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mirrormaker: restrict the number of checkpoint connector tasks #17911

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The MirrorCheckpointConnector uses the global tasks max for setting the number of maximum tasks. This can cause extreme burden on single Kafka broker when hundreds of checkpoint tasks are consuming from from the single partition topic. The default is set to 1 and configurable.

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The MirrorCheckpointConnector uses the global tasks max for setting
the number of maximum tasks. This can cause extreme burden on single
Kafka broker when hundreds of checkpoint tasks are consuming from
from the single partition topic. The default is set to 1 and configurable.
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