| 摘要 |
In one embodiment, the present invention is a method and apparatus for data stream sampling. In one embodiment, a tuple of a data stream is received from a sampling window of the data stream. The tuple is associated with a group, selected from a set of one or more groups, which reflects a subset of information relating to a sample of the data stream. In addition, the tuple is associated with a supergroup, selected from a set of one or more supergroups, which reflects global information relating to the sample. It is then determined whether receipt of the tuple triggers a cleaning phase in which one or more tuples are shed from the sample. The operator can be implemented to execute a variety of different sampling algorithms, including well-known and experimental algorithms.
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