Status

Current state: Adopted

Under Discussion thread: here

Discussion Voting thread: pending here

JIRA:

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Currently there are two mirror-maker implementations, the original MirrorMaker and MirrorMaker 2 (MM2), the latter being a complete rewrite leveraging the Connect framework. We believe MirrorMaker 2 is an improvement over the original MirrorMaker when it comes to reliability and functionality for the majority of use cases. We intend to focus on MirrorMaker 2 for future development and hence we propose deprecating MirrorMaker 2 for future removalthe original first version of MirrorMaker with the intention to remove it completely in the future.

Public Interfaces

No API changes are proposed.

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No functional changes at this point. In the subsequent major release (4.0), we can remove the legacy mirror-maker.sh command-line tool and related code entirely.

N.B. prior to removing MM1 (in v4.0) we will need to land IdentityReplicationPolicy (aka LegacyReplicationPolicy), as described in KIP-382, which provides for use-cases that MM2 cannot otherwise handle out-of-the-box. Various IdentityReplicationPolicy implementations can be found floating around in the meantime.

Rejected Alternatives

• We could provide a shim between the legacy command-line tool and the new connect-based implementation, as originally proposed in KIP-382. However, given the length of time between major releases, it doesn't seem necessary to make the transition between MM1 and MM2 quite so frictionless. Instead, users will have a long time and ample warning to transition away from MM1 at their own pace. If, for some reason, a new major release lands sooner than expected, we can revisit this decision.