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https://issues.apache.org/jira/browse/MAHOUT-99?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Grant Ingersoll reopened MAHOUT-99:
-----------------------------------
Hi Pallavi,
I'm getting:
09/03/18 11:13:56 WARN mapred.LocalJobRunner: job_local_0001
java.lang.StringIndexOutOfBoundsException: String index out of range: -1
at java.lang.String.substring(String.java:1938)
at
org.apache.mahout.clustering.kmeans.Cluster.decodeCluster(Cluster.java:81)
at
org.apache.mahout.clustering.kmeans.KMeansUtil.configureWithClusterInfo(KMeansUtil.java:80)
at
org.apache.mahout.clustering.kmeans.KMeansMapper.configure(KMeansMapper.java:66)
at
org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:58)
at
org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:83)
at org.apache.hadoop.mapred.MapRunner.configure(MapRunner.java:34)
at
org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:58)
at
org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:83)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:338)
at
org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:138)
when running http://cwiki.apache.org/MAHOUT/syntheticcontroldata.html
> Improving speed of KMeans
> -------------------------
>
> Key: MAHOUT-99
> URL: https://issues.apache.org/jira/browse/MAHOUT-99
> Project: Mahout
> Issue Type: Improvement
> Components: Clustering
> Reporter: Pallavi Palleti
> Assignee: Grant Ingersoll
> Fix For: 0.1
>
> Attachments: MAHOUT-99-1.patch, Mahout-99.patch, MAHOUT-99.patch
>
>
> Improved the speed of KMeans by passing only cluster ID from mapper to
> reducer. Previously, whole Cluster Info as formatted s`tring was being sent.
> Also removed the implicit assumption of Combiner runs only once approach and
> the code is modified accordingly so that it won't create a bug when combiner
> runs zero or more than once.
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