[jira] [Created] (HDDS-5526) ContainerBalancer#checkConditionsForBalancing can use container size for checking iteration limits.

["Siddhant Sangwan (Jira)" <ji...@apache.org>]

Siddhant Sangwan created HDDS-5526:
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             Summary: ContainerBalancer#checkConditionsForBalancing can use container size for checking iteration limits.
                 Key: HDDS-5526
                 URL: https://issues.apache.org/jira/browse/HDDS-5526
             Project: Apache Ozone
          Issue Type: Sub-task
          Components: SCM
            Reporter: Siddhant Sangwan


ContainerBalancer#checkConditionsForBalancing is used to check whether the max size to move or max datanodes to involve limits have been reached.

Currently, ContainerBalancer#doIteration uses this method before finding a ContainerMoveSelection for a source datanode. Since the check is performed before selecting the next container to move, the configuration {color:#172b4d}OZONE_SCM_CONTAINER_SIZE {color}(default is 5GB) is used to predetermine if:

(sizeMovedPerIteration + configured container size) >= maxSizeToMovePerIteration.

This check will cause the current iteration to stop in cases like: maxSizeToMovePerIteration = 100GB, sizeMovedPerIteration = 96GB, and {color:#172b4d}OZONE_SCM_CONTAINER_SIZE{color} {color:#172b4d}= 5GB. {color}

{color:#172b4d}On one hand the current implementation can avoid extra work by not letting balancer continue when we are very close to the limit. On the other hand, because of this implementation, we will never reach the limit. This Jira tracks if it's better to check conditions using container size in ContainerBalancer#checkConditionsForBalancing after having found a ContainerMoveSelection in ContainerBalancer#doIteration.{color}

 

 



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