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https://issues.apache.org/jira/browse/FLINK-6690?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16022597#comment-16022597
]
Aljoscha Krettek commented on FLINK-6690:
-----------------------------------------
The most important thing is adding a test/ITCase that would have caught this
bug.
> Rescaling broken
> ----------------
>
> Key: FLINK-6690
> URL: https://issues.apache.org/jira/browse/FLINK-6690
> Project: Flink
> Issue Type: Bug
> Components: State Backends, Checkpointing
> Affects Versions: 1.3.0, 1.4.0
> Reporter: Chesnay Schepler
> Assignee: Stefan Richter
> Priority: Blocker
>
> Rescaling appears to be broken for both 1.3 and 1.4. WHen i tried it out i
> got the following exception:
> {code}
> java.lang.IllegalStateException: Could not initialize keyed state backend.
> at
> org.apache.flink.streaming.api.operators.AbstractStreamOperator.initKeyedState(AbstractStreamOperator.java:321)
> at
> org.apache.flink.streaming.api.operators.AbstractStreamOperator.initializeState(AbstractStreamOperator.java:217)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.initializeOperators(StreamTask.java:675)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.initializeState(StreamTask.java:662)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:251)
> at org.apache.flink.runtime.taskmanager.Task.run(Task.java:702)
> at java.lang.Thread.run(Thread.java:745) Caused by:
> java.lang.IndexOutOfBoundsException: Index: 0, Size: 0 at
> java.util.ArrayList.rangeCheck(ArrayList.java:635) at
> java.util.ArrayList.get(ArrayList.java:411) at
> org.apache.flink.contrib.streaming.state.RocksDBKeyedStateBackend$RocksDBFullRestoreOperation.restoreKVStateData(RocksDBKeyedStateBackend.java:1183)
> at
> org.apache.flink.contrib.streaming.state.RocksDBKeyedStateBackend$RocksDBFullRestoreOperation.restoreKeyGroupsInStateHandle(RocksDBKeyedStateBackend.java:1089)
> at
> org.apache.flink.contrib.streaming.state.RocksDBKeyedStateBackend$RocksDBFullRestoreOperation.doRestore(RocksDBKeyedStateBackend.java:1070)
> at
> org.apache.flink.contrib.streaming.state.RocksDBKeyedStateBackend.restore(RocksDBKeyedStateBackend.java:957)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.createKeyedStateBackend(StreamTask.java:771)
> at
> org.apache.flink.streaming.api.operators.AbstractStreamOperator.initKeyedState(AbstractStreamOperator.java:311)
> ... 6 more
> {code}
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