实时任务flink on yarn运行，实时同步MySQL表到StarRocks经常遇到的内存问题：十万级别的数据量使用jm
1024mb，tm1024mb启动会报连接超时的问题，tm改成2048mb就会同步成功，但是源表十万级别数据量tm用2048mb内存非常浪费，看jobmanager日志，主要原因应该在chunk上，因为源表主键id的最大值为190562215，最小id为
1，可能是因为chunk太大导致内存不够，这种应该怎么优化下呢？
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