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Posted to issues@hbase.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2026/02/12 18:19:00 UTC
[jira] [Updated] (HBASE-28913) LoadBalancerPerformanceEvaluation fails with NPE
[ https://issues.apache.org/jira/browse/HBASE-28913?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
ASF GitHub Bot updated HBASE-28913:
-----------------------------------
Labels: pull-request-available (was: )
> LoadBalancerPerformanceEvaluation fails with NPE
> ------------------------------------------------
>
> Key: HBASE-28913
> URL: https://issues.apache.org/jira/browse/HBASE-28913
> Project: HBase
> Issue Type: Bug
> Components: tooling
> Reporter: Nihal Jain
> Assignee: Nihal Jain
> Priority: Major
> Labels: pull-request-available
>
> While testing [https://github.com/apache/hbase/pull/6258] found that LoadBalancerPerformanceEvaluation fails with NPE, not related to PR as fails for master as well. This Jira is to track and fix this issue.
> {code:java}
> bin % ./hbase org.apache.hadoop.hbase.master.balancer.LoadBalancerPerformanceEvaluation -regions 30000 -servers 10
> 2024-10-14T01:48:06,772 INFO [main {}] metrics.MetricRegistries: Loaded MetricRegistries class org.apache.hadoop.hbase.metrics.impl.MetricRegistriesImpl
> 2024-10-14T01:48:06,841 INFO [main {}] balancer.LoadBalancerPerformanceEvaluation: Calling roundRobinAssignment
> 2024-10-14T01:48:06,850 INFO [main {}] balancer.BalancerClusterState: server 0 is on rack 0
> 2024-10-14T01:48:06,850 INFO [main {}] balancer.BalancerClusterState: server 1 is on rack 0
> 2024-10-14T01:48:06,850 INFO [main {}] balancer.BalancerClusterState: server 2 is on rack 0
> 2024-10-14T01:48:06,850 INFO [main {}] balancer.BalancerClusterState: server 3 is on rack 0
> 2024-10-14T01:48:06,850 INFO [main {}] balancer.BalancerClusterState: server 4 is on rack 0
> 2024-10-14T01:48:06,850 INFO [main {}] balancer.BalancerClusterState: server 5 is on rack 0
> 2024-10-14T01:48:06,850 INFO [main {}] balancer.BalancerClusterState: server 6 is on rack 0
> 2024-10-14T01:48:06,850 INFO [main {}] balancer.BalancerClusterState: server 7 is on rack 0
> 2024-10-14T01:48:06,850 INFO [main {}] balancer.BalancerClusterState: server 8 is on rack 0
> 2024-10-14T01:48:06,850 INFO [main {}] balancer.BalancerClusterState: server 9 is on rack 0
> Time for roundRobinAssignment : 238ms
> 2024-10-14T01:48:07,079 INFO [main {}] balancer.LoadBalancerPerformanceEvaluation: Calling retainAssignment
> 2024-10-14T01:48:07,091 INFO [main {}] balancer.BalancerClusterState: server 0 is on rack 0
> 2024-10-14T01:48:07,091 INFO [main {}] balancer.BalancerClusterState: server 1 is on rack 0
> 2024-10-14T01:48:07,091 INFO [main {}] balancer.BalancerClusterState: server 2 is on rack 0
> 2024-10-14T01:48:07,091 INFO [main {}] balancer.BalancerClusterState: server 3 is on rack 0
> 2024-10-14T01:48:07,091 INFO [main {}] balancer.BalancerClusterState: server 4 is on rack 0
> 2024-10-14T01:48:07,091 INFO [main {}] balancer.BalancerClusterState: server 5 is on rack 0
> 2024-10-14T01:48:07,092 INFO [main {}] balancer.BalancerClusterState: server 6 is on rack 0
> 2024-10-14T01:48:07,092 INFO [main {}] balancer.BalancerClusterState: server 7 is on rack 0
> 2024-10-14T01:48:07,092 INFO [main {}] balancer.BalancerClusterState: server 8 is on rack 0
> 2024-10-14T01:48:07,092 INFO [main {}] balancer.BalancerClusterState: server 9 is on rack 0
> 2024-10-14T01:48:07,284 INFO [main {}] balancer.BaseLoadBalancer: Reassigned 30000 regions. 0 retained the pre-restart assignment. 30000 regions were assigned to random hosts, since the old hosts for these regions are no longer present in the cluster. These hosts were:
>
> Time for retainAssignment : 204ms
> 2024-10-14T01:48:07,284 INFO [main {}] balancer.LoadBalancerPerformanceEvaluation: Calling balanceCluster
> 2024-10-14T01:48:07,315 INFO [main {}] balancer.BalancerClusterState: server 0 is on rack 0
> 2024-10-14T01:48:07,315 INFO [main {}] balancer.BalancerClusterState: server 1 is on rack 0
> 2024-10-14T01:48:07,315 INFO [main {}] balancer.BalancerClusterState: server 2 is on rack 0
> 2024-10-14T01:48:07,323 INFO [main {}] balancer.BalancerClusterState: server 3 is on rack 0
> 2024-10-14T01:48:07,323 INFO [main {}] balancer.BalancerClusterState: server 4 is on rack 0
> 2024-10-14T01:48:07,323 INFO [main {}] balancer.BalancerClusterState: server 5 is on rack 0
> 2024-10-14T01:48:07,323 INFO [main {}] balancer.BalancerClusterState: server 6 is on rack 0
> 2024-10-14T01:48:07,323 INFO [main {}] balancer.BalancerClusterState: server 7 is on rack 0
> 2024-10-14T01:48:07,323 INFO [main {}] balancer.BalancerClusterState: server 8 is on rack 0
> 2024-10-14T01:48:07,323 INFO [main {}] balancer.BalancerClusterState: server 9 is on rack 0
> 2024-10-14T01:48:07,325 ERROR [main {}] util.AbstractHBaseTool: Error running command-line tool
> java.lang.NullPointerException: Cannot invoke "java.util.List.size()" because "this.candidateGenerators" is null
> at org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer.initCosts(StochasticLoadBalancer.java:750) ~[hbase-balancer-4.0.0-alpha-1-SNAPSHOT.jar:4.0.0-alpha-1-SNAPSHOT]
> at org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer.balanceTable(StochasticLoadBalancer.java:475) ~[hbase-balancer-4.0.0-alpha-1-SNAPSHOT.jar:4.0.0-alpha-1-SNAPSHOT]
> at org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer.balanceCluster(BaseLoadBalancer.java:620) ~[hbase-balancer-4.0.0-alpha-1-SNAPSHOT.jar:4.0.0-alpha-1-SNAPSHOT]
> at org.apache.hadoop.hbase.master.balancer.LoadBalancerPerformanceEvaluation.doWork(LoadBalancerPerformanceEvaluation.java:172) ~[hbase-balancer-4.0.0-alpha-1-SNAPSHOT-tests.jar:4.0.0-alpha-1-SNAPSHOT]
> at org.apache.hadoop.hbase.util.AbstractHBaseTool.run(AbstractHBaseTool.java:150) ~[hbase-common-4.0.0-alpha-1-SNAPSHOT.jar:4.0.0-alpha-1-SNAPSHOT]
> at org.apache.hadoop.hbase.master.balancer.LoadBalancerPerformanceEvaluation.main(LoadBalancerPerformanceEvaluation.java:181) ~[hbase-balancer-4.0.0-alpha-1-SNAPSHOT-tests.jar:4.0.0-alpha-1-SNAPSHOT]{code}
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