sink: set max-message-bytes to initialize producer. (#3080)

[ti-chi-bot]

This is an automated cherry-pick of #3080

What problem does this PR solve?

Close #3081

This is a fix after #3002.

In #3002, we set 512M as the minimum max-message-size to initialize the sarama producer, which would batch small message then larger than broker's message.max.bytes, make the message failed to send.

If the user does not pass max-message-bytes when creating then changefeed, the producer use 512M, it's very likely larger than the broker's value. so we have to set the default value smaller, to 1M.

Also, set encoder's defaultMaxMessageBytes to 1M, to prevent encoded message too large, then reject by the client.

What is changed and how it works?

• use custom max-message-size to initialize the producer.
• set default MaxMessageSize to 1M.

Check List

Tests

• No code

Code changes

Side effects

Related changes

Release note

change Kafka sink default `MaxMessageBytes` to 1MB.

[ti-chi-bot]

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[3AceShowHand]

/run-all-tests

[codecov-commenter]

Codecov Report

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[amyangfei]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: b7fd211

[3AceShowHand]

/run-integration-tests