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https://issues.apache.org/jira/browse/KYLIN-5454?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ruixuan Zhang updated KYLIN-5454:
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Attachment: (was: 异步查询OOM.pdf)
> Downloading the async query result may cause OOM error
> ------------------------------------------------------
>
> Key: KYLIN-5454
> URL: https://issues.apache.org/jira/browse/KYLIN-5454
> Project: Kylin
> Issue Type: Bug
> Affects Versions: 5.0-alpha
> Reporter: Ruixuan Zhang
> Assignee: Ruixuan Zhang
> Priority: Major
> Fix For: 5.0-alpha
>
>
> When using
> {{http://host:port/kylin/api/async_query/\{query_id}/result_download?}} to
> get asynchronous query result, out-of-memory error might occur. The reason is
> the formatting process while downloading the result needs read & write, and
> there is batch processing rather than streaming processing. Therefore, a
> refactor is needed for async query. The main idea of revision is to move the
> formatting from downloading result from HDFS to processing & saving query
> result on HDFS, and use streaming read & write instead.
> The details of design are in the attached file.
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