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https://issues.apache.org/jira/browse/FLINK-6742?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16027473#comment-16027473
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Chesnay Schepler commented on FLINK-6742:
-----------------------------------------
We can improve the error message, but this is supposed to fail. When restoring
from a 1.2 savepoint in 1.3 the topology must not change as outlined in
https://ci.apache.org/projects/flink/flink-docs-release-1.3/ops/upgrading.html#application-topology.
Admittedly, we should make that more prominent.
Once you took a new 1.3 savepoint you can modify them at will again.
The {{allowNonRestoredState}} flag is ignored on purpose to prevent users from
violating the above requirement by accident.
> Savepoint conversion might fail if operators change
> ---------------------------------------------------
>
> Key: FLINK-6742
> URL: https://issues.apache.org/jira/browse/FLINK-6742
> Project: Flink
> Issue Type: Bug
> Components: State Backends, Checkpointing
> Affects Versions: 1.3.0
> Reporter: Gyula Fora
> Priority: Critical
>
> Caused by: java.lang.NullPointerException
> at
> org.apache.flink.runtime.checkpoint.savepoint.SavepointV2.convertToOperatorStateSavepointV2(SavepointV2.java:171)
> at
> org.apache.flink.runtime.checkpoint.savepoint.SavepointLoader.loadAndValidateSavepoint(SavepointLoader.java:75)
> at
> org.apache.flink.runtime.checkpoint.CheckpointCoordinator.restoreSavepoint(CheckpointCoordinator.java:1090)
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