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https://issues.apache.org/jira/browse/HDFS-9242?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14984419#comment-14984419
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Tsuyoshi Ozawa commented on HDFS-9242:
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[~brahmareddy] [~liuml07] I think this is not false positive. For more detail.
please check this article: http://www.cs.umd.edu/~pugh/java/memoryModel/
A correct way to fix is to make ugiCache volatile. Could you update it?
> Fix Findbugs warning from webhdfs.DataNodeUGIProvider.ugiCache
> ---------------------------------------------------------------
>
> Key: HDFS-9242
> URL: https://issues.apache.org/jira/browse/HDFS-9242
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Xiaoyu Yao
> Assignee: Brahma Reddy Battula
> Attachments: HDFS-9242.patch
>
>
> This was introduced by HDFS-8855 and pre-patch warning can be found at
> https://builds.apache.org/job/PreCommit-HDFS-Build/12975/artifact/patchprocess/trunkFindbugsWarningshadoop-hdfs.html#DC_DOUBLECHECK
> {code}
> Code Warning
> DC Possible doublecheck on
> org.apache.hadoop.hdfs.server.datanode.web.webhdfs.DataNodeUGIProvider.ugiCache
> in new
> org.apache.hadoop.hdfs.server.datanode.web.webhdfs.DataNodeUGIProvider(ParameterParser,
> Configuration)
> Bug type DC_DOUBLECHECK (click for details)
> In class
> org.apache.hadoop.hdfs.server.datanode.web.webhdfs.DataNodeUGIProvider
> In method new
> org.apache.hadoop.hdfs.server.datanode.web.webhdfs.DataNodeUGIProvider(ParameterParser,
> Configuration)
> On field
> org.apache.hadoop.hdfs.server.datanode.web.webhdfs.DataNodeUGIProvider.ugiCache
> At DataNodeUGIProvider.java:[lines 49-51]
> {code}
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