有时会引发此错误并转到任务管理器。我使用了org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.jsonnode
WARN org.apache.flink.api.java.typeutils.runtime.kryo.KryoSerializer - Falling back to default Kryo serializer because Chill serializer couldn't be found.
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.flink.api.java.typeutils.runtime.kryo.KryoSerializer.getKryoInstance(KryoSerializer.java:436)
at org.apache.flink.api.java.typeutils.runtime.kryo.KryoSerializer.checkKryoInitialized(KryoSerializer.java:454)
at org.apache.flink.api.java.typeutils.runtime.kryo.KryoSerializer.deserialize(KryoSerializer.java:337)
at org.apache.flink.api.common.typeutils.CompositeSerializer.deserialize(CompositeSerializer.java:151)
at org.apache.flink.contrib.streaming.state.ttl.RocksDbTtlCompactFiltersManager$ListElementFilter.nextElementLastAccessTimestamp(RocksDbTtlCompactFiltersManager.java:202)
at org.apache.flink.contrib.streaming.state.ttl.RocksDbTtlCompactFiltersManager$ListElementFilter.nextUnexpiredOffset(RocksDbTtlCompactFiltersManager.java:189)
Caused by: java.lang.ClassNotFoundException: scala/Function0
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at com.twitter.chill.KryoBase.$anonfun$functions$1(KryoBase.scala:41)
at com.twitter.chill.KryoBase.$anonfun$functions$1$adapted(KryoBase.scala:41)
at scala.collection.TraversableLike.$anonfun$map$1(TraversableLike.scala:233)
at scala.collection.immutable.Range.foreach(Range.scala:155)
at scala.collection.TraversableLike.map(TraversableLike.scala:233)
at scala.collection.TraversableLike.map$(TraversableLike.scala:226)
at scala.collection.AbstractTraversable.map(Traversable.scala:104)
at com.twitter.chill.KryoBase.<init>(KryoBase.scala:41)
at org.apache.flink.runtime.types.EmptyFlinkScalaKryoInstantiator.newKryo(FlinkScalaKryoInstantiator.scala:45)
at org.apache.flink.runtime.types.FlinkScalaKryoInstantiator.newKryo(FlinkScalaKryoInstantiator.scala:82)
... 10 more
Exception in thread "Thread-9" java.lang.IllegalArgumentException: classLoader cannot be null.
at com.esotericsoftware.kryo.Kryo.setClassLoader(Kryo.java:975)
at org.apache.flink.api.java.typeutils.runtime.kryo.KryoSerializer.checkKryoInitialized(KryoSerializer.java:477)
at org.apache.flink.api.java.typeutils.runtime.kryo.KryoSerializer.deserialize(KryoSerializer.java:337)
at org.apache.flink.api.common.typeutils.CompositeSerializer.deserialize(CompositeSerializer.java:151)
at org.apache.flink.contrib.streaming.state.ttl.RocksDbTtlCompactFiltersManager$ListElementFilter.nextElementLastAccessTimestamp(RocksDbTtlCompactFiltersManager.java:202)
at org.apache.flink.contrib.streaming.state.ttl.RocksDbTtlCompactFiltersManager$ListElementFilter.nextUnexpiredOffset(RocksDbTtlCompactFiltersManager.java:189)
1条答案
按热度按时间1hdlvixo1#
这可能是在本机压缩线程的上下文中没有用户类加载器的问题。
作为一种解决方法，我建议对简单元素使用列表状态，该类型在序列化时具有固定的字节长度。这将是基本类型和pojo，如果可能的话，可能实现一个定制的固定长度序列化程序。那么kryo序列化程序就不必在ttl清理中调用，并且需要用户类加载器。