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HBASE-30303: Fix balancing for regions assigned through RSGroup fallback #8519

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HBASE-30303: Fix balancing for regions assigned through RSGroup fallback #8519

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12 changes: 9 additions & 3 deletions hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.java
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Original file line number Diff line number Diff line change
Expand Up @@ -322,12 +322,18 @@ private List<ServerName> filterServers(Set<Address> servers, List<ServerName> on
} catch (IOException exp) {
LOG.debug("RSGroup information null for region of table " + tableName, exp);
}
List<ServerName> candidateServers = Collections.emptyList();
if (targetRSGInfo != null) {
List<ServerName> onlineServers = Lists.newArrayList(clusterLoad.keySet());
candidateServers = filterOfflineServers(targetRSGInfo, onlineServers);
if (isFallbackEnabled() && candidateServers.isEmpty()) {
candidateServers = getFallBackCandidates(onlineServers);
}
}
for (Map.Entry<ServerName, List<RegionInfo>> serverRegionMap : clusterLoad.entrySet()) {
ServerName currentHostServer = serverRegionMap.getKey();
List<RegionInfo> regionInfoList = serverRegionMap.getValue();
if (
targetRSGInfo == null || !targetRSGInfo.containsServer(currentHostServer.getAddress())
) {
if (!candidateServers.contains(currentHostServer)) {
regionInfoList.forEach(regionInfo -> {
regionPlansForMisplacedRegions.add(new RegionPlan(regionInfo, currentHostServer, null));
});
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3 changes: 3 additions & 0 deletions hbase-server/src/test/java/org/apache/hadoop/hbase/rsgroup/TestRSGroupsFallback.java
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Expand Up @@ -17,6 +17,7 @@
*/
package org.apache.hadoop.hbase.rsgroup;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertTrue;

import java.io.IOException;
Expand Down Expand Up @@ -93,10 +94,12 @@ public void testFallback() throws Exception {
// server of test group crash, regions move to default group
crashRsInGroup(groupName);
assertRegionsInGroup(tableName, RSGroupInfo.DEFAULT_GROUP);
assertEquals(0, MASTER.balance().getMovesCalculated());

// server of default group crash, regions move to any other group
crashRsInGroup(RSGroupInfo.DEFAULT_GROUP);
assertRegionsInGroup(tableName, FALLBACK_GROUP);
assertEquals(0, MASTER.balance().getMovesCalculated());

@chaijunjie0101 chaijunjie0101 Aug 3, 2026 •
edited
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maybe we need trigger balancer once before we check the balance plan，and make sure balancer is doing to generate plan, because the default balance is scheduled


// add a new server to default group, regions move to default group
TEST_UTIL.getMiniHBaseCluster().startRegionServerAndWait(60000);
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