[jira] [Resolved] (KAFKA-4492) java.lang.IllegalStateException: Attempting to put a clean entry for key... into NamedCache

["Damian Guy (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-4492?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Damian Guy resolved KAFKA-4492.
-------------------------------
    Resolution: Fixed

> java.lang.IllegalStateException: Attempting to put a clean entry for key... into NamedCache
> -------------------------------------------------------------------------------------------
>
>                 Key: KAFKA-4492
>                 URL: https://issues.apache.org/jira/browse/KAFKA-4492
>             Project: Kafka
>          Issue Type: Bug
>          Components: streams
>    Affects Versions: 0.10.1.0
>            Reporter: Damian Guy
>            Assignee: Damian Guy
>             Fix For: 0.10.2.0
>
>
> This follows on from https://issues.apache.org/jira/browse/KAFKA-4311
> The exception seems to be triggered by topologies with multiple joined tables. As a new record arrives in one table it triggers an eviction. The eviction causes a flush which will trigger a join processor. These in-turn does a cache lookup and if the value is not in the cache, then it will be retrieved from the store and put in the cache, triggering another eviction. And so on.
> Exception reported on mailing list
> https://gist.github.com/mfenniak/509fb82dfcfda79a21cfc1b07dafa89c
> Further investigation into this also reveals that this same eviction process can send the cache eviction into an infinite loop. It seems that the LRU is broken.



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