# I am the Watcher. I am your guide through this vast new twtiverse.
# 
# Usage:
#     https://watcher.sour.is/api/plain/users              View list of users and latest twt date.
#     https://watcher.sour.is/api/plain/twt                View all twts.
#     https://watcher.sour.is/api/plain/mentions?uri=:uri  View all mentions for uri.
#     https://watcher.sour.is/api/plain/conv/:hash         View all twts for a conversation subject.
# 
# Options:
#     uri     Filter to show a specific users twts.
#     offset  Start index for quey.
#     limit   Count of items to return (going back in time).
# 
# twt range = 1 1
# self = https://watcher.sour.is/conv/xrwfh5q
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Apache BookKeeper 一致性協議解析**
導語Apache Pulsar 是一個多租戶、高性能的服務間消息傳輸解決方案，支持多租戶、低延時、讀寫分離、跨地域複製（GEO replication）、快速擴容、靈活容錯等特性。Pulsar 存儲層依託於 BookKeeper 組件，所以本文簡單探討一下 BookKeeper(下文簡稱 BK) 的一致性協議是如何實現的。背景Pulsar 相對於 Kafka 根本的區別在於數據一致性協議，這也是爲 ⌘ Read more