Try mapsideJoinStrategy.create() On Mon, May 9, 2016, 9:29 PM 陈竞 <[email protected]> wrote:
> hi, i'm very confused when i use MapsideJoinStrategy. the origin > constructor was deprecated, instead, LoadLeftSideMapsideJoinStrategy was > recommended, the main improvement is that load left side table in memory, > whose size is large than right side. however, when i want to use mas side > join, the left side table usually is too large to store in memory. > > for example i have to table A and B, we need A left join B, and > size(A)>>size(B), naturally we want to use map side join, and use A as left > side, B as right side, then load B in memory to process, it's very simple. > However, if we use LoadLeftSideMapsideJoinStrategy, we use A as right side, > B as left side, which makes no improvement while adding a reverse DoFn > > > > -- > 陈竞，中科院计算技术研究所，高性能计算机中心 > Jing Chen HPCC.ICT.AC China >
