[jira] [Created] (FLINK-5602) Migration with RocksDB job led to NPE for next checkpoint

[Shang Yuanchun (Jira)]

Ufuk Celebi created FLINK-5602:
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             Summary: 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


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.

[~[hidden email]] 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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