virajjasani commented on pull request #3438:
URL: https://github.com/apache/hbase/pull/3438#issuecomment-871500621
> Also, the "localhost" part is suspicious, why does AM look for a localhost
address?
It is `BOGUS_SERVER_NAME`. AM tries to put it in `FAILED_OPEN` state after
getting one:
```
private void processBogusAssignments(Map<ServerName, List<HRegionInfo>>
bulkPlan) {
if (bulkPlan.containsKey(LoadBalancer.BOGUS_SERVER_NAME)) {
// Found no plan for some regions, put those regions in RIT
for (HRegionInfo hri : bulkPlan.get(LoadBalancer.BOGUS_SERVER_NAME)) {
regionStates.updateRegionState(hri, State.FAILED_OPEN);
}
bulkPlan.remove(LoadBalancer.BOGUS_SERVER_NAME);
}
}
```
And it is `RSGroupBasedLoadBalancer` that tries to add it:
```
//if not server is available assign to bogus so it ends up in RIT
if(!assignments.containsKey(LoadBalancer.BOGUS_SERVER_NAME)) {
assignments.put(LoadBalancer.BOGUS_SERVER_NAME, new
ArrayList<HRegionInfo>());
}
assignments.get(LoadBalancer.BOGUS_SERVER_NAME).add(region);
```
and similar logic is available few other places in
`RSGroupBasedLoadBalancer`.
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