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https://issues.apache.org/jira/browse/FLINK-34538?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Maximilian Michels updated FLINK-34538:
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Description:
The current autoscaling algorithm adjusts the parallelism of the job task
vertices according to the processing needs. By adjusting the parallelism, we
systematically scale the amount of CPU for a task. At the same time, we also
indirectly change the amount of memory tasks have at their dispense. However,
there are some problems with this.
# Memory is overprovisioned: On scale up we may add more memory than we
actually need. Even on scale down, the memory / cpu ratio can still be off and
too much memory is used.
# Memory is underprovisioned: For stateful jobs, we risk running into
OutOfMemoryErrors on scale down. Even before running out of memory, too little
memory can have a negative impact on the effectiveness of the scaling.
We lack the capability to tune memory proportionally to the processing needs.
In the same way that we measure CPU usage and size the tasks accordingly, we
need to evaluate memory usage and adjust the heap memory size.
[https://docs.google.com/document/d/19GXHGL_FvN6WBgFvLeXpDABog2H_qqkw1_wrpamkFSc/edit]
> Tune memory of autoscaled jobs
> ------------------------------
>
> Key: FLINK-34538
> URL: https://issues.apache.org/jira/browse/FLINK-34538
> Project: Flink
> Issue Type: New Feature
> Components: Autoscaler, Kubernetes Operator
> Reporter: Maximilian Michels
> Assignee: Maximilian Michels
> Priority: Major
> Labels: pull-request-available
> Fix For: kubernetes-operator-1.8.0
>
>
> The current autoscaling algorithm adjusts the parallelism of the job task
> vertices according to the processing needs. By adjusting the parallelism, we
> systematically scale the amount of CPU for a task. At the same time, we also
> indirectly change the amount of memory tasks have at their dispense. However,
> there are some problems with this.
> # Memory is overprovisioned: On scale up we may add more memory than we
> actually need. Even on scale down, the memory / cpu ratio can still be off
> and too much memory is used.
> # Memory is underprovisioned: For stateful jobs, we risk running into
> OutOfMemoryErrors on scale down. Even before running out of memory, too
> little memory can have a negative impact on the effectiveness of the scaling.
> We lack the capability to tune memory proportionally to the processing needs.
> In the same way that we measure CPU usage and size the tasks accordingly, we
> need to evaluate memory usage and adjust the heap memory size.
> [https://docs.google.com/document/d/19GXHGL_FvN6WBgFvLeXpDABog2H_qqkw1_wrpamkFSc/edit]
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