
hadoop-hdfs-project/hadoop-hdfs.
{color:green}+1 contrib tests{color}. The patch passed contrib unit tests.
Test results:
https://builds.apache.org/job/PreCommit-HDFS-Build/5878//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/5878//console
This message is automatically generated.
> BlockReaderLocal doesn't return -1 on EOF when doing zero-length reads
> ----------------------------------------------------------------------
>
> Key: HDFS-5762
> URL: https://issues.apache.org/jira/browse/HDFS-5762
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.4.0
> Reporter: Colin Patrick McCabe
> Assignee: Colin Patrick McCabe
> Attachments: HDFS-5762.001.patch, HDFS-5762.002.patch
>
>
> Unlike the other block readers, BlockReaderLocal currently doesn't return -1
> on EOF when doing zero-length reads. This behavior, in turn, propagates to
> the DFSInputStream. BlockReaderLocal should do this, so that client can
> determine whether the file is at an end by doing a zero-length read and
> checking for -1.
> One place this shows up is in libhdfs, which does such a 0-length read to
> determine if direct (i.e., ByteBuffer) reads are supported.
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