vagetablechicken opened a new issue #4763:
URL: https://github.com/apache/incubator-doris/issues/4763
**Is your feature request related to a problem? Please describe.**
We want to add more strategies for load balance, actually for rebalance. And
the new strategies may want to execute a concrete move of a replica from one
server to another, a move can be described as {tablet, from_be, dest_be}. Thus,
the rebalance class should support to delete the specified replica(in from_be).
So we need to define a new base class for rebalance, the origin rebalance
strategy could work on it as well.
**Describe the solution you'd like**
The new base class, named `Rebalancer`.
class methods:
- selectAlternativeTablets: use a strategy to determine which tablet to
rebalance.
- createBalanceTask: try to create a clone task for rebalance.
- getCachedSrcBackendId: needed by the new priority "replica is src replica
of rebalance" in handleRedundantReplica.The origin rebalance doesn't need to
override getCachedSrcBackendId. The move-based strategies should override it.
- updateLoadStatistic: the rebalancer may have cache, so it should be
stateful. Add a method to update the load statistic.
The origin `LoadBalancer`, which will named as `BeLoadRebalancer`, just
need to extend from `Rebalancer` without any logic change.
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