Apache9 commented on a change in pull request #2450:
URL: https://github.com/apache/hbase/pull/2450#discussion_r494004814
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File path:
hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.java
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@@ -203,8 +203,11 @@ public void setMasterServices(MasterServices
masterServices) {
regionList.forEach(r -> currentAssignmentMap.put(r, regions.get(r)));
Map<ServerName, List<RegionInfo>> pairResult =
this.internalBalancer.retainAssignment(currentAssignmentMap,
pair.getSecond());
- pairResult.forEach((server, rs) ->
- assignments.computeIfAbsent(server, s ->
Lists.newArrayList()).addAll(rs));
+ if (pairResult == null || pairResult.isEmpty()) {
Review comment:
When will retainAssignment return null? If there is no difference
between a null and an empty Map, let's just return an empty Map to avoid the
null check here?
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