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Date: Wed, 9 Aug 2017 13:02:00 +0000 (UTC)
From: "Damian Guy (JIRA)" <jira@apache.org>
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Subject: [jira] [Assigned] (KAFKA-5717) [streams] 'null' values in state
 stores
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archived-at: Wed, 09 Aug 2017 13:02:04 -0000


     [ https://issues.apache.org/jira/browse/KAFKA-5717?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Damian Guy reassigned KAFKA-5717:
---------------------------------

    Assignee: Damian Guy

> [streams] 'null' values in state stores
> ---------------------------------------
>
>                 Key: KAFKA-5717
>                 URL: https://issues.apache.org/jira/browse/KAFKA-5717
>             Project: Kafka
>          Issue Type: Bug
>          Components: streams
>    Affects Versions: 0.10.2.1, 0.11.0.0
>            Reporter: Bart Vercammen
>            Assignee: Damian Guy
>
> When restoring the state on an in-memory KeyValue store (at startup of the Kafka Streams application), the _deleted_ values are put in the store as _key_ with _value_ {{null}} instead of being removed from the store.
> (this happens when the underlying kafka topic segment did not get compacted yet)
> After some digging I came across this in {{InMemoryKeyValueStore<K, V>}}:
> {code}
> public synchronized void put(K key, V value) {
>         this.map.put(key, value);
>     }
> {code}
> I would assume this implementation misses the check on {{value}} being {{null}} to *delete* the entry instead of just storing it.
> In the RocksDB implementation it is done correctly:
> {code}
> if (rawValue == null) {
>             try {
>                 db.delete(wOptions, rawKey);
> {code}


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