MapReduce based XML data query method and system
A data query and XML tree technology, applied in the field of XML query processing, can solve problems such as slow query speed
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[0105] like figure 1 As shown, the present embodiment discloses a XML data query method based on MapReduce, and it is characterized in that, the steps are as follows:
[0106] Step 101, the server receives the XPath query request from the client;
[0107] Step 102, after receiving the XPath query request, the server checks whether the XML document to be queried has been range coded;
[0108] If not, then enter step 103;
[0109] If so, enter step 104;
[0110] Step 103, perform interval encoding on the XML document to be queried, and then enter step 104; in this step, use MapReduce to perform interval encoding on the nodes in the XML tree in the XML document data, the specific process is as follows: Hadoop framework converts the XML tree in the XML document data The nodes in are input to the Map function in the form of key-value pairs. The input of the Map function includes two types, one of which is the start tag, and the other is the end tag; each time the Map function ob...
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