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// New API for global consumer:
Consumer<byte[], byte[]> getGlobalConsumer(final Map<String, Object> config); 

By refactoring deprecating the getConsumerConfigs function (name to getMainConsumerConfigsfrom now user should use getMainConsumerConfigs instead), rewriting the getRestoreConsumerConfigs function and adding the getGlobalConsumerConfigs function, if one user uses restoreConsumerPrefix or globalConsumerPrefix when adding new configurations, the configs shall overwrite base consumer config. If one just wants to change main consumer behavior without actually affecting other consumers, using mainConsumerPrefix would make sure the change only apply to main consumer. If not specified, main consumer, restore consumer and global consumer shall share the same config with base consumer.

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