func (self *ShardData) QueryResponseBufferSize(querySpec *parser.QuerySpec, batchPointSize int) int { groupByTime := querySpec.GetGroupByInterval() if groupByTime == nil { // If the group by time is nil, we shouldn't have to use a buffer since the shards should be queried sequentially. // However, set this to something high just to be safe. log.Debug("BUFFER SIZE: 1000") return 1000 } tickCount := int(self.shardNanoseconds / uint64(*groupByTime)) if tickCount < 10 { tickCount = 100 } else if tickCount > 1000 { // cap this because each response should have up to this number of points in it. tickCount = tickCount / batchPointSize // but make sure it's at least 1k if tickCount < 1000 { tickCount = 1000 } } columnCount := querySpec.GetGroupByColumnCount() if columnCount > 1 { // we don't really know the cardinality for any column up front. This is a just a multiplier so we'll see how this goes. // each response can have many points, so having a buffer of the ticks * 100 should be safe, but we'll see. tickCount = tickCount * 100 } log.Debug("BUFFER SIZE: %d", tickCount) return tickCount }