Records are write-once, read-only documents that provide formal evidence of what was accomplished.
记录是种只写一次,只读的文档,它提供了正式的所实现内容的依据。
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。
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