[jira] [Resolved] (KYLIN-4005) Saving Cube of a aggregation Groups(40 Dimensions, Max Dimension Combination:5) may cause kylin server OOM

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

     [ https://issues.apache.org/jira/browse/KYLIN-4005?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

nichunen resolved KYLIN-4005.
-----------------------------
       Resolution: Fixed
    Fix Version/s:     (was: Future)
                   v3.0.0-alpha2

> Saving Cube of a aggregation Groups(40 Dimensions, Max Dimension Combination:5) may cause kylin server OOM
> ----------------------------------------------------------------------------------------------------------
>
>                 Key: KYLIN-4005
>                 URL: https://issues.apache.org/jira/browse/KYLIN-4005
>             Project: Kylin
>          Issue Type: Bug
>          Components: REST Service
>    Affects Versions: v2.5.2
>            Reporter: Liu Shaohui
>            Assignee: Liu Shaohui
>            Priority: Critical
>             Fix For: v3.0.0-alpha2
>
>
> A user try to save a cube with a aggregation Groups(40 Dimensions, Max Dimension Combination:5) caused the kylin server OOM. The reason is that the DefaultCuboidScheduler will cost a lot memory when calculating all cube ids. The stack is following
> {code}
> http-bio-7070-exec-35
>   at java.lang.OutOfMemoryError.<init>()V (OutOfMemoryError.java:48)
>   at java.util.HashMap.resize()[Ljava/util/HashMap$Node; (HashMap.java:704)
>   at java.util.HashMap.putVal(ILjava/lang/Object;Ljava/lang/Object;ZZ)Ljava/lang/Object; (HashMap.java:663)
>   at java.util.HashMap.put(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object; (HashMap.java:612)
>   at java.util.HashSet.add(Ljava/lang/Object;)Z (HashSet.java:220)
>   at java.util.AbstractCollection.addAll(Ljava/util/Collection;)Z (AbstractCollection.java:344)
>   at org.apache.kylin.cube.cuboid.DefaultCuboidScheduler.getOnTreeParentsByLayer(Ljava/util/Collection;)Ljava/util/Set; (DefaultCuboidScheduler.java:240)
>   at org.apache.kylin.cube.cuboid.DefaultCuboidScheduler.buildTreeBottomUp()Lorg/apache/kylin/common/util/Pair; (DefaultCuboidScheduler.java:183)
>   at org.apache.kylin.cube.cuboid.DefaultCuboidScheduler.<init>(Lorg/apache/kylin/cube/model/CubeDesc;)V (DefaultCuboidScheduler.java:58)
>   at sun.reflect.GeneratedConstructorAccessor140.newInstance([Ljava/lang/Object;)Ljava/lang/Object; (Unknown Source)
>   at sun.reflect.DelegatingConstructorAccessorImpl.newInstance([Ljava/lang/Object;)Ljava/lang/Object; (DelegatingConstructorAccessorImpl.java:45)
>   at java.lang.reflect.Constructor.newInstance([Ljava/lang/Object;)Ljava/lang/Object; (Constructor.java:423)
>   at org.apache.kylin.cube.cuboid.CuboidScheduler.getInstance(Lorg/apache/kylin/cube/model/CubeDesc;)Lorg/apache/kylin/cube/cuboid/CuboidScheduler; (CuboidScheduler.java:41)
>   at org.apache.kylin.cube.model.CubeDesc.getInitialCuboidScheduler()Lorg/apache/kylin/cube/cuboid/CuboidScheduler; (CubeDesc.java:750)
>   at org.apache.kylin.cube.cuboid.CuboidCLI.simulateCuboidGeneration(Lorg/apache/kylin/cube/model/CubeDesc;Z)I (CuboidCLI.java:47)
>   at org.apache.kylin.rest.service.CubeService.updateCubeAndDesc(Lorg/apache/kylin/cube/CubeInstance;Lorg/apache/kylin/cube/model/CubeDesc;Ljava/lang/String;Z)Lorg/apache/kylin/cube/model/CubeDesc; (CubeService.java:287)
>   at org.apache.kylin.rest.service.CubeService$$FastClassBySpringCGLIB$$17a07c0e.invoke(ILjava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object; (Unknown Source)
>   at org.springframework.cglib.proxy.MethodProxy.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object; (MethodProxy.java:204)
>   at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(Ljava/lang/Object;Ljava/lang/reflect/Method;[Ljava/lang/Object;Lorg/springframework/cglib/proxy/MethodProxy;)Ljava/lang/Object; (CglibAopProxy.java:669)
>   at org.apache.kylin.rest.service.CubeService$$EnhancerBySpringCGLIB$$34de75c4.updateCubeAndDesc(Lorg/apache/kylin/cube/CubeInstance;Lorg/apache/kylin/cube/model/CubeDesc;Ljava/lang/String;Z)Lorg/apache/kylin/cube/model/CubeDesc; (Unknown Source)
>   at org.apache.kylin.rest.controller.CubeController.updateCubeDesc(Lorg/apache/kylin/rest/request/CubeRequest;)Lorg/apache/kylin/rest/request/CubeReq
> {code}



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