Sandesha currently supports only an in-memory Queue.
Sandesha 目前仅支持内存中的 Queue。
The bid event is processed as a recovery mechanism should the in memory queue operation fail.
即使内存中队列的操作失败了，这个出价事件也能根据还原机制被处理。
One relies upon an in memory queue as we prefer very low latency between when a bid is placed and when it appears in My eBay.
一个是依靠内存中的队列，因为我们希望尽量缩短从出价到在显示在“我的eBay”页面上之间的响应时间。
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