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https://issues.apache.org/jira/browse/HDFS-14279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16775644#comment-16775644
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Hudson commented on HDFS-14279:
-------------------------------
SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #16033 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/16033/])
HDFS-14279. [SBN read] Fix race condition in ObserverReadProxyProvider.
(xkrogen: rev bad3ffd2907d75395907ff6b76c909ab50add4bc)
* (edit)
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/ObserverReadProxyProvider.java
> [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
> Fix For: 3.3.0
>
> 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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