write one read many worm 一写多读机
These applications write their data only once but they read it one or more times and require these reads to be satisfied at streaming speeds. HDFS supports write-once-read-many semantics on files.
这些应用都是写数据一次，读却是一次到多次，并且读的速度要满足流式读。
Think about how many times you read or write in one day.
试想您在一天中阅读或书写了多少次。
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