yongmeibian opened a new pull request #8956: concurrent access to charsetfix method throws IllegalStateException bugfix URL: https://github.com/apache/incubator-druid/pull/8956 java.nio.charset.CharsetEncoder.canEncode throws IllegalStateException if an encoding operation is already in progress.And org.apache.druid.java.util.common.parsers.JSONFlattenerMaker has a private final CharsetEncoder enc = StandardCharsets.UTF_8.newEncoder() as its member variable and the charsetFix() executes "if (s != null && !enc.canEncode(s))" which makes charsetFix() cannot be accessed concurrently either. Fixed the bug: access JSONFlattenerMaker charsetFix() concurrently throws IllegalStateException ##### Key changed/added classes in this PR JSONFlattenerMaker
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