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https://issues.apache.org/jira/browse/MAHOUT-471?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved MAHOUT-471.
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Resolution: Not A Problem
> RowSimilarityJob-Mapper-EntriesToVectorsReducer failure
> --------------------------------------------------------
>
> Key: MAHOUT-471
> URL: https://issues.apache.org/jira/browse/MAHOUT-471
> Project: Mahout
> Issue Type: Bug
> Components: Collaborative Filtering
> Affects Versions: 0.4
> Reporter: Han Hui Wen
> Priority: Minor
> Fix For: 0.4
>
>
> I used Boolean Data and SIMILARITY_TANIMOTO_COEFFICIENT
> java.io.IOException: Task: attempt_201008101359_0084_r_000000_0 - The reduce
> copier failed
> at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:380)
> at org.apache.hadoop.mapred.Child.main(Child.java:170)
> Caused by: java.io.IOException: Intermediate merge failed
> at
> org.apache.hadoop.mapred.ReduceTask$ReduceCopier$InMemFSMergeThread.doInMemMerge(ReduceTask.java:2576)
> at
> org.apache.hadoop.mapred.ReduceTask$ReduceCopier$InMemFSMergeThread.run(ReduceTask.java:2501)
> Caused by: java.lang.RuntimeException: java.io.EOFException
> at
> org.apache.hadoop.io.WritableComparator.compare(WritableComparator.java:103)
> at org.apache.hadoop.mapred.Merger$MergeQueue.lessThan(Merger.java:373)
> at org.apache.hadoop.util.PriorityQueue.upHeap(PriorityQueue.java:123)
> at org.apache.hadoop.util.PriorityQueue.put(PriorityQueue.java:50)
> at org.apache.hadoop.mapred.Merger$MergeQueue.merge(Merger.java:447)
> at org.apache.hadoop.mapred.Merger$MergeQueue.merge(Merger.java:381)
> at org.apache.hadoop.mapred.Merger.merge(Merger.java:107)
> at org.apache.hadoop.mapred.Merger.merge(Merger.java:93)
> at
> org.apache.hadoop.mapred.ReduceTask$ReduceCopier$InMemFSMergeThread.doInMemMerge(ReduceTask.java:2551)
> ... 1 more
> Caused by: java.io.EOFException
> at java.io.DataInputStream.readByte(DataInputStream.java:250)
> at org.apache.mahout.math.Varint.readUnsignedVarInt(Varint.java:159)
> at org.apache.mahout.math.Varint.readSignedVarInt(Varint.java:140)
> at
> org.apache.mahout.math.hadoop.similarity.SimilarityMatrixEntryKey.readFields(SimilarityMatrixEntryKey.java:65)
> at
> org.apache.hadoop.io.WritableComparator.compare(WritableComparator.java:97)
> ... 9 more
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