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From "ASF GitHub Bot (JIRA)" <>
Subject [jira] [Commented] (KYLIN-3963) Provide a custom serializer for PercentileCounter
Date Tue, 23 Apr 2019 12:46:00 GMT


ASF GitHub Bot commented on KYLIN-3963:

nichunen commented on pull request #613: KYLIN-3963 Provide a custom serializer for PercentileCounter
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> Provide a custom serializer for PercentileCounter
> -------------------------------------------------
>                 Key: KYLIN-3963
>                 URL:
>             Project: Kylin
>          Issue Type: Sub-task
>          Components: Flink Engine
>            Reporter: vinoyang
>            Assignee: vinoyang
>            Priority: Major
> {{PercentileCounter}} contains an instance field of Type {{TDigest}} which is not serializable,
so it is marked as {{transient}}. By default, it triggers a NPE when use Flink cube engine:
> {code:java}
> Caused by: org.apache.flink.client.program.ProgramInvocationException: Job failed. (JobID:
8077ff0e0ff01a26f62b1babe90a34b7) at
at at
at org.apache.flink.client.program.ContextEnvironment.execute(
at org.apache.kylin.engine.flink.FlinkCubingByLayer.execute( at
org.apache.kylin.common.util.AbstractApplication.execute( ...
18 more Caused by: org.apache.flink.runtime.client.JobExecutionException: Job execution failed.
at org.apache.flink.runtime.jobmaster.JobResult.toJobExecutionResult( at
... 23 more 
> Caused by: java.lang.NullPointerException at org.apache.kylin.measure.percentile.PercentileCounter.writeRegisters(
at org.apache.kylin.measure.percentile.PercentileSerializer.serialize(
at org.apache.kylin.measure.percentile.PercentileSerializer.serialize(
at org.apache.kylin.measure.MeasureCodec.encode( at org.apache.kylin.measure.BufferedMeasureCodec.encode(
at org.apache.kylin.engine.flink.FlinkCubingByLayer$ at
org.apache.kylin.engine.flink.FlinkCubingByLayer$ at
at at org.apache.flink.runtime.operators.BatchTask.invoke(
at at
> {code}
> So we should provide a customized serializer for {{PercentileCounter}}.

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