[jira] [Created] (FLINK-5801) Queryable State from Scala job/client fails with key of type Long

["Patrick Lucas (JIRA)" <ji...@apache.org>]

Patrick Lucas created FLINK-5801:
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             Summary: Queryable State from Scala job/client fails with key of type Long
                 Key: FLINK-5801
                 URL: https://issues.apache.org/jira/browse/FLINK-5801
             Project: Flink
          Issue Type: Bug
          Components: Queryable State
    Affects Versions: 1.2.0
         Environment: Flink 1.2.0
Scala 2.10
            Reporter: Patrick Lucas
         Attachments: OrderFulfillment.scala, OrderFulfillmentStateQuery.scala

While working on a demo Flink job, to try out Queryable State, I exposed some state of type Long -> custom class via the Query server. However, the query server returned an exception when I tried to send a query:

{noformat}
Exception in thread "main" java.lang.RuntimeException: Failed to query state backend for query 0. Caused by: java.io.IOException: Unable to deserialize key and namespace. This indicates a mismatch in the key/namespace serializers used by the KvState instance and this access.
	at org.apache.flink.runtime.query.netty.message.KvStateRequestSerializer.deserializeKeyAndNamespace(KvStateRequestSerializer.java:392)
	at org.apache.flink.runtime.state.heap.AbstractHeapState.getSerializedValue(AbstractHeapState.java:130)
	at org.apache.flink.runtime.query.netty.KvStateServerHandler$AsyncKvStateQueryTask.run(KvStateServerHandler.java:220)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.io.EOFException
	at org.apache.flink.runtime.util.DataInputDeserializer.readLong(DataInputDeserializer.java:217)
	at org.apache.flink.api.common.typeutils.base.LongSerializer.deserialize(LongSerializer.java:69)
	at org.apache.flink.api.common.typeutils.base.LongSerializer.deserialize(LongSerializer.java:27)
	at org.apache.flink.runtime.query.netty.message.KvStateRequestSerializer.deserializeKeyAndNamespace(KvStateRequestSerializer.java:379)
	... 7 more

	at org.apache.flink.runtime.query.netty.KvStateServerHandler$AsyncKvStateQueryTask.run(KvStateServerHandler.java:257)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)
{noformat}

I banged my head against this for a while, then per [~jgrier]'s suggestion I tried simply changing the key from Long to String (modifying the two {{keyBy}} calls and the {{keySerializer}} {{TypeHint}} in the attached code) and it started working perfectly.

cc [~uce]



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