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https://issues.apache.org/jira/browse/FLINK-6515?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16021344#comment-16021344
]
Yassine Marzougui commented on FLINK-6515:
------------------------------------------
Yes, I used flink.version=1.4-SNAPSHOT in the user code.
In addition, it looks like the fix
(https://github.com/apache/flink/commit/6f8022e35e0a49d5dfffa0ab7fd1c964b1c1bf0d
) didn't modify the kafka-connector code. And the exception I encountered is
actually from the new code
{code}Caused by: org.apache.flink.util.FlinkRuntimeException: Could not copy
element via serialization{code}
> 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
> Assignee: Stephan Ewen
> Priority: Blocker
> Fix For: 1.3.0, 1.4.0
>
>
> 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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