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https://issues.apache.org/jira/browse/HADOOP-12760?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16608849#comment-16608849
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Akira Ajisaka commented on HADOOP-12760:
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Hi [~tasanuma0829],
bq. Seems CleanerUtil.UNMAP_NOT_SUPPORTED_REASON is never used. How about using
this information for a logging in the caller side?
Sorry for very late response. The logging seems good to me, and it should be
trace or debug level because it can easily fill up the log.
> sun.misc.Cleaner has moved to a new location in OpenJDK 9
> ---------------------------------------------------------
>
> Key: HADOOP-12760
> URL: https://issues.apache.org/jira/browse/HADOOP-12760
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Chris Hegarty
> Assignee: Akira Ajisaka
> Priority: Major
> Attachments: HADOOP-12760.00.patch, HADOOP-12760.01.patch,
> HADOOP-12760.02.patch, HADOOP-12760.03.patch, HADOOP-12760.04.patch,
> HADOOP-12760.05.patch, HADOOP-12760.06.patch, HADOOP-12760.07.patch
>
>
> This is a heads-up: there are upcoming changes in JDK 9 that will require, at
> least, a small update to org.apache.hadoop.crypto.CryptoStreamUtils &
> org.apache.hadoop.io.nativeio.NativeIO.
> OpenJDK issue no. 8148117: "Move sun.misc.Cleaner to jdk.internal.ref" [1],
> will move the Cleaner class from sun.misc to jdk.internal.ref. There is
> ongoing discussion about the possibility of providing a public supported API,
> maybe in the JDK 9 timeframe, for releasing NIO direct buffer native memory,
> see the core-libs-dev mail thread [2]. At the very least CryptoStreamUtils &
> NativeIO [3] should be updated to have knowledge of the new location of the
> JDK Cleaner.
> [1] https://bugs.openjdk.java.net/browse/JDK-8148117
> [2]
> http://mail.openjdk.java.net/pipermail/core-libs-dev/2016-January/038243.html
> [3] https://github.com/apache/hadoop/search?utf8=✓&q=sun.misc.Cleaner
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