[jira] [Created] (FLINK-13541) State Processor Api sets the wrong key selector when writing savepoints

["Seth Wiesman (JIRA)" <ji...@apache.org>]

Seth Wiesman created FLINK-13541:
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             Summary: State Processor Api sets the wrong key selector when writing savepoints
                 Key: FLINK-13541
                 URL: https://issues.apache.org/jira/browse/FLINK-13541
             Project: Flink
          Issue Type: Bug
          Components: API / DataStream, Runtime / State Backends
            Reporter: Seth Wiesman
             Fix For: 1.9.0, 1.10.0


The state processor api is setting the wrong key selector for its StreamConfig when writing savepoints. It uses two key selectors internally that happen to output the same value for integer keys but not in general. 


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Caused by: java.lang.RuntimeException: Exception occurred while setting the current key context.
	at org.apache.flink.streaming.api.operators.AbstractStreamOperator.setCurrentKey(AbstractStreamOperator.java:641)
	at org.apache.flink.streaming.api.operators.AbstractStreamOperator.setKeyContextElement(AbstractStreamOperator.java:627)
	at org.apache.flink.streaming.api.operators.AbstractStreamOperator.setKeyContextElement1(AbstractStreamOperator.java:615)
	at org.apache.flink.state.api.output.BoundedStreamTask.performDefaultAction(BoundedStreamTask.java:83)
	at org.apache.flink.streaming.runtime.tasks.mailbox.execution.MailboxProcessor.runMailboxLoop(MailboxProcessor.java:140)
	at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:378)
	at org.apache.flink.state.api.output.BoundedOneInputStreamTaskRunner.mapPartition(BoundedOneInputStreamTaskRunner.java:76)
	at org.apache.flink.runtime.operators.MapPartitionDriver.run(MapPartitionDriver.java:103)
	at org.apache.flink.runtime.operators.BatchTask.run(BatchTask.java:504)
	at org.apache.flink.runtime.operators.BatchTask.invoke(BatchTask.java:369)
	at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:688)
	at org.apache.flink.runtime.taskmanager.Task.run(Task.java:518)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String
	at org.apache.flink.api.common.typeutils.base.StringSerializer.serialize(StringSerializer.java:33)
	at org.apache.flink.contrib.streaming.state.RocksDBSerializedCompositeKeyBuilder.serializeKeyGroupAndKey(RocksDBSerializedCompositeKeyBuilder.java:159)
	at org.apache.flink.contrib.streaming.state.RocksDBSerializedCompositeKeyBuilder.setKeyAndKeyGroup(RocksDBSerializedCompositeKeyBuilder.java:96)
	at org.apache.flink.contrib.streaming.state.RocksDBKeyedStateBackend.setCurrentKey(RocksDBKeyedStateBackend.java:303)
	at org.apache.flink.streaming.api.operators.AbstractStreamOperator.setCurrentKey(AbstractStreamOperator.java:639)
	... 12 more

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