[KAFKA-6878] NPE when querying global state store not in READY state

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.1.0
• Fix Version/s: 1.1.1, 2.0.0
• Component/s: streams
• Assignee: Unassigned
• Reporter: Salazar
• Created: 07/May/18 23:48
• Updated: 10/May/18 00:08
• Resolved: 10/May/18 00:08

Description

Info: using kafka 1.1.0 - confluent 4.1.0

We're trying to query a global state store, but if we query too quickly after the application is started we get a NullPointerException(CachingKeyValueStore.java:166).

We have verified the key is nonNull.

If we wait long enough (with our current amount of data 5 minutes after start) we get an answer but before then we get NPEs.

 

Looks like there isn't a check to ensure `initInternal` actually sets the cache before you're allowed to use it in the get method

 

stacktrace:

java.lang.NullPointerException: null
at org.apache.kafka.streams.state.internals.CachingKeyValueStore.getInternal(CachingKeyValueStore.java:166)
at org.apache.kafka.streams.state.internals.CachingKeyValueStore.get(CachingKeyValueStore.java:159)
at org.apache.kafka.streams.state.internals.CachingKeyValueStore.get(CachingKeyValueStore.java:38)
at org.apache.kafka.streams.state.internals.InnerMeteredKeyValueStore.get(InnerMeteredKeyValueStore.java:183)
at org.apache.kafka.streams.state.internals.MeteredKeyValueBytesStore.get(MeteredKeyValueBytesStore.java:112)
at org.apache.kafka.streams.state.internals.CompositeReadOnlyKeyValueStore.get(CompositeReadOnlyKeyValueStore.java:55)
at io.repository.VisitRepositoryKafka.findByVisitTrackingId(VisitRepositoryKafka.java:76)

Issue Links

• links to: GitHub Pull Request #4978
• links to: GitHub Pull Request #4988