[GitHub] [incubator-doris] morningman opened a new pull request #1517: Fix bug that replicas of a tablet may be located on same host

[GitBox <gi...@apache.org>]

morningman opened a new pull request #1517: Fix bug that replicas of a tablet may be located on same host
URL: https://github.com/apache/incubator-doris/pull/1517
 
 
   Doris supports deploying multi BE on one host. So when allocating BE for replicas of
   a tablet, we should select different host. But there is a bug in tablet scheduler
   that same host may be selected for one tablet. This patch will fix this problem.
   
   There are some places related to this problem:
   
   1. Create Table
       There is no bug in Create Table process.
   
   2. Tablet Scheduler
       Fixed when selecting BE for REPLICA_MISSING and REPLICA_RELOCATING.
       Fixed when balance the tablet.
   
   3. Colocate Table Balancer
       Fixed when selecting BE for repairing colocate backend sequence.
       Not fix in colocate group balance. Leave it to colocate repairing.
   
   4. Tablet report
       Tablet report may add replica to catalog. But I did not check the host here,
       Tablet Scheduler will fix it.
   
   ISSUE #1501 

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