[jira] [Created] (HDFS-14279) [SBN Read] Race condition in ObserverReadProxyProvider

["Erik Krogen (JIRA)" <ji...@apache.org>]

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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