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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-5602) Migration with RocksDB job led to NPE for next checkpoint
Date Wed, 25 Jan 2017 10:25:27 GMT

    [ https://issues.apache.org/jira/browse/FLINK-5602?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15837540#comment-15837540
] 

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.
> [~stefanrichter83@gmail.com] 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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