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https://issues.apache.org/jira/browse/KYLIN-4015?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shaofeng SHI resolved KYLIN-4015.
---------------------------------
Resolution: Fixed
> Kylin build cube error at the "Build UHC Dictionary" step
> ---------------------------------------------------------
>
> Key: KYLIN-4015
> URL: https://issues.apache.org/jira/browse/KYLIN-4015
> Project: Kylin
> Issue Type: Bug
> Components: Job Engine
> Affects Versions: v2.5.2
> Environment: Fusion Insight
> Reporter: zhao jintao
> Assignee: zhao jintao
> Priority: Major
> Labels: easyfix
> Fix For: v2.6.3
>
> Original Estimate: 168h
> Remaining Estimate: 168h
>
> Hi All:
> We know, kylin builds dimension dictionary in kylin job client. But if a cube
> has uhc dimensions, it will cost much more CPU and memory resources. Kylin
> provides the ability to build uhc dictionary using the MR engine to reduce
> the resource consumption of the build engine.
> But I find that the "Build UHC Dictionary" step build error. This step run
> using MR engine. This is the error info from yarn:
> org.apache.hadoop.mapred.YarnChild: Exception running child :
> java.io.IOException:
> hdfs://hacluster/xxx.../xxx/fact_distinct_columns/xxx/FIELD_NAME.dic-r-00001
> not a SequenceFile.
> at org.apache.hadoop.io.SequenceFile$Reader.init(SequenceFile.java:)
> at org.apache.hadoop.io.SequenceFile$Reader.initialize(SequenceFile.java:)
> at org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:)
> The reason of this problem is that the "Extract Fact Table Distinct " step
> output two type of files:".dci" and ".rldict"; but the ".dci" file is not a
> sequence file, so the "Build UHC Dictionary" step should filter ".dci" file
> when run with MR engine.
> I resolve this problem and will summit my code.
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