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METHOD AND MECHANISM FOR EFFICIENT RE-DISTRIBUTION OF IN-MEMORY COLUMNAR UNITS IN A CLUSTERED RDBMS ON TOPOLOGY CHANGE

  • US 20200133950A1
  • Filed: 12/23/2019
  • Published: 04/30/2020
  • Est. Priority Date: 01/27/2016
  • Status: Active Grant
First Claim
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1. A method comprising:

  • for each map-storing node of a plurality of map-storing nodes in a database system, maintaining a respective mapping that indicates;

    a plurality of chunks of data;

    for each chunk of the plurality of chunks of data;

    one or more host nodes assigned to the chunk, andfor each host node of the one or more host nodes assigned to the chunk, a registration timestamp corresponding to a time when the map-storing node established that the host node was a host of the chunk;

    in response to a re-distribution event, determining a first set of one or more chunks, of the plurality of chunks, affected by the re-distribution event;

    for each chunk of the first set of chunks;

    determining at least one additional host node for the chunk;

    each map-storing node, of the plurality of map-storing nodes, updating the respective mapping to indicate the at least one additional host node and an additional registration timestamp for the chunk for the at least one additional host node;

    wherein the method is performed by one or more computing devices.

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