# Constants
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处理的channel最大数量.
内存的最大长度.
一次处理的topic数量，考虑批量落地的数量.
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自定义模式，以消费者设置的StartIndex开始获取或订阅.
Last模式，以该消费者上次记录的位置开始订阅.
# Structs
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订阅器.
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# Interfaces
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# Type aliases
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