paulward24 commented on issue #1015: HashMap is not thread safe. Field storageMap is typically synchronized by storageMap. However, in one place, field storageMap is not protected with synchronized. URL: https://github.com/apache/hadoop/pull/1015#issuecomment-505730705 I see some tests failed. I don't know why this small change would break those tests. Maybe somebody more familiar with the project can take a look. Either way, the original problem --- using a thread-unsafe HashMap concurrently without synchronization --- remains.
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