morningman opened a new issue #4147:
URL: https://github.com/apache/incubator-doris/issues/4147
**Describe the bug**
When decommission BE, some of tablets may has lots of replicas generated by
clone task.
**Why**
Give examples of why:
1. Tablet X has 3 replicas on A, B, C 3 BEs.
2. C is decommission, so we choose the Backend D to relocating the new
replica,
3. After relocating, Tablet X has 4 replicas: A, B, C(decommision), D(may be
version incomplete)
4. D may be version incomplete because the clone task ran a long time, the
new version has been published.
5. At the next time of tablet checking, Tablet X's status is still
REPLICA_RELOCATING.
If we don't choose D as dest BE to do the new relocating, it will choose
new backend E
to store the new replicas. So back and forth, the number of replicas
will increase forever.
So a better solution is to select C as dest BE again to do the clone task.
This may trigger an increment clone task
that can be done more fast.
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