[jira] [Created] (KAFKA-5198) RocksDbStore#openIterators should be synchronized, since it is accessed from multiple threads

[Colin P. McCabe (JIRA)]

Colin P. McCabe created KAFKA-5198:
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             Summary: 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
            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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