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Posted to dev@kafka.apache.org by "Guozhang Wang (JIRA)" <ji...@apache.org> on 2017/05/13 00:05:05 UTC
[jira] [Resolved] (KAFKA-5198) RocksDbStore#openIterators should be
synchronized, since it is accessed from multiple threads
[ https://issues.apache.org/jira/browse/KAFKA-5198?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Guozhang Wang resolved KAFKA-5198.
----------------------------------
Resolution: Fixed
Fix Version/s: 0.11.0.0
Issue resolved by pull request 3000
[https://github.com/apache/kafka/pull/3000]
> RocksDbStore#openIterators should be synchronized, since it is accessed from multiple threads
> ---------------------------------------------------------------------------------------------
>
> Key: KAFKA-5198
> URL: https://issues.apache.org/jira/browse/KAFKA-5198
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Reporter: Colin P. McCabe
> Assignee: Colin P. McCabe
> Fix For: 0.11.0.0
>
>
> Currently, {{RocksDBIterator#close}} accesses {{RocksDbStore#openIterators}} without taking the {{RocksDbStore}} lock. The only lock {{RocksDBIterator#close}} holds is a lock on the iterator object, which does not help here. So {{RocksDbStore#openIterators}} should be made synchronized. Otherwise there is undefined behavior, including {{ConcurrentModificationExceptions}}.
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