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

By rewriting refactoring the getRestoreConsumerConfigsgetConsumerConfigs function () function name to getMainConsumerConfigs), rewriting the getRestoreConsumerConfigs function and adding the getGlobalConsumerConfigs() getGlobalConsumerConfigs function, if one user uses restoreConsumerPrefix() or globalConsumerPrefix() when  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() 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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