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https://issues.apache.org/jira/browse/SPARK-8997?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-8997:
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Assignee: Feynman Liang (was: Apache Spark)
> Improve LocalPrefixSpan performance
> -----------------------------------
>
> Key: SPARK-8997
> URL: https://issues.apache.org/jira/browse/SPARK-8997
> Project: Spark
> Issue Type: Improvement
> Components: MLlib
> Affects Versions: 1.5.0
> Reporter: Xiangrui Meng
> Assignee: Feynman Liang
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> We can improve the performance by:
> 1. run should output Iterator instead of Array
> 2. Local count shouldn't use groupBy, which creates too many arrays. We can
> use PrimitiveKeyOpenHashMap
> 3. We can use list to avoid materialize frequent sequences
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