Denis Chudov created IGNITE-24067:
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Summary: Adjust placement driver for the usage of learners
Key: IGNITE-24067
URL: https://issues.apache.org/jira/browse/IGNITE-24067
Project: Ignite
Issue Type: Improvement
Reporter: Denis Chudov
Assignments placement driver provides the assignments that it gets from the
meta storage. So, since the learners will be included into the assignments that
are written to the meta storage, no additional changes of assignment placement
driver are required.
Lease placement driver, however, {*}should be adjusted{*}: primary replica
should be colocated with consensus group, so the lease placement driver should
filter the assignments to get only peers before choosing the lease candidate.
Also, if it's impossible to choose a primary replica from stable assignments,
it should be chosen from the first element of the pending assignment queue.
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