Erik Krogen created HDFS-14279:
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Summary: [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
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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