[
https://issues.apache.org/jira/browse/KAFKA-6131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16221583#comment-16221583
]
ASF GitHub Bot commented on KAFKA-6131:
---------------------------------------
Github user asfgit closed the pull request at:
https://github.com/apache/kafka/pull/4140
> Transaction markers are sometimes discarded if txns complete concurrently
> -------------------------------------------------------------------------
>
> Key: KAFKA-6131
> URL: https://issues.apache.org/jira/browse/KAFKA-6131
> Project: Kafka
> Issue Type: Bug
> Components: core
> Affects Versions: 1.0.0
> Reporter: Rajini Sivaram
> Assignee: Rajini Sivaram
>
> Concurrent tests being added under KAFKA-6096 for transaction coordinator
> fail to complete some transactions when multiple transactions are completed
> concurrently.
> The problem is with the following code snippet - there are two very similar
> uses of concurrent map in {{TransactionMarkerChannelManager}} and the test
> fails because some transaction markers are discarded. {{getOrElseUpdate}} in
> scala maps are not atomic. The test passes consistently with one thread.
> {quote}
> val markersQueuePerBroker: concurrent.Map[Int, TxnMarkerQueue] = new
> ConcurrentHashMap[Int, TxnMarkerQueue]().asScala
> val brokerRequestQueue = markersQueuePerBroker.getOrElseUpdate(brokerId, new
> TxnMarkerQueue(broker))
> {quote}
--
This message was sent by Atlassian JIRA
(v6.4.14#64029)
