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From "Dmitriy Lyubimov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAHOUT-814) QRFirstStep should use their own tmp space to avoid collisions
Date Sun, 18 Sep 2011 20:45:08 GMT

    [ https://issues.apache.org/jira/browse/MAHOUT-814?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13107529#comment-13107529
] 

Dmitriy Lyubimov commented on MAHOUT-814:
-----------------------------------------

they used to use their own space. But I think Sebastian did a fix to use some methods from
abstract mahout test class an
d now they land somewhere else. I can take a look, provided I know what the best practice
really is for using temp directories for tests using local Mr jobs.

> QRFirstStep should use their own tmp space to avoid collisions
> --------------------------------------------------------------
>
>                 Key: MAHOUT-814
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-814
>             Project: Mahout
>          Issue Type: Bug
>            Reporter: Grant Ingersoll
>            Priority: Minor
>
> Running Mahout in an environment with Jenkins also running and am getting:
> {quote}
> java.io.FileNotFoundException: /tmp/q-temp.seq (Permission denied)
>         at java.io.FileOutputStream.open(Native Method)
>         at java.io.FileOutputStream.<init>(FileOutputStream.java:209)
>         at org.apache.hadoop.fs.RawLocalFileSystem$LocalFSFileOutputStream.<init>(RawLocalFileSystem.java:187)
>         at org.apache.hadoop.fs.RawLocalFileSystem$LocalFSFileOutputStream.<init>(RawLocalFileSystem.java:183)
>         at org.apache.hadoop.fs.RawLocalFileSystem.create(RawLocalFileSystem.java:241)
>         at org.apache.hadoop.fs.ChecksumFileSystem$ChecksumFSOutputSummer.<init>(ChecksumFileSystem.java:335)
>         at org.apache.hadoop.fs.ChecksumFileSystem.create(ChecksumFileSystem.java:368)
>         at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:528)
>         at org.apache.hadoop.io.SequenceFile$BlockCompressWriter.<init>(SequenceFile.java:1198)
>         at org.apache.hadoop.io.SequenceFile.createWriter(SequenceFile.java:401)
>         at org.apache.hadoop.io.SequenceFile.createWriter(SequenceFile.java:284)
>         at org.apache.mahout.math.hadoop.stochasticsvd.qr.QRFirstStep.getTempQw(QRFirstStep.java:263)
>         at org.apache.mahout.math.hadoop.stochasticsvd.qr.QRFirstStep.flushSolver(QRFirstStep.java:104)
>         at org.apache.mahout.math.hadoop.stochasticsvd.qr.QRFirstStep.map(QRFirstStep.java:175)
>         at org.apache.mahout.math.hadoop.stochasticsvd.qr.QRFirstStep.collect(QRFirstStep.java:279)
>         at org.apache.mahout.math.hadoop.stochasticsvd.QJob$QMapper.map(QJob.java:142)
>         at org.apache.mahout.math.hadoop.stochasticsvd.QJob$QMapper.map(QJob.java:71)
>         at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:144)
>         at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:764)
>         at org.apache.hadoop.mapred.MapTask.run(MapTask.java:370)
>         at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:212)
> {quote}
> Also seeing the following tests fail:
> {quote}
> Tests in error: 
>   testSSVDSolverSparse(org.apache.mahout.math.hadoop.stochasticsvd.LocalSSVDSolverSparseSequentialTest):
Q job unsuccessful.
>   testSSVDSolverPowerIterations1(org.apache.mahout.math.hadoop.stochasticsvd.LocalSSVDSolverSparseSequentialTest):
Q job unsuccessful.
>   testSSVDSolverPowerIterations1(org.apache.mahout.math.hadoop.stochasticsvd.LocalSSVDSolverDenseTest):
Q job unsuccessful.
>   testSSVDSolverDense(org.apache.mahout.math.hadoop.stochasticsvd.LocalSSVDSolverDenseTest):
Q job unsuccessful.
> {quote}
> I haven't checked all of them, but I suspect they are all due to the same reason.  We
should dynamically create a temp area for each test using temporary directories under the
main temp dir.

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