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Posted to dev@kylin.apache.org by "RenZhiMin (JIRA)" <ji...@apache.org> on 2018/04/17 07:34:00 UTC

[jira] [Created] (KYLIN-3341) SQL queries take up too much memory

RenZhiMin created KYLIN-3341:
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             Summary: SQL queries take up too much memory
                 Key: KYLIN-3341
                 URL: https://issues.apache.org/jira/browse/KYLIN-3341
             Project: Kylin
          Issue Type: Improvement
          Components: Storage - HBase
    Affects Versions: v2.0.0
            Reporter: RenZhiMin


Some SQL will take up too much memory in the application, the service is not stable, after analysis because the SQL query need to scan the relevant segemnt corresponding hbase table, is through the thread asynchronous request related to SQL cuboid corresponding region. After each segment makes a request, wait for the data to process the hbase callbacks.
But sometimes SQL involves more segments, and before all the segments make requests, there is a large amount of data returned, leading to memory alarm and service instability.



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