[jira] [Created] (FLINK-6515) KafkaConsumer checkpointing fails because of ClassLoader issues

["Aljoscha Krettek (JIRA)" <ji...@apache.org>]

Aljoscha Krettek created FLINK-6515:
---------------------------------------

             Summary: KafkaConsumer checkpointing fails because of ClassLoader issues
                 Key: FLINK-6515
                 URL: https://issues.apache.org/jira/browse/FLINK-6515
             Project: Flink
          Issue Type: Bug
          Components: Kafka Connector
    Affects Versions: 1.3.0
            Reporter: Aljoscha Krettek
            Priority: Blocker
             Fix For: 1.3.0


A job with Kafka and checkpointing enabled fails with:
{code}
java.lang.Exception: Error while triggering checkpoint 1 for Source: Custom Source -> Map -> Sink: Unnamed (1/1)
	at org.apache.flink.runtime.taskmanager.Task$3.run(Task.java:1195)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.Exception: Could not perform checkpoint 1 for operator Source: Custom Source -> Map -> Sink: Unnamed (1/1).
	at org.apache.flink.streaming.runtime.tasks.StreamTask.triggerCheckpoint(StreamTask.java:526)
	at org.apache.flink.streaming.runtime.tasks.SourceStreamTask.triggerCheckpoint(SourceStreamTask.java:112)
	at org.apache.flink.runtime.taskmanager.Task$3.run(Task.java:1184)
	... 5 more
Caused by: java.lang.Exception: Could not complete snapshot 1 for operator Source: Custom Source -> Map -> Sink: Unnamed (1/1).
	at org.apache.flink.streaming.api.operators.AbstractStreamOperator.snapshotState(AbstractStreamOperator.java:407)
	at org.apache.flink.streaming.runtime.tasks.StreamTask$CheckpointingOperation.checkpointStreamOperator(StreamTask.java:1157)
	at org.apache.flink.streaming.runtime.tasks.StreamTask$CheckpointingOperation.executeCheckpointing(StreamTask.java:1089)
	at org.apache.flink.streaming.runtime.tasks.StreamTask.checkpointState(StreamTask.java:653)
	at org.apache.flink.streaming.runtime.tasks.StreamTask.performCheckpoint(StreamTask.java:589)
	at org.apache.flink.streaming.runtime.tasks.StreamTask.triggerCheckpoint(StreamTask.java:520)
	... 7 more
Caused by: java.lang.RuntimeException: Could not copy instance of (KafkaTopicPartition{topic='test-input', partition=0},-1).
	at org.apache.flink.runtime.state.JavaSerializer.copy(JavaSerializer.java:54)
	at org.apache.flink.runtime.state.JavaSerializer.copy(JavaSerializer.java:32)
	at org.apache.flink.runtime.state.ArrayListSerializer.copy(ArrayListSerializer.java:71)
	at org.apache.flink.runtime.state.DefaultOperatorStateBackend$PartitionableListState.<init>(DefaultOperatorStateBackend.java:368)
	at org.apache.flink.runtime.state.DefaultOperatorStateBackend$PartitionableListState.deepCopy(DefaultOperatorStateBackend.java:380)
	at org.apache.flink.runtime.state.DefaultOperatorStateBackend.snapshot(DefaultOperatorStateBackend.java:191)
	at org.apache.flink.streaming.api.operators.AbstractStreamOperator.snapshotState(AbstractStreamOperator.java:392)
	... 12 more
Caused by: java.lang.ClassNotFoundException: org.apache.flink.streaming.connectors.kafka.internals.KafkaTopicPartition
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$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 org.apache.flink.util.InstantiationUtil$ClassLoaderObjectInputStream.resolveClass(InstantiationUtil.java:64)
	at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1620)
	at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1521)
	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1781)
	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1353)
	at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2018)
	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1942)
	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1808)
	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1353)
	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:373)
	at org.apache.flink.util.InstantiationUtil.deserializeObject(InstantiationUtil.java:290)
	at org.apache.flink.util.InstantiationUtil.clone(InstantiationUtil.java:371)
	at org.apache.flink.util.InstantiationUtil.clone(InstantiationUtil.java:349)
	at org.apache.flink.runtime.state.JavaSerializer.copy(JavaSerializer.java:52)
	... 18 more

{code}

The problem seems to be {{TypeSerializer.copy()}}, which uses the wrong ClassLoader. Until recently this was not used but recent changes around asynchronous checkpointing of operator state require deep copies of the operator {{ListState}} and thus call this method.



--
This message was sent by Atlassian JIRA
(v6.3.15#6346)