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https://issues.apache.org/jira/browse/KAFKA-4906?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Grant Henke resolved KAFKA-4906.
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Resolution: Won't Fix
> Support 0.9 brokers with a newer Producer or Consumer version
> -------------------------------------------------------------
>
> Key: KAFKA-4906
> URL: https://issues.apache.org/jira/browse/KAFKA-4906
> Project: Kafka
> Issue Type: Improvement
> Components: clients
> Affects Versions: 0.10.2.0
> Reporter: Grant Henke
> Assignee: Grant Henke
>
> KAFKA-4507 added the ability for newer Kafka clients to talk to older Kafka
> brokers if a new feature supported by a newer wire protocol was not
> used/required.
> We currently support brokers as old as 0.10.0.0 because thats when the
> ApiVersionsRequest/Response was added to the broker (KAFKA-3307).
> However, there are relatively few changes between 0.9.0.0 and 0.10.0.0 on the
> wire, making it possible to support another major broker version set by
> assuming that any disconnect resulting from an ApiVersionsRequest is from a
> 0.9 broker and defaulting to legacy protocol versions.
> Supporting 0.9 with newer clients can drastically simplify upgrades, allow
> for libraries and frameworks to easily support a wider set of environments,
> and let developers take advantage of client side improvements without
> requiring cluster upgrades first.
> Below is a list of the wire protocol versions by release for reference:
> {noformat}
> 0.10.x
> Produce(0): 0 to 2
> Fetch(1): 0 to 2
> Offsets(2): 0
> Metadata(3): 0 to 1
> OffsetCommit(8): 0 to 2
> OffsetFetch(9): 0 to 1
> GroupCoordinator(10): 0
> JoinGroup(11): 0
> Heartbeat(12): 0
> LeaveGroup(13): 0
> SyncGroup(14): 0
> DescribeGroups(15): 0
> ListGroups(16): 0
> SaslHandshake(17): 0
> ApiVersions(18): 0
> 0.9.x:
> Produce(0): 0 to 1 (no response timestamp from v2)
> Fetch(1): 0 to 1 (no response timestamp from v2)
> Offsets(2): 0
> Metadata(3): 0 (no cluster id or rack info from v1)
> OffsetCommit(8): 0 to 2
> OffsetFetch(9): 0 to 1
> GroupCoordinator(10): 0
> JoinGroup(11): 0
> Heartbeat(12): 0
> LeaveGroup(13): 0
> SyncGroup(14): 0
> DescribeGroups(15): 0
> ListGroups(16): 0
> SaslHandshake(17): UNSUPPORTED
> ApiVersions(18): UNSUPPORTED
> 0.8.2.x:
> Produce(0): 0 (no quotas from v1)
> Fetch(1): 0 (no quotas from v1)
> Offsets(2): 0
> Metadata(3): 0
> OffsetCommit(8): 0 to 1 (no global retention time from v2)
> OffsetFetch(9): 0 to 1
> GroupCoordinator(10): 0
> JoinGroup(11): UNSUPPORTED
> Heartbeat(12): UNSUPPORTED
> LeaveGroup(13): UNSUPPORTED
> SyncGroup(14): UNSUPPORTED
> DescribeGroups(15): UNSUPPORTED
> ListGroups(16): UNSUPPORTED
> SaslHandshake(17): UNSUPPORTED
> ApiVersions(18): UNSUPPORTED
> {noformat}
> Note: Due to KAFKA-3088 it may take up to request.timeout.time to fail an
> ApiVersionsRequest and failover to legacy protocol versions unless we handle
> that scenario specifically in this patch. The workaround would be to reduce
> request.timeout.time if needed.
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