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[NSE-855] allocate large block of memory for all reducer - open PR881 #893
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…the preallocated buffer size for each column each reducer. max of pre-allocated memory in split is 1/4 of offheap memory per task
Signed-off-by: Yuan Zhou <yuan.zhou@intel.com>
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allocate a large block of buffer, then slice for each reducer and each column. Arrow still doesn't support 2M alignment, so large page isn't enabled.