Apache
/
hbase
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

HBASE-24139 : Balancer should avoid leaving idle region servers (#1511) 

Signed-off-by: Viraj Jasani <vjasani@apache.org>
Signed-off-by: Sean Busbey <busbey@apache.org>
Signed-off-by: Anoop Sam John <anoopsamjohn@apache.org>
This commit is contained in:
Beata Sudi 2020-04-22 06:21:53 +02:00 committed by GitHub
parent af17b3ccd6
commit 5f45c8293d
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 28 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
hbase-server/src/main/java/org/apache/hadoop/hbase/master/balancer/BaseLoadBalancer.java
View File

@ -1192,6 +1192,10 @@ public abstract class BaseLoadBalancer implements LoadBalancer {
return false;
}
if(areSomeRegionReplicasColocated(c)) return true;
if(idleRegionServerExist(c)) {
return true;
}
// Check if we even need to do any load balancing
// HBASE-3681 check sloppiness first
float average = cs.getLoadAverage(); // for logging
@ -1223,6 +1227,20 @@ public abstract class BaseLoadBalancer implements LoadBalancer {
return false;
}
protected final boolean idleRegionServerExist(Cluster c){
boolean isServerExistsWithMoreRegions = false;
boolean isServerExistsWithZeroRegions = false;
for (int[] serverList: c.regionsPerServer){
if (serverList.length > 1) {
isServerExistsWithMoreRegions = true;
}
if (serverList.length == 0) {
isServerExistsWithZeroRegions = true;
}
}
return isServerExistsWithMoreRegions && isServerExistsWithZeroRegions;
}
/**
* Generates a bulk assignment plan to be used on cluster startup using a
* simple round-robin assignment.

4
hbase-server/src/main/java/org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.java
View File

@ -324,6 +324,10 @@ public class StochasticLoadBalancer extends BaseLoadBalancer {
return true;
}
if (idleRegionServerExist(cluster)){
return true;
}
double total = 0.0;
float sumMultiplier = 0.0f;
for (CostFunction c : costFunctions) {

7
hbase-server/src/test/java/org/apache/hadoop/hbase/master/balancer/TestStochasticLoadBalancer.java
View File

@ -255,7 +255,8 @@ public class TestStochasticLoadBalancer extends BalancerTestBase {
Map<TableName, Map<ServerName, List<RegionInfo>>> LoadOfAllTable =
(Map) mockClusterServersWithTables(servers);
List<RegionPlan> plans = loadBalancer.balanceCluster(LoadOfAllTable);
assertTrue(plans == null || plans.isEmpty());
boolean emptyPlans = plans == null || plans.isEmpty();
assertTrue(emptyPlans || needsBalanceIdleRegion(mockCluster));
}
}
} finally {
@ -483,6 +484,10 @@ public class TestStochasticLoadBalancer extends BalancerTestBase {
contains(DummyCostFunction.class.getSimpleName()));
}
private boolean needsBalanceIdleRegion(int[] cluster){
return (Arrays.stream(cluster).anyMatch(x -> x>1)) && (Arrays.stream(cluster).anyMatch(x -> x<1));
}
// This mock allows us to test the LocalityCostFunction
private class MockCluster extends BaseLoadBalancer.Cluster {