Systems, methods, and computer products for information sharing using personalized index caching

A system for creating a metaindex from an index of a node A to which metadata information is added, the system comprising:

• a processor;
• and
• a local disk operatively coupled to the processor,
• wherein the processor is configured to perform:
• in response to a determination that the metaindex of the node A is cached on the local disk, searching the metaindex of the node A;
• locating a file for access;
• determining ownership of the file to access information associated with the metaindex of the node A;
• obtaining permission to access the file;
• extracting characteristics of an index of the node A, wherein the characteristics include keywords that reflect an interest from the node A;
• receiving a search query history from a node X in the node A;
• searching the extracted index of the node A, which include a file ID;
• adding metadata to the index of the node A;
• in response to a determination that the node A includes at least one additional local metaindex, searching the at least one additional metaindex with the search query history from the node X in the node A, and merging search results with the metaindex of the node A, wherein the one additional metaindex merged to the metaindex of the node A includes an acquisition path;
• extracting a difference history of the search query history from the node X in the node A;
• selecting keywords that are included in the difference history;
• calculating a relevance ratio of keywords that are not included in the difference history with a selected keyword;
• calculating a time value for each keyword with the relevance ratio;
• in response to a determination that the keyword was sent a time greater than the time value, adding the keyword to a relevance history;
• in response to a determination that there are no other keywords included in the difference history, sending the difference history and the relevance history to the node A;
• and
• sending the metaindex of the node A to the node X.