[jira] Updated: (MAHOUT-471) RowSimilarityJob-Mapper-EntriesToVectorsReducer failure

["Sean Owen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAHOUT-471?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sean Owen updated MAHOUT-471:
-----------------------------

        Fix Version/s: 0.4
    Affects Version/s: 0.4
             Priority: Minor  (was: Major)
          Component/s: Collaborative Filtering

Sebastian would you mind taking a look since you created this bit? Can you reproduce it?
It might be that something is reading varints but the input is actually another format.


> 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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