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                Sparder is the implemenatation of new distributed query engine which backend by a spark application. If Sparder is dead, all your query will failed. So please check its And you can check sparder's liveness after Kylin instance(Query Server) was started in application list of Resource Manager Web UI. (We plan to add canary tools for monitor Sparder in 4.0 SparderCanary tool has been added in 4.0-beta )to monitor the inventory status of sparder. When the sparder dies, SparderCanary will try to pull it up automatically.

• Is Hadoop3 supported ?

                Kylin   Hadoop 3 is supported in kylin 4.0.0-alpha did not support Hadoop3. It is plan to be supported in 4.0.0-beta-beta, and has been verified on CDH 5.7, CDH 6.2, EMR 5.31, EMR 6.0.0, HDP2.4. Hadoop3 and EMR environments require additional configuration, please check the Installation Guide.

• If you faced Exception with message like this : "Cannot find hive-site.xml in kylin_hadoop_conf_dir", please:

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• How to use the new garbage cleaning tool, which garbage will be cleaned up?

                To be updatedPlease refer to How to clean up useless storage.

• Can Cube Planner be used?

                Not currently supported.  It is plan to be Cube Planner Phase1 is supported in 4.0.0-beta. Please refer to How to use Cube Planner in Kylin 4.

• Where is the dimension dictionary stored?

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                It is not supported in Kylin 4.0.0-alpha and Kylin 4.0.0-beta.

• Does query on Spark support Spark Schduler Pool setting(resource isolation)?  

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