Details
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Bug
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Status: Resolved
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Major
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Resolution: Fixed
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1.5.0, 1.6.0
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None
Description
When you are using custom `TypeSerializer` instances implemented in Scala, the Scala issue SI-2034 can manifest itself when a Flink job is restored from checkpoint or started with a savepoint.
The reason is that in such a restore from checkpoint or savepoint, Flink uses `InstantiationUtil.FailureTolerantObjectInputStream` to deserialize the type serializers and their configurations. The deserialization walks through the entire object graph corresponding, and for each class it calls `isAnonymousClass`, which, in turn, calls `getSimpleName` (mechanism in place for FLINK-6869). If there is an internal class defined in a Scala object for which `getSimpleName` fails (see the Scala issue), then a `java.lang.InternalError` is thrown which causes the task manager to restart. In this case, Flink tries to restart the job on another task manager, causing all the task managers to restart, wreaking havoc on the entire Flink cluster.
There are some alternative type information derivation mechanisms that rely on anonymous classes and, most importantly, classes generated by macros, that can easily trigger the above problem. I am personally working on https://github.com/zsolt-donca/flink-alt, and there is also https://github.com/joroKr21/flink-shapeless
I prepared a pull request that fixes the issue.
Edit: added a stack trace to help demonstrate the issue.
2018-06-21 13:08:07.829 [today-stats (2/2)] ERROR org.apache.flink.runtime.taskmanager.Task - Encountered fatal error java.lang.InternalError - terminating the JVM
java.lang.InternalError: Malformed class name
at java.lang.Class.getSimpleName(Class.java:1330) ~[na:1.8.0_171]
at java.lang.Class.isAnonymousClass(Class.java:1411) ~[na:1.8.0_171]
at org.apache.flink.util.InstantiationUtil$FailureTolerantObjectInputStream.readClassDescriptor(InstantiationUtil.java:206) ~[flink-dist_2.11-1.4.2.jar:1.4.2]
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1855) ~[na:1.8.0_171]
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1749) ~[na:1.8.0_171]
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2040) ~[na:1.8.0_171]
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1571) ~[na:1.8.0_171]
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2285) ~[na:1.8.0_171]
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2209) ~[na:1.8.0_171]
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2067) ~[na:1.8.0_171]
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1571) ~[na:1.8.0_171]
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2285) ~[na:1.8.0_171]
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2209) ~[na:1.8.0_171]
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2067) ~[na:1.8.0_171]
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1571) ~[na:1.8.0_171]
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:431) ~[na:1.8.0_171]
at org.apache.flink.api.common.typeutils.TypeSerializerSerializationUtil$TypeSerializerSerializationProxy.read(TypeSerializerSerializationUtil.java:375) ~[flink-dist_2.11-1.4.2.jar:1.4.2]
at org.apache.flink.api.common.typeutils.TypeSerializerSerializationUtil.tryReadSerializer(TypeSerializerSerializationUtil.java:110) ~[flink-dist_2.11-1.4.2.jar:1.4.2]
at org.apache.flink.api.common.typeutils.TypeSerializerSerializationUtil.tryReadSerializer(TypeSerializerSerializationUtil.java:83) ~[flink-dist_2.11-1.4.2.jar:1.4.2]
at org.apache.flink.api.common.typeutils.TypeSerializerSerializationUtil.readSerializersAndConfigsWithResilience(TypeSerializerSerializationUtil.java:203) ~[flink-dist_2.11-1.4.2.jar:1.4.2]
at org.apache.flink.runtime.state.KeyedBackendSerializationProxy.read(KeyedBackendSerializationProxy.java:138) ~[flink-dist_2.11-1.4.2.jar:1.4.2]
at org.apache.flink.runtime.state.heap.HeapKeyedStateBackend.restorePartitionedState(HeapKeyedStateBackend.java:480) ~[flink-dist_2.11-1.4.2.jar:1.4.2]
at org.apache.flink.runtime.state.heap.HeapKeyedStateBackend.restore(HeapKeyedStateBackend.java:446) ~[flink-dist_2.11-1.4.2.jar:1.4.2]
at org.apache.flink.streaming.runtime.tasks.StreamTask.createKeyedStateBackend(StreamTask.java:773) ~[flink-dist_2.11-1.4.2.jar:1.4.2]
at org.apache.flink.streaming.api.operators.AbstractStreamOperator.initKeyedState(AbstractStreamOperator.java:282) ~[flink-dist_2.11-1.4.2.jar:1.4.2]
at org.apache.flink.streaming.api.operators.AbstractStreamOperator.initializeState(AbstractStreamOperator.java:224) ~[flink-dist_2.11-1.4.2.jar:1.4.2]
at org.apache.flink.streaming.runtime.tasks.StreamTask.initializeOperators(StreamTask.java:692) ~[flink-dist_2.11-1.4.2.jar:1.4.2]
at org.apache.flink.streaming.runtime.tasks.StreamTask.initializeState(StreamTask.java:679) ~[flink-dist_2.11-1.4.2.jar:1.4.2]
at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:253) ~[flink-dist_2.11-1.4.2.jar:1.4.2]
at org.apache.flink.runtime.taskmanager.Task.run(Task.java:718) ~[flink-dist_2.11-1.4.2.jar:1.4.2]
at java.lang.Thread.run(Thread.java:748) [na:1.8.0_171]
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