[jira] [Created] (HDDS-5757) balancer can not stop at the right time

["Jackson Yao (Jira)" <ji...@apache.org>]

Jackson Yao created HDDS-5757:
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             Summary: balancer can not stop at the right time
                 Key: HDDS-5757
                 URL: https://issues.apache.org/jira/browse/HDDS-5757
             Project: Apache Ozone
          Issue Type: Sub-task
            Reporter: Jackson Yao


when i test container balancer in k8s cluster,  i use the command line :

./ozone admin containerbalancer start -i -1 -t 0.000001 -d 1 -s 500, and set the contaienr size to 1G.

i found that balancer thread can not stop when the cluster is close to balance.

suppose we have three datanodes d1,d2,d3(disk usage are 67G, 67G, 68G), and the fourth d4 datanode's disk usage is 1G. when i start balancer, it begin to balance and work well, many containers have been moved from d1,d2,d3 to d4. but when the cluster is close to balance(the disk usages of the four datanodes are 50G,51G,50G,51G), the balancer is still running , it will move container among those datanodes again and again.

 

so we should let the balancer thread exit when the cluster can not be more balancer



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