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https://issues.apache.org/jira/browse/KAFKA-13971?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kvicii.Yu reassigned KAFKA-13971:
---------------------------------
Assignee: Kvicii.Yu
> Atomicity violations caused by improper usage of ConcurrentHashMap
> ------------------------------------------------------------------
>
> Key: KAFKA-13971
> URL: https://issues.apache.org/jira/browse/KAFKA-13971
> Project: Kafka
> Issue Type: Bug
> Reporter: Divij Vaidya
> Assignee: Kvicii.Yu
> Priority: Minor
> Labels: newbee, newbie
>
> *Code:*
> [https://github.com/apache/kafka/blob/trunk/connect/runtime/src/main/java/org/apache/kafka/connect/runtime/WorkerConfigTransformer.java#L81-L84]
>
> *Problem*
> We are using a {{{}ConcurrentHashMap{}}}, but usage of {{{}get(){}}},
> {{null}} check, and {{put()}} may not be thread-safe at lines: 81, 82, and
> 84. Two threads can perform this same check at the same time and one thread
> can overwrite the value written by the other thread.
> *Fix*
> Consider replacing {{put()}} with {{putIfAbsent()}} to help prevent
> accidental overwriting. {{putIfAbsent()}} puts the value only if the
> {{ConcurrentHashMap}} does not contain the key and therefore avoids
> overwriting the value written there by the other thread's
> {{{}putIfAbsent(){}}}.
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