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https://issues.apache.org/jira/browse/KAFKA-5147?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16022338#comment-16022338
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ASF GitHub Bot commented on KAFKA-5147:
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GitHub user apurvam opened a pull request:
https://github.com/apache/kafka/pull/3132
KAFKA-5147: Add missing synchronization to TransactionManager
The basic idea is that exactly three collections, ie. `pendingRequests`,
`newPartitionsToBeAddedToTransaction`, and `partitionsInTransaction` are
accessed from the context of application threads. The first two are modified
from the application threads, and the last is read from those threads.
So to make the `TransactionManager` truly thread safe, we have to ensure
that all accesses to these three members are done in a synchronized block. I
inspected the code, and I believe this patch puts the synchronization in all
the correct places.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/apurvam/kafka
KAFKA-5147-transaction-manager-synchronization-fixes
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/kafka/pull/3132.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #3132
----
commit 9c869396d09712ebc76ef03c55507cd099b47914
Author: Apurva Mehta <apu...@confluent.io>
Date: 2017-05-24T05:28:15Z
Add missing synchronization to TransactionManager
----
> KafkaProducer's TransactionManager needs a review on synchronization
> --------------------------------------------------------------------
>
> Key: KAFKA-5147
> URL: https://issues.apache.org/jira/browse/KAFKA-5147
> Project: Kafka
> Issue Type: Sub-task
> Reporter: Apurva Mehta
> Assignee: Apurva Mehta
> Priority: Blocker
> Labels: exactly-once
> Fix For: 0.11.0.0
>
>
> Currently, the completion handlers are not synchronized, though they access
> shared state like `partitionsInTransaction`, and `lastError`,
> `pendingPartitionsToBeaddedToTransaction`, etc.
> We should either make the collections concurrent or synchronize the handlers.
> In general, we need to review this code to ensure that the synchronization is
> correct.
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