You are viewing a plain text version of this content. The canonical link for it is here.
Posted to jira@kafka.apache.org by "Damian Guy (JIRA)" <ji...@apache.org> on 2018/01/31 10:25:00 UTC
[jira] [Updated] (KAFKA-6378) NullPointerException on
KStream-GlobalKTable leftJoin when KeyValueMapper returns null
[ https://issues.apache.org/jira/browse/KAFKA-6378?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Damian Guy updated KAFKA-6378:
------------------------------
Fix Version/s: (was: 1.1.0)
1.0.1
> NullPointerException on KStream-GlobalKTable leftJoin when KeyValueMapper returns null
> --------------------------------------------------------------------------------------
>
> Key: KAFKA-6378
> URL: https://issues.apache.org/jira/browse/KAFKA-6378
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 1.0.0
> Reporter: Andy Bryant
> Priority: Major
> Fix For: 1.0.1
>
>
> On a Stream->GlobalKTable leftJoin if the KeyValueMapper returns null, the stream fails with a NullPointerException (see stacktrace below). On Kafka 0.11.0.0 the stream processes this successfully, calling the ValueJoiner with the table value set to null.
> The use-case for this is joining a stream to a table containing reference data where the stream foreign key may be null. There is no straight-forward workaround in this case with Kafka 1.0.0 without having to resort to either generating a key that will never match or branching the stream for records that don't have the foreign key.
> Exception in thread "workshop-simple-example-client-StreamThread-1" java.lang.NullPointerException
> at java.base/java.util.Objects.requireNonNull(Objects.java:221)
> at org.apache.kafka.streams.state.internals.CachingKeyValueStore.get(CachingKeyValueStore.java:136)
> at org.apache.kafka.streams.state.internals.CachingKeyValueStore.get(CachingKeyValueStore.java:35)
> at org.apache.kafka.streams.state.internals.InnerMeteredKeyValueStore.get(InnerMeteredKeyValueStore.java:184)
> at org.apache.kafka.streams.state.internals.MeteredKeyValueBytesStore.get(MeteredKeyValueBytesStore.java:116)
> at org.apache.kafka.streams.kstream.internals.KTableSourceValueGetterSupplier$KTableSourceValueGetter.get(KTableSourceValueGetterSupplier.java:49)
> at org.apache.kafka.streams.kstream.internals.KStreamKTableJoinProcessor.process(KStreamKTableJoinProcessor.java:56)
> at org.apache.kafka.streams.processor.internals.ProcessorNode$1.run(ProcessorNode.java:46)
> at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:208)
> at org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:124)
> at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:85)
> at org.apache.kafka.streams.processor.internals.SourceNode.process(SourceNode.java:80)
> at org.apache.kafka.streams.processor.internals.StreamTask.process(StreamTask.java:216)
> at org.apache.kafka.streams.processor.internals.AssignedTasks.process(AssignedTasks.java:403)
> at org.apache.kafka.streams.processor.internals.TaskManager.process(TaskManager.java:317)
> at org.apache.kafka.streams.processor.internals.StreamThread.processAndMaybeCommit(StreamThread.java:942)
> at org.apache.kafka.streams.processor.internals.StreamThread.runOnce(StreamThread.java:822)
> at org.apache.kafka.streams.processor.internals.StreamThread.runLoop(StreamThread.java:774)
> at org.apache.kafka.streams.processor.internals.StreamThread.run(StreamThread.java:744)
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)