Indexer acknowledgment and multisite clustering failure

[payl_chdhry]

What happens if indexer acknowledgment is enabled and there is multisite clustering or minimum rf is not met due to indexer failure.
If I understand it right, no acknowledgement will be sent till data has been replicated as per rf value and in such scenario UF will hold the data block in its queue. Would ingestion stall when queue is full (it's default size is only few MBs) even though data ingestion is working on another site. And if so, ingestion would completely stop even when ingestion is working fine only replication is impacted.

I am looking for below journeys:
UK --> Intermediate Heavy Forwarder --> Indexer
pcf microservices --> Intermediate Heavy Forwarder --> Indexer

[richgalloway]

The default behavior is for the indexer to create enough copies of the data to meet the RF before sending an ACK.  That can be changed in server.conf, however.  See https://docs.splunk.com/Documentation/Splunk/9.2.1/Indexer/Useforwarders#How_indexer_acknowledgment_...for details.