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https://issues.apache.org/jira/browse/HDFS-5810?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13890987#comment-13890987
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Colin Patrick McCabe commented on HDFS-5810:
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Javadoc warnings come from using sun.misc.Unsafe, as I commented earlier.
{code}
10 warnings
[WARNING] Javadoc Warnings
[WARNING]
/home/jenkins/jenkins-slave/workspace/PreCommit-HDFS-Build/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/nativeio/NativeIO.java:42:
warning: sun.misc.Unsafe is Sun proprietary API and may be removed in a future
release
[WARNING] import sun.misc.Unsafe;
{code}
Seems to be unavoidable.
Findbugs warning is also bogus. It seems to be confused by having two "take
lock, release on try/finally" blocks in the function instead of one.
TestHttpServer failure looks like HADOOP-10289. It passed for me locally, and
this patch doesn't affect the HttpServer.
> Unify mmap cache and short-circuit file descriptor cache
> --------------------------------------------------------
>
> Key: HDFS-5810
> URL: https://issues.apache.org/jira/browse/HDFS-5810
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: hdfs-client
> Affects Versions: 2.3.0
> Reporter: Colin Patrick McCabe
> Assignee: Colin Patrick McCabe
> Attachments: HDFS-5810.001.patch, HDFS-5810.004.patch,
> HDFS-5810.006.patch, HDFS-5810.008.patch, HDFS-5810.015.patch
>
>
> We should unify the client mmap cache and the client file descriptor cache.
> Since mmaps are granted corresponding to file descriptors in the cache
> (currently FileInputStreamCache), they have to be tracked together to do
> "smarter" things like HDFS-5182.
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