Metadata parameters (cdap-site.xml and cdap-default.xml)

Parameter Name	Default Value	Version Introduced	Description

Parameter Name	Default Value	Version Introduced	Description
`metadata.max.allowed.chars`	`50`		Maximum number of characters for metadata keys, values, and tags.
`metadata.consumer.extensions.dir`	`/opt/cdap/master/ext/metadataconsumers`	6.8.0	Semicolon-separated list of local directories on the CDAP Master that are scanned for metadata consumer extensions.
`metadata.consumer.extensions.enabled.list`		6.8.0	Comma separated list of metadata consumer extension names that are enabled. Extensions that are not present in this list will be ignored.
`metadata.service.bind.address`	`0.0.0.0`		Metadata HTTP service bind address.
`metadata.service.bind.port`	`0`		Metadata HTTP service bind port; if 0, binds to a random port.
`metadata.service.exec.threads`	`${http.service.exec.threads}`		Number of Netty service executor threads for metadata HTTP service.
`metadata.service.worker.threads`	`${http.service.worker.threads}`		Number of Netty service IO worker threads for metadata HTTP service.
`metadata.messaging.topic`	`metadata`		Topic name used to publish metadata messages in the messaging system.
`metadata.messaging.fetch.size`	`100`		Number of messages to fetch from messaging system for each batch.
`metadata.messaging.poll.delay.millis`	`2000`		The delay in milliseconds that the lineage processor checks again for new events after it detects there was no event.
`metadata.messaging.retries.on.conflict`	`100`		The maximal number of times a metadata message will be processed if it repeatedly causes a conflict exception. After this, the message will be discarded.
`metadata.messaging.publish.size.limit`	`2147483647`	6.6.0	The maximum number of characters for a JSON string representation of a lineage to be published. If the lineage exceeds this size it will not be published.