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From Li Zhao <ilo...@gmail.com>
Subject Re: question: jvm heap size per task?
Date Wed, 25 Dec 2019 09:16:07 GMT
Understood, thank you for the quick response!

Thanks,
Li

Xintong Song <tonysong820@gmail.com> 于2019年12月25日周三 下午5:05写道:

> Hi Li,
>
> It is true that currently all the task managers have the same heap size,
> and it's fixed ever since started. Unfortunately, your needs cannot be
> satisfied at the moment.
>
> Heap size of task managers cannot be changed once started, because flink
> task managers run in JVMs and JVM does not support resizing after started.
>
> However, there is an ongoing approach towards your needs. The community is
> working on fine-grained resource management, which in general allows
> specify per task/operator resource requirements and allocate task manager
> resources accordingly. You can refers to FLIP-53 [1] and FLIP-56 [2] for
> more details. Another related effort is pluggable slot manager [3], which
> allows having pluggable resource scheduling strategies such as launch task
> managers with customized resources according to the tasks' requirements.
>
> Thank you~
>
> Xintong Song
>
>
> [1]
> https://cwiki.apache.org/confluence/display/FLINK/FLIP-53%3A+Fine+Grained+Operator+Resource+Management
> [2]
> https://cwiki.apache.org/confluence/display/FLINK/FLIP-56%3A+Dynamic+Slot+Allocation
> [3] https://issues.apache.org/jira/browse/FLINK-14106
>
> On Wed, Dec 25, 2019 at 4:18 PM Li Zhao <iloahz@gmail.com> wrote:
>
>> Hi,
>>
>> Greetings, hope this is the proper place to ask questions, apologize if
>> not.
>>
>> We have a shared flink cluster running with docker, want to set different
>> heap size per task(some tasks require larger heap size, while most tasks
>> only need a little), is it feasible?
>>
>> I've gone through [1], [2] and [3], my current understanding is all task
>> managers have the same heap size which is set by `taskmanager.heap.size`
>> and is fixed ever since the task manager is started, and all tasks running
>> in that task manager will share that heap size.
>>
>> Am I understanding it correctly? And any approaches to our needs?
>>
>> Thanks in advance!
>>
>> [1]:
>> https://ci.apache.org/projects/flink/flink-docs-release-1.9/ops/cli.html
>> [2]:
>> https://ci.apache.org/projects/flink/flink-docs-release-1.9/concepts/runtime.html
>> [3]:
>> https://cwiki.apache.org/confluence/display/FLINK/FLIP-49%3A+Unified+Memory+Configuration+for+TaskExecutors
>>
>> Thanks,
>> Li
>>
>

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