Ordering of published messages is not preserved when doing asynchronous
publication
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Key: BOOKKEEPER-37
URL: https://issues.apache.org/jira/browse/BOOKKEEPER-37
Project: Bookkeeper
Issue Type: Bug
Components: hedwig-client
Reporter: Matthieu Morel
Symptoms:
- if a publisher sends messages asynchronously through the asyncPublish method,
the ordering is not preserved in Hedwig
Example:
- a publisher sends M1, M2, M3 by invoking the asyncPublish method
The Hedwig broker may see these messages in the following order: M2, M1, M3
A subscriber will also see messages as M2, M1, M3
How to reproduce:
- see attached test case: synchronous publishing preserves ordering, but
asynchronous publishing does not.
The cause of the problem:
- my understanding is that this is due to asynchronous creation of multiple
netty channels on the publisher side. There is no ordering since messages are
not sent through the same channel.
Suggested solution:
Some buffering on the publisher side would allow to reuse the same channel and
maintain ordering.
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