+1 for a more helpful error message.
@Jacob Would you mind opening a JIRA issue at
https://issues.apache.org/jira/browse/FLINK?
On Thu, Jun 23, 2016 at 11:31 AM, Chesnay Schepler <ches...@apache.org> wrote:
> We should adjust the error message to contain the keyed stream thingy.
>
>
> On 23.06.2016 10:11, Till Rohrmann wrote:
>
> Hi Jacob,
>
> the `ListState` abstraction is a state which we call partitioned/key-value
> state. As such, it is only possible to use it with a keyed stream. This
> means that you have to call `keyBy` after the `connect` API call.
>
> Cheers,
> Till
>
> On Wed, Jun 22, 2016 at 9:17 PM, Jacob Bay Larsen <m...@jacobbay.dk> wrote:
>>
>> Hi,
>>
>> I am trying to use a ListState in a RichCoFlatMapFunction but when
>> calling: getRuntimeContext().getListState(descriptor) in the open-function i
>> am getting a "State key serializer has not .." exception. I am not sure what
>> i can do to avoid this exception - Are any of you able to provide some help
>> ?
>>
>> Best regards
>> Jacob
>>
>>
>> private ListState<Tuple2<String, Integer>> deltaPositions;
>>
>> @Override
>> public void open(org.apache.flink.configuration.Configuration
>> parameters) throws Exception {
>> // Create state variable
>> ListStateDescriptor<Tuple2<String, Integer>> descriptor =
>> new ListStateDescriptor<>(
>> "deltaPositions", // the state name
>> TypeInformation.of(new TypeHint<Tuple2<String,
>> Integer>>() {
>> }));
>>
>> deltaPositions = getRuntimeContext().getListState(descriptor);
>> };
>>
>>
>>
>> 2016-06-22 20:41:38,813 INFO org.apache.flink.runtime.taskmanager.Task
>> - Stream of Items with collection of meadian times (1/1) switched to FAILED
>> with exception.
>> java.lang.RuntimeException: Error while getting state
>> at
>> org.apache.flink.streaming.api.operators.StreamingRuntimeContext.getListState(StreamingRuntimeContext.java:131)
>> at
>> crisplant.bigdata.dataanalysis.baggagemonitor.streaming.liveitemeventsstoring.LiveItemEventsStoring$MergeMedianTimesFlatMapFunction.open(LiveItemEventsStoring.java:83)
>> at
>> org.apache.flink.api.common.functions.util.FunctionUtils.openFunction(FunctionUtils.java:38)
>> at
>> org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.open(AbstractUdfStreamOperator.java:91)
>> at
>> org.apache.flink.streaming.api.operators.co.CoStreamFlatMap.open(CoStreamFlatMap.java:49)
>> at
>> org.apache.flink.streaming.runtime.tasks.StreamTask.openAllOperators(StreamTask.java:317)
>> at
>> org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:215)
>> at org.apache.flink.runtime.taskmanager.Task.run(Task.java:559)
>> at java.lang.Thread.run(Thread.java:745)
>> Caused by: java.lang.Exception: State key serializer has not been
>> configured in the config. This operation cannot use partitioned state.
>> at
>> org.apache.flink.runtime.state.AbstractStateBackend.getPartitionedState(AbstractStateBackend.java:199)
>> at
>> org.apache.flink.streaming.api.operators.AbstractStreamOperator.getPartitionedState(AbstractStreamOperator.java:260)
>> at
>> org.apache.flink.streaming.api.operators.StreamingRuntimeContext.getListState(StreamingRuntimeContext.java:129)
>> ... 8 more
>> 2016-06-22 20:41:38,815 INFO org.apache.flink.runtime.taskmanager.Task
>> - Freeing ta
>>
>> --
>> Jacob Bay Larsen
>>
>> Phone: +45 6133 1108
>> E-mail: m...@jacobbay.dk
>
>
>
