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https://issues.apache.org/jira/browse/MAHOUT-1615?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14149854#comment-14149854
]
ASF GitHub Bot commented on MAHOUT-1615:
----------------------------------------
Github user dlyubimov commented on a diff in the pull request:
https://github.com/apache/mahout/pull/52#discussion_r18109074
--- Diff:
spark/src/main/scala/org/apache/mahout/sparkbindings/SparkEngine.scala ---
@@ -127,45 +133,64 @@ object SparkEngine extends DistributedEngine {
*/
def drmFromHDFS (path: String, parMin:Int = 0)(implicit sc:
DistributedContext): CheckpointedDrm[_] = {
- val rdd = sc.sequenceFile(path, classOf[Writable],
classOf[VectorWritable], minPartitions = parMin)
- // Get rid of VectorWritable
- .map(t => (t._1, t._2.get()))
+ // HDFS Paramaters
+ val hConf= new Configuration()
+ val hPath= new Path(path)
+ val fs= FileSystem.get(hConf)
- def getKeyClassTag[K: ClassTag, V](rdd: RDD[(K, V)]) =
implicitly[ClassTag[K]]
+ /** Get the Key Class For the Sequence File */
+ def getKeyClassTag[K:ClassTag] = ClassTag(new SequenceFile.Reader(fs,
hPath, hConf).getKeyClass)
--- End diff --
I think we don't need a key tag for writable. We only need key tag for
value type (i.e. ClassTag.Int, etc.). This is not used anywhere. I suspect just
matching on the class should be o.k.
> SparkEngine drmFromHDFS returning the same Key for all Key,Vec Pairs for
> Text-Keyed SequenceFiles
> -------------------------------------------------------------------------------------------------
>
> Key: MAHOUT-1615
> URL: https://issues.apache.org/jira/browse/MAHOUT-1615
> Project: Mahout
> Issue Type: Bug
> Reporter: Andrew Palumbo
> Fix For: 1.0
>
>
> When reading in seq2sparse output from HDFS in the spark-shell of form
> <Text,VectorWriteable> SparkEngine's drmFromHDFS method is creating rdds
> with the same Key for all Pairs:
> {code}
> mahout> val drmTFIDF= drmFromHDFS( path =
> "/tmp/mahout-work-andy/20news-test-vectors/part-r-00000")
> {code}
> Has keys:
> {...}
> key: /talk.religion.misc/84570
> key: /talk.religion.misc/84570
> key: /talk.religion.misc/84570
> {...}
> for the entire set. This is the last Key in the set.
> The problem can be traced to the first line of drmFromHDFS(...) in
> SparkEngine.scala:
> {code}
> val rdd = sc.sequenceFile(path, classOf[Writable], classOf[VectorWritable],
> minPartitions = parMin)
> // Get rid of VectorWritable
> .map(t => (t._1, t._2.get()))
> {code}
> which gives the same key for all t._1.
>
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