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.
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