judge allowRollback first to improve performance #1466
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麻烦说明一下变动的背景 |
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allowRollback 为false的请求下应该直接返回size， 现在的实现是先从后往前做一遍看有没有不完整json数据，然后再判定allowRollback ， 做了很多无用功，cpu消耗比较严重 |
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