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Posted to dev@kafka.apache.org by "Colin P. McCabe (JIRA)" <ji...@apache.org> on 2017/05/12 22:12:04 UTC

[jira] [Work started] (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 ]

Work on KAFKA-5198 started by Colin P. McCabe.
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> 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
>
> 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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