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https://issues.apache.org/jira/browse/HDFS-14279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16775639#comment-16775639
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Erik Krogen commented on HDFS-14279:
------------------------------------
Thanks for the review, [~shv]. I just committed this to trunk.
> [SBN Read] Race condition in ObserverReadProxyProvider
> ------------------------------------------------------
>
> Key: HDFS-14279
> URL: https://issues.apache.org/jira/browse/HDFS-14279
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs, namenode
> Reporter: Erik Krogen
> Assignee: Erik Krogen
> Priority: Major
> Attachments: HDFS-14279.000.patch, HDFS-14279.001.patch
>
>
> There is a race condition in {{ObserverReadProxyProvider#getCurrentProxy()}}:
> {code}
> private NNProxyInfo<T> getCurrentProxy() {
> if (currentProxy == null) {
> changeProxy(null);
> }
> return currentProxy;
> }
> {code}
> {{currentProxy}} is a {{volatile}}. Another {{changeProxy()}} could occur
> after the {{changeProxy()}} and before the {{return}}, thus making the return
> value incorrect. I have seen this result in an NPE.
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