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https://issues.apache.org/jira/browse/FLINK-5602?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15837540#comment-15837540
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ASF GitHub Bot commented on FLINK-5602:
---------------------------------------
Github user StefanRRichter commented on the issue:
https://github.com/apache/flink/pull/3200
Thanks for the review @uce ! I changed my PR according to your suggestions
(except for only throwing an unsupported op exception on the duplicate
function).
> Migration with RocksDB job led to NPE for next checkpoint
> ---------------------------------------------------------
>
> Key: FLINK-5602
> URL: https://issues.apache.org/jira/browse/FLINK-5602
> Project: Flink
> Issue Type: Bug
> Reporter: Ufuk Celebi
> Assignee: Stefan Richter
>
> When migrating a job with RocksDB I got the following Exception when the next
> checkpoint was triggered. This only happened once and I could not reproduce
> it ever since.
> [[email protected]] Maybe we can look over the code and check what
> could have failed here? I unfortunately don't have more available of the
> stack trace. I don't think that this will be very helpful will it?
> {code}
> at
> org.apache.flink.util.Preconditions.checkNotNull(Preconditions.java:58)
> at
> org.apache.flink.runtime.state.KeyedBackendSerializationProxy$StateMetaInfo.<init>(KeyedBackendSerializationProxy.java:126)
> at
> org.apache.flink.contrib.streaming.state.RocksDBKeyedStateBackend$RocksDBSnapshotOperation.writeKVStateMetaData(RocksDBKeyedStateBackend.java:471)
> at
> org.apache.flink.contrib.streaming.state.RocksDBKeyedStateBackend$RocksDBSnapshotOperation.writeDBSnapshot(RocksDBKeyedStateBackend.java:382)
> at
> org.apache.flink.contrib.streaming.state.RocksDBKeyedStateBackend$1.performOperation(RocksDBKeyedStateBackend.java:280)
> at
> org.apache.flink.contrib.streaming.state.RocksDBKeyedStateBackend$1.performOperation(RocksDBKeyedStateBackend.java:262)
> at
> org.apache.flink.runtime.io.async.AbstractAsyncIOCallable.call(AbstractAsyncIOCallable.java:72)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at
> org.apache.flink.util.FutureUtil.runIfNotDoneAndGet(FutureUtil.java:37)
> ... 6 more
> {code}
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