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https://issues.apache.org/jira/browse/FLINK-12342?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zhenqiu Huang updated FLINK-12342:
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Attachment: flink-1.6.png
flink-1.4.png
> Yarn Resource Manager Acquires Too Many Containers
> --------------------------------------------------
>
> Key: FLINK-12342
> URL: https://issues.apache.org/jira/browse/FLINK-12342
> Project: Flink
> Issue Type: Improvement
> Components: Deployment / YARN
> Affects Versions: 1.6.4, 1.7.2, 1.8.0
> Environment: We runs job in Flink release 1.6.3.
> Reporter: Zhenqiu Huang
> Assignee: Zhenqiu Huang
> Priority: Major
> Labels: pull-request-available
> Attachments: Screen Shot 2019-04-29 at 12.06.23 AM.png,
> container.log, flink-1.4.png, flink-1.6.png
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> In currently implementation of YarnFlinkResourceManager, it starts to acquire
> new container one by one when get request from SlotManager. The mechanism
> works when job is still, say less than 32 containers. If the job has 256
> container, containers can't be immediately allocated and appending requests
> in AMRMClient will be not removed accordingly. We observe the situation that
> AMRMClient ask for current pending request + 1 (the new request from slot
> manager) containers. In this way, during the start time of such job, it asked
> for 4000+ containers. If there is an external dependency issue happens, for
> example hdfs access is slow. Then, the whole job will be blocked without
> getting enough resource and finally killed with SlotManager request timeout.
> Thus, we should use the total number of container asked rather than pending
> request in AMRMClient as threshold to make decision whether we need to add
> one more resource request.
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