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Status
Current state: Under Discussionaccepted
Discussion thread: here [Change the link from the KIP proposal email archive to your own email thread]
Voting thread: here
JIRA:
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3.0 gives us the opportunity to make backwards backward-incompatible changes. With that, now is a good time to change the default serde from `byte array` to `null`. This change will allow users to better catch serialization issues from the beginning, as it's likely that they need to be setting a default serde themselves or passing in a serde rather than relying on the byte array default.
Public Interfaces
Within `StreamsConfig.java`, DEFAULT_KEY_SERDE_CLASS_CONFIG
will default to null
and DEFAULT_VALUE_SERDE_CLASS_CONFIG
will default to null. That means that the following existing methods will return `null` if no default is set, whereas before they returned byte array key/value serde.
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// Will return null if no default is set through configs public Serde defaultKeySerde() { } // Will return null if no default is set through configs public Serde defaultValueSerde() { } |
Proposed Changes
Describe the new thing you want to do in appropriate detail. This may be fairly extensive and have large subsections of its own. Or it may be a few sentences. Use judgement based on the scope of the changeWhere the default key and value serde used to be a byte array, it will now be null. Instead of throwing Null Pointer Exceptions, we'll throw a Config Exception to remind the user that they need to set a serde through the default configs or pass one in.
Compatibility, Deprecation, and Migration Plan
- What impact (if any) will there be on existing users?
- If we are changing behavior how will we phase out the older behavior?
- If we need special migration tools, describe them here.
- When will we remove the existing behavior?
Rejected Alternatives
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- Users who currently rely on the default serdes being a byte array will need to update their applications to manually set the default serdes to byte array before upgrading to 3.0