# Functions
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IsUniqueMessageInSeconds 验证消息ID在一段时间内是否唯一，当前逻辑存在消息消费不准确的情况，使用 IsUniqueMessage 代替，3小时内确保唯一Deprecated.
IsUniqueRdsKey 识别消息是否唯一.
NewNsqLookup 创建nsqd实例.
UnmarshalNsqMessage 将NSQ的消息转换为指定的对象.
# Constants
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低优先级，一般限制处理速率.
正常优先级，使用不同的字符串进行标记并进行统一处理.
# Structs
MessageHeader 消息头.
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Topic非顺序的topic, 由于支持同一个partition进行多个并发消费, 因此无需过多的partitions, 只需保证写入性能满足需求即可,另外为了保持和原版nsq兼容, 每个节点只能有一个分区, 因此分区数*副本数不能大于节点总数.
# Interfaces
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