[jira] [Created] (KYLIN-4433) When uhc step is turned on, Build Dimension Dictionary job cannot get correct configuration

["ChangjiGuo (Jira)" <ji...@apache.org>]

ChangjiGuo created KYLIN-4433:
---------------------------------

             Summary: When uhc step is turned on, Build Dimension Dictionary job cannot get correct configuration
                 Key: KYLIN-4433
                 URL: https://issues.apache.org/jira/browse/KYLIN-4433
             Project: Kylin
          Issue Type: Bug
          Components: Job Engine
    Affects Versions: v2.6.4
            Reporter: ChangjiGuo


Hi guys :

    In the _Configuration overrides_ step of _Cube Designer_, I added the following configuration:
{code:java}
kylin.engine.mr.build-uhc-dict-in-additional-step = true
{code}
    When building the cube, it will take an extra step to handle the UHC dimensions, but I found that in the step of 'Build Dimension Dictionary', it still builds the dictionary that has been built in the previous step which takes double the time to build the dictionary.

    When I traced the source code, I found that our expected code was not executed due to _config.isBuildUHCDictWithMREnabled() == false_ :
{code:java}
if (config.isBuildUHCDictWithMREnabled() && uhcColumns.contains(col)) {
    colDir = new Path(dictPath, col.getIdentity());
} else {
    colDir = new Path(factColumnsInputPath, col.getIdentity());
}
{code}
    The root cause is that the configuration used in this step is the environment configuration, but our parameters are set in the cube:
{code:java}
final KylinConfig config = KylinConfig.getInstanceFromEnv();{code}



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