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https://issues.apache.org/jira/browse/HDFS-14088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16691488#comment-16691488
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Yuxuan Wang commented on HDFS-14088:
------------------------------------
I'll attach a patch later.
> RequestHedgingProxyProvider can throw NullPointerException when failvoer due
> to no lock on currentUsedProxy
> -----------------------------------------------------------------------------------------------------------
>
> Key: HDFS-14088
> URL: https://issues.apache.org/jira/browse/HDFS-14088
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs-client
> Reporter: Yuxuan Wang
> Priority: Major
>
> {code:java}
> if (currentUsedProxy != null) {
> try {
> Object retVal = method.invoke(currentUsedProxy.proxy, args);
> LOG.debug("Invocation successful on [{}]",
> currentUsedProxy.proxyInfo);
> {code}
> If a thread run try block and then other thread trigger a fail over calling
> method
> {code:java}
> @Override
> public synchronized void performFailover(T currentProxy) {
> toIgnore = this.currentUsedProxy.proxyInfo;
> this.currentUsedProxy = null;
> }
> {code}
> It will set currentUsedProxy to null, and the first thread can throw a
> NullPointerException.
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