选择为memory调度模式，出现同步异常后会挂住不再做同步

同步过程中因为出现内存不足，出现miss data异常，触发了otter进行rollback操作.

在同步日志中出现： [pipelineId = 1,taskName = ProcessSelect] WARN com.alibaba.otter.node.etl.select.SelectTask - rollback happend , should skip this data and get new message.

然后几个程序就处于一个业务死锁状态.

ProcessSelect一直在等待rollback动作完成

"pipelineId = 1,taskName = ProcessSelect" prio=10 tid=0x00007f9cac08c000 nid=0x4240 waiting on condition [0x00007f9cdc7ba000] java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method) - parking to wait for <0x00000000a1a95ba0> (a com.alibaba.otter.shared.common.utils.lock.BooleanMutex$Sync) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:156) at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:811) at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:969) at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1281) at com.alibaba.otter.shared.common.utils.lock.BooleanMutex$Sync.innerGet(BooleanMutex.java:139) at com.alibaba.otter.shared.common.utils.lock.BooleanMutex.get(BooleanMutex.java:69) at com.alibaba.otter.node.etl.select.SelectTask.processSelect(SelectTask.java:265) at com.alibaba.otter.node.etl.select.SelectTask.access$300(SelectTask.java:94)

而ProcessTermin一直在等待termin信号，完成rollback的处理. 所以一个怀疑，就是termin信号丢了.

原提问者GitHub用户 agapple