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https://issues.apache.org/jira/browse/HBASE-29453?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Duo Zhang resolved HBASE-29453.
-------------------------------
Fix Version/s: 2.7.0
2.6.4
Hadoop Flags: Reviewed
Resolution: Fixed
Pushed to branch-2.6+.
Thanks [~dev8103] for contributing and others for reviewing!
> NPE on CacheAwareLoadBalancer.balanceTable
> ------------------------------------------
>
> Key: HBASE-29453
> URL: https://issues.apache.org/jira/browse/HBASE-29453
> Project: HBase
> Issue Type: Bug
> Components: Balancer
> Affects Versions: 3.0.0-beta-1, 2.7.0, 2.6.3
> Reporter: Wellington Chevreuil
> Assignee: Dev Hingu
> Priority: Trivial
> Labels: pull-request-available
> Fix For: 2.7.0, 3.0.0-beta-2, 2.6.4
>
>
> Found the errors below on master logs when CacheAwareLoadBalancer is enabled:
> {noformat}
> 2025-07-16 12:53:34,360 ERROR org.apache.hadoop.hbase.ScheduledChore: Caught
> error
> java.lang.NullPointerException: Cannot invoke
> "java.util.List.sort(java.util.Comparator)" because "plans" is null
> at
> org.apache.hadoop.hbase.master.balancer.CacheAwareLoadBalancer.balanceTable(CacheAwareLoadBalancer.java:216)
> at
> org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer.balanceCluster(BaseLoadBalancer.java:1871)
> at org.apache.hadoop.hbase.master.HMaster.balance(HMaster.java:1839)
> at org.apache.hadoop.hbase.master.HMaster.balance(HMaster.java:1756)
> at
> org.apache.hadoop.hbase.master.balancer.BalancerChore.chore(BalancerChore.java:47)
> at org.apache.hadoop.hbase.ScheduledChore.run(ScheduledChore.java:158)
> at
> java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539)
> at
> java.base/java.util.concurrent.FutureTask.runAndReset(FutureTask.java:305)
> at
> java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:305)
> at
> org.apache.hadoop.hbase.JitterScheduledThreadPoolExecutorImpl$JitteredRunnableScheduledFuture.run(JitterScheduledThreadPoolExecutorImpl.java:107)
> at
> java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
> at
> java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
> at java.base/java.lang.Thread.run(Thread.java:840)
> {noformat}
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