俗话说“装载一次读取多少次(load once and read many,lorm)”或“写一次读多少次(write once and read many,worm)”的数据无疑是数据仓库的重要部分。
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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。
A write-once read-many information recording medium the reliability of which with respect to a high recording sensitivity and a long-term storage is ensured.
本发明提供一种可确保高记录灵敏度和相对长期保存的可靠性的单写多读型信息记录介质。
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