[jira] [Updated] (KYLIN-2135) Enlarge FactDistinctColumns reducer number

["kangkaisen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KYLIN-2135?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

kangkaisen updated KYLIN-2135:
------------------------------
    Attachment: KYLIN-2135.patch

Update the patch. This patch is based on master branch. 
1 Enlarge the reducer number for the UHC.(ShardByColumns and GlobalDictionaryColumns)

2 update the close() method and next() method in {{DFSFileTableReader}}.

3 move the max reducer count verdict to {{FactDistinctColumnsJob}}

Shaofeng, please you review the patch again. Thanks you.

> Enlarge FactDistinctColumns reducer number
> ------------------------------------------
>
>                 Key: KYLIN-2135
>                 URL: https://issues.apache.org/jira/browse/KYLIN-2135
>             Project: Kylin
>          Issue Type: Improvement
>          Components: Job Engine
>    Affects Versions: v1.5.4.1
>            Reporter: kangkaisen
>            Assignee: kangkaisen
>         Attachments: KYLIN-2135.patch, KYLIN-2135.patch, new.png, old.png
>
>
> When the hive table has billions of rows and use global dictionary for precise count distinct measures, the  {{Extract Fact Table Distinct Columns}} job will run o long time.
> So we could use more reducer to deal with the one column.



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