Patrick Lucas created FLINK-5801: ------------------------------------ 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] -- This message was sent by Atlassian JIRA (v6.3.15#6346)