你好，这个参数我没有设置过，对于checkpoint，我只是设置了rockDB增量写入，其他都没有设置了
athlon...@gmail.com <athlon...@gmail.com> 于2019年7月25日周四 下午6:20写道： > setMaxConcurrentCheckpoints 这个参数你设置过么? > > > > athlon...@gmail.com > > 发件人： 戴嘉诚 > 发送时间： 2019-07-25 18:07 > 收件人： user-zh > 主题： Flink checkpoint 并发问题 > 大家好： > > 我这里有个Job，会经常不定时的挂掉重启，具体的异常日志为一下，大致是checkpoint的同步失败的 > > > 在这个job中，具体是查询最近半小时的数据量是否达到配置的阈值，我使用了rockDB作为后端，然后中间会有个processElement方法会把Key出来的消息，在内部中的MapState堆积，同时也会每条消息过来，就遍历一遍MapState，来删除其中过时的数据。 > > > > 这个异常是不是我在ProcessElement方法内对MapState进行删除的过程中，checkpoint异步复制这个state到rockDB导致的？ > > > java.lang.Exception: Could not perform checkpoint 550 for operator > KeyedProcess -> async wait operator -> Flat Map -> Sink: 写入redis库存 > (16/20). > > at > org.apache.flink.streaming.runtime.tasks.StreamTask.triggerCheckpointOnBarrier(StreamTask.java:595) > > at > org.apache.flink.streaming.runtime.io.BarrierBuffer.notifyCheckpoint(BarrierBuffer.java:396) > > at > org.apache.flink.streaming.runtime.io.BarrierBuffer.processBarrier(BarrierBuffer.java:292) > > at > org.apache.flink.streaming.runtime.io.BarrierBuffer.getNextNonBlocked(BarrierBuffer.java:200) > > at org.apache.flink.streaming.runtime.io > .StreamInputProcessor.processInput(StreamInputProcessor.java:209) > > at > org.apache.flink.streaming.runtime.tasks.OneInputStreamTask.run(OneInputStreamTask.java:105) > > at > org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:300) > > at org.apache.flink.runtime.taskmanager.Task.run(Task.java:711) > > at java.lang.Thread.run(Thread.java:748) > > Caused by: java.lang.Exception: Could not complete snapshot 550 for > operator KeyedProcess -> async wait operator -> Flat Map -> Sink: > 写入redis库存 (16/20). > > at > org.apache.flink.streaming.api.operators.AbstractStreamOperator.snapshotState(AbstractStreamOperator.java:422) > > at > org.apache.flink.streaming.runtime.tasks.StreamTask$CheckpointingOperation.checkpointStreamOperator(StreamTask.java:1113) > > at > org.apache.flink.streaming.runtime.tasks.StreamTask$CheckpointingOperation.executeCheckpointing(StreamTask.java:1055) > > at > org.apache.flink.streaming.runtime.tasks.StreamTask.checkpointState(StreamTask.java:729) > > at > org.apache.flink.streaming.runtime.tasks.StreamTask.performCheckpoint(StreamTask.java:641) > > at > org.apache.flink.streaming.runtime.tasks.StreamTask.triggerCheckpointOnBarrier(StreamTask.java:586) > > ... 8 more > > Caused by: java.util.ConcurrentModificationException > > at java.util.HashMap$HashIterator.nextNode(HashMap.java:1442) > > at java.util.HashMap$EntryIterator.next(HashMap.java:1476) > > at java.util.HashMap$EntryIterator.next(HashMap.java:1474) > > at > com.esotericsoftware.kryo.serializers.MapSerializer.copy(MapSerializer.java:156) > > at > com.esotericsoftware.kryo.serializers.MapSerializer.copy(MapSerializer.java:21) > > at com.esotericsoftware.kryo.Kryo.copy(Kryo.java:862) > > at > org.apache.flink.api.java.typeutils.runtime.kryo.KryoSerializer.copy(KryoSerializer.java:248) > > at > org.apache.flink.streaming.runtime.streamrecord.StreamElementSerializer.copy(StreamElementSerializer.java:105) > > at > org.apache.flink.streaming.runtime.streamrecord.StreamElementSerializer.copy(StreamElementSerializer.java:46) > > at > org.apache.flink.runtime.state.ArrayListSerializer.copy(ArrayListSerializer.java:73) > > at > org.apache.flink.runtime.state.PartitionableListState.<init>(PartitionableListState.java:68) > > at > org.apache.flink.runtime.state.PartitionableListState.deepCopy(PartitionableListState.java:80) > > at > org.apache.flink.runtime.state.DefaultOperatorStateBackendSnapshotStrategy.snapshot(DefaultOperatorStateBackendSnapshotStrategy.java:88) > > at > org.apache.flink.runtime.state.DefaultOperatorStateBackend.snapshot(DefaultOperatorStateBackend.java:261) > > at > org.apache.flink.streaming.api.operators.AbstractStreamOperator.snapshotState(AbstractStreamOperator.java:402) > > ... 13 more >
