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Posted to issues@spark.apache.org by "Xiangrui Meng (JIRA)" <ji...@apache.org> on 2015/04/28 03:08:06 UTC
[jira] [Updated] (SPARK-5490) KMeans costs can be incorrect if
tasks need to be rerun
[ https://issues.apache.org/jira/browse/SPARK-5490?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Xiangrui Meng updated SPARK-5490:
---------------------------------
Target Version/s: (was: 1.4.0)
> KMeans costs can be incorrect if tasks need to be rerun
> -------------------------------------------------------
>
> Key: SPARK-5490
> URL: https://issues.apache.org/jira/browse/SPARK-5490
> Project: Spark
> Issue Type: Bug
> Components: MLlib
> Affects Versions: 1.3.0
> Reporter: Sandy Ryza
> Assignee: Sandy Ryza
> Labels: clustering
>
> KMeans uses accumulators to compute the cost of a clustering at each iteration.
> Each time a ShuffleMapTask completes, it increments the accumulators at the driver. If a task runs twice because of failures, the accumulators get incremented twice.
> KMeans uses accumulators in ShuffleMapTasks. This means that a task's cost can end up being double-counted.
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