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Posted to issues@kylin.apache.org by "kangkaisen (JIRA)" <ji...@apache.org> on 2016/12/12 05:56:58 UTC

[jira] [Updated] (KYLIN-2269) Reduce MR memory usage for global dict

     [ https://issues.apache.org/jira/browse/KYLIN-2269?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

kangkaisen updated KYLIN-2269:
------------------------------
    Attachment: KYLIN-2269.patch

This is the patch.
This patch has run a  some time in our production env. which could reduce the MR memory usage and mapper running time of Base Cuboid for global dict significantly.

> Reduce MR memory usage for global dict
> --------------------------------------
>
>                 Key: KYLIN-2269
>                 URL: https://issues.apache.org/jira/browse/KYLIN-2269
>             Project: Kylin
>          Issue Type: Improvement
>    Affects Versions: v1.6.0
>            Reporter: kangkaisen
>            Assignee: kangkaisen
>         Attachments: KYLIN-2269.patch
>
>
> currently, in {{Build Base Cuboid Data}}, if user use the global dict and the global dict size significantly larger the mapper memory size, the {{CachedTreeMap}} will load all values as much as possible and the soft references object will stick around for a while when GC, So which will make the {{Build Base Cuboid Data}}  mapper pause for a long time even could not  finish.



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