[FLINK-2543] State handling does not support deserializing classes through the UserCodeClassloader

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 0.9, 0.10.0
• Fix Version/s: 0.10.0
• Assignee: Robert Metzger
• Reporter: Robert Metzger
• Created: 18/Aug/15 12:08
• Updated: 28/Feb/19 11:15
• Resolved: 30/Aug/15 18:47

Description

The current implementation of the state checkpointing does not support custom classes, because the UserCodeClassLoader is not used to deserialize the state.

Error: java.lang.RuntimeException: Failed to deserialize state handle and setup initial operator state.
at org.apache.flink.runtime.taskmanager.Task.run(Task.java:544)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ClassNotFoundException: com.ottogroup.bi.searchlab.searchsessionizer.OperatorState
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:626)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1613)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1518)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1774)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)
at org.apache.flink.runtime.state.ByteStreamStateHandle.getState(ByteStreamStateHandle.java:63)
at org.apache.flink.runtime.state.ByteStreamStateHandle.getState(ByteStreamStateHandle.java:33)
at org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.restoreInitialState(AbstractUdfStreamOperator.java:83)
at org.apache.flink.streaming.runtime.tasks.StreamTask.setInitialState(StreamTask.java:276)
at org.apache.flink.runtime.state.StateUtils.setOperatorState(StateUtils.java:51)
at org.apache.flink.runtime.taskmanager.Task.run(Task.java:541)

The issue has been reported by a user: http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/Custom-Class-for-state-checkpointing-td2415.html