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From "Matthias J. Sax (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (KAFKA-5198) RocksDbStore#openIterators should be synchronized, since it is accessed from multiple threads
Date Mon, 08 May 2017 22:32:04 GMT

     [ https://issues.apache.org/jira/browse/KAFKA-5198?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Matthias J. Sax updated KAFKA-5198:
-----------------------------------
    Component/s: streams

> 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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