Boris Rybalkin created KAFKA-8521:
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Summary: Client unable to get a complete transaction set of
messages using a single poll call
Key: KAFKA-8521
URL: https://issues.apache.org/jira/browse/KAFKA-8521
Project: Kafka
Issue Type: Bug
Components: clients
Reporter: Boris Rybalkin
I am unable to reliably get a complete list of messages from a successful
transaction on a client side.
What I get instead sometimes is a subset of a complete transaction in one poll
and a second half of a transaction in a second poll.
Am I right that poll should always give me a full transaction message set if a
transaction was committed and client uses read_committed isolation level or not?
Pseudo code:
Server:
begin transaction
send (1, "test1")
send (2, "test2")
commit transaction
Client:
isolation level: read_committed
poll -> [ 1 ]
poll -> [ 2 ]
What I want is:
poll -> [1, 2]
Also what I observed, when keys are the same for the messages in the
transaction I always get a complete message set in one poll, but when keys are
very different in inside transaction I usually get transaction spread across
multiple polls.
I can provide a working example if you think that this is a bug and not a
misunderstanding of how poll works.
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