log.info("Create B-Tree extent file.");
btnd = new NodeDescriptor(0, 0, NodeDescriptor.BT_HEADER_NODE, 0, 3);
//
int totalNodes = params.getExtentClumpSize() / params.getExtentNodeSize();
int freeNodes = totalNodes - 1;
bthr = new BTHeaderRecord(0, 0, 0, 0, 0, params.getExtentNodeSize(),
ExtentKey.MAXIMUM_KEY_LENGTH, totalNodes, freeNodes,
params.getExtentClumpSize(), BTHeaderRecord.BT_TYPE_HFS,
BTHeaderRecord.KEY_COMPARE_TYPE_CASE_FOLDING,
BTHeaderRecord.BT_BIG_KEYS_MASK);
}