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This section describes new configurations introduced by Cluster Mirroring.

Mirror

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Set via CreateMirror or IncrementalAlterConfigs. Stored in cluster metadata records.

Key	Description	Default
bootstrap.servers	A list of host/port pairs to use for establishing the initial connection to the source cluster.
mirror.topic.properties.exclude	A comma-separated list of topic config property names to exclude from synchronization. Properties in this list will not be replicated from the source cluster. The mirror.name property is always excluded regardless of this setting.	follower.replication.throttled.replicas, leader.replication.throttled.replicas, message.timestamp.difference.max.ms, log.message.timestamp.before.max.ms, log.message.timestamp.after.max.ms, message.timestamp.type, unclean.leader.election.enable, min.insync.replicas, mirror.name
mirror.topics.include	A comma-separated list of regex patterns for topic names to include in mirroring. Topics on the source cluster whose names match at least one of the patterns will be automatically discovered and mirrored.
mirror.topics.exclude	A comma-separated list of regex patterns for topic names to exclude from mirroring.  Topics matching the exclude pattern are not mirrored even if they match mirror.topics.include. Internal topics are always excluded. Exclude always wins over include. By default internal topics (starting with __ ) are excluded.
mirror.groups.include	A comma-separated list of regex patterns for group IDs to include in offset synchronization. Only groups whose IDs match at least one of the patterns will have their offsets replicated from the source cluster.
mirror.groups.exclude	A comma-separated list of regex patterns for group IDs to exclude from offset synchronization. Groups matching the exclude pattern are not replicated even if they match mirror.groups.include.
mirror.acl.include	A comma-separated list of ACL include rules. Each rule uses semicolon-separated fields: resourceType;resourceName;operation;permissionType;principal. Use '*' as wildcard for any field. The resourceName field supports regex patterns. Trailing wildcard fields can be omitted. See AclRule javadoc for examples. Examples: TOPIC;orders.* (all ACLs for topics matching orders.*) *;*;*;*;User:alice (all ACLs for principal User:alice) *;*;*;*;User:app-.* (all ACLs for principals matching User:app-.*) TOPIC;*;READ;ALLOW (all topic READ/ALLOW ACLs) GROUP;consumer-.*;READ;ALLOW;User:bob (READ/ALLOW ACLs on groups matching consumer-.* for User:bob) TOPIC;orders.*,*;*;*;*;User:alice (sync all topic ACLs for orders.* topics and all ACLs for User:alice)	*
security.protocol	Protocol for source cluster communication (PLAINTEXT, SSL, SASL_PLAINTEXT, SASL_SSL).
sasl.*	SASL configuration properties.
ssl.*	SSL configuration properties.

Topic

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Set by topic creation or alter. Stored in topic config.

Key	Description	Default
mirror.name	Identifies the mirror that manages this topic. Topics with this configuration set are read-only and can only be modified through mirror management APIs. This property is filtered out from DescribeConfigs responses to avoid exposing internal state to users.
mirror.replication.throttled.replicas	A list of replicas for which log replication should be throttled on the mirror follower node. The list should describe a set of replicas in the form [PartitionId]:[BrokerId],[PartitionId]:[BrokerId]:... or alternatively the wildcard '*' can be used to throttle all replicas for this topic."
mirror.support.unclean.leader.election	When enabled, LME log truncation waits for all replicas (not just ISR members) to join the ISR and complete the truncation.	false

Broker

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Set via broker config. Stored in server.properties or dynamic broker config.

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