The Research On Metadata Dissemination Technology For Data Grid

With the rapid growth of internet network scale, the traditional distributed computation and parallel processing technology hasn't met the need of this high-powered distributed computation and distributed management for large memory in the domain of computation-dense and data-dense application. As a result, grid technology came into being. Data grid of is the grid technology'application and realization in data management.The process of data accessing in the data grid depends on resource discovery which finds out the metadata that describes source. For the resource in grid frequently changes, the corresponding metadata changes a lot, too. To get the requisite metadata quickly and effectively requires that every node could disseminate its data to other corresponding nodes quickly and effectively, and this lies on the implement of metadata dissemination strategy which is classified as passive and active. Active metadata dissemination (ACTMD) has great veracity but it occupies too much network resource. Passive metadata dissemination (PASMD) has low cost but it hardly ensures the veracity of metadata.Rotating Meeting Metadata Dissemination (RMMD) disseminate metadata in the way of rotating meeting convocation, and adopts the data filtration mechanism in HLA data distribution management .The RMMD which has both the benefits of veracity of ACTMD and low cost of PASMD can disseminate metadata in the whole grid quickly and effectively, and make the metadata in the whole grid get better collocation with lower cost in a shorter time. Compared RMMD with PASMD and ACTMD through simulation experiment, the results show the RMMD strategy could disseminate the metadata in the whole grid effectively, increase the veracity and ensure the low cost of dissemination.