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https://issues.apache.org/jira/browse/MAPREDUCE-5020?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13583628#comment-13583628
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Hadoop QA commented on MAPREDUCE-5020:
--------------------------------------
{color:red}-1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12570367/MAPREDUCE-5020.patch
against trunk revision .
{color:green}+1 @author{color}. The patch does not contain any @author
tags.
{color:red}-1 tests included{color}. The patch doesn't appear to include
any new or modified tests.
Please justify why no new tests are needed for this
patch.
Also please list what manual steps were performed to
verify this patch.
{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-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core.
{color:green}+1 contrib tests{color}. The patch passed contrib unit tests.
Test results:
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3354//testReport/
Console output:
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3354//console
This message is automatically generated.
> Compile failure with JDK8
> -------------------------
>
> Key: MAPREDUCE-5020
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5020
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: client
> Affects Versions: 2.0.3-alpha
> Environment: java version "1.8.0-ea"
> Java(TM) SE Runtime Environment (build 1.8.0-ea-b36e)
> Java HotSpot(TM) Client VM (build 25.0-b04, mixed mode)
> Reporter: Trevor Robinson
> Assignee: Trevor Robinson
> Labels: build-failure, jdk8
> Attachments: MAPREDUCE-5020.patch
>
>
> Compiling {{org/apache/hadoop/mapreduce/lib/partition/InputSampler.java}}
> fails with the Java 8 preview compiler due to its stricter enforcement of JLS
> 15.12.2.6 (for [Java
> 5|http://docs.oracle.com/javase/specs/jls/se5.0/html/expressions.html#15.12.2.6]
> or [Java
> 7|http://docs.oracle.com/javase/specs/jls/se7/html/jls-15.html#jls-15.12.2.6]),
> which demands that methods applicable via unchecked conversion have their
> return type erased:
> {noformat}
> [ERROR]
> hadoop-common/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/lib/partition/InputSampler.java:[320,35]
> error: incompatible types: Object[] cannot be converted to K[]
> {noformat}
> {code}
> @SuppressWarnings("unchecked") // getInputFormat, getOutputKeyComparator
> public static <K,V> void writePartitionFile(Job job, Sampler<K,V> sampler)
> throws IOException, ClassNotFoundException, InterruptedException {
> Configuration conf = job.getConfiguration();
> final InputFormat inf =
> ReflectionUtils.newInstance(job.getInputFormatClass(), conf);
> int numPartitions = job.getNumReduceTasks();
> K[] samples = sampler.getSample(inf, job); // returns Object[] according
> to JLS
> {code}
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