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https://issues.apache.org/jira/browse/MAHOUT-814?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13108328#comment-13108328
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Dmitriy Lyubimov edited comment on MAHOUT-814 at 9/20/11 2:37 AM:
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another workaround, per tutorial, seems to be to construct this task per the
rule below but does it have to be that complicated just to access task
scratchpad path? besides, i looked at the history of this and it really subject
to change. So using java.io.tmpdir really seems like the safest bet.
{quote}
$${mapred.local.dir}/taskTracker/jobcache/$jobid/$taskid/work/tmp : The
temporary directory for the task. (User can specify the property
mapred.child.tmp to set the value of temporary directory for map and reduce
tasks. This defaults to ./tmp. If the value is not an absolute path, it is
prepended with task's working directory. Otherwise, it is directly assigned.
The directory will be created if it doesn't exist. Then, the child java tasks
are executed with option -Djava.io.tmpdir='the absolute path of the tmp dir'.
Anp pipes and streaming are set with environment variable, TMPDIR='the absolute
path of the tmp dir'). This directory is created, if mapred.child.tmp has the
value ./tmp
{quote}
was (Author: dlyubimov):
There's also some info floating around that job.local.dir property may be a
better candidate for task's scratch space than java.io.tmp.
> SSVD local tests 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
> Affects Versions: 0.5
> Reporter: Grant Ingersoll
> Assignee: Dmitriy Lyubimov
> Priority: Minor
> Fix For: 0.6
>
> Attachments: MAHOUT-814.patch
>
>
> 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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