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From "Antony Mayi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-6334) spark-local dir not getting cleared during ALS
Date Sat, 14 Mar 2015 18:19:38 GMT

    [ https://issues.apache.org/jira/browse/SPARK-6334?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14361947#comment-14361947
] 

Antony Mayi commented on SPARK-6334:
------------------------------------

I had to increase the partitioning up to this level due to permanent OOM issues (GC overhead
limit exceeded) - although there was enough RAM globally, the partitions were too big for
individual executors (I have 28GB RAM + 4GB for spark.yarn.executor.memoryOverhead per each
executor). with 728 partitions I got around the OOM problem.

> spark-local dir not getting cleared during ALS
> ----------------------------------------------
>
>                 Key: SPARK-6334
>                 URL: https://issues.apache.org/jira/browse/SPARK-6334
>             Project: Spark
>          Issue Type: Bug
>          Components: MLlib
>    Affects Versions: 1.2.0
>            Reporter: Antony Mayi
>         Attachments: als-diskusage.png
>
>
> when running bigger ALS training spark spills loads of temp data into the local-dir (in
my case yarn/local/usercache/antony.mayi/appcache/... - running on YARN from cdh 5.3.2) eventually
causing all the disks of all nodes running out of space (in my case I have 12TB of available
disk capacity before kicking off the ALS but it all gets used (and yarn kills the containers
when reaching 90%).
> even with all recommended options (configuring checkpointing and forcing GC when possible)
it still doesn't get cleared.
> here is my (pseudo)code (pyspark):
> {code}
> sc.setCheckpointDir('/tmp')
> training = sc.pickleFile('/tmp/dataset').repartition(768).persist(StorageLevel.MEMORY_AND_DISK)
> model = ALS.trainImplicit(training, 50, 15, lambda_=0.1, blocks=-1, alpha=40)
> sc._jvm.System.gc()
> {code}
> the training RDD has about 3.5 billions of items (~60GB on disk). after about 6 hours
the ALS will consume all 12TB of disk space in local-dir data and gets killed. my cluster
has 192 cores, 1.5TB RAM and for this task I am using 37 executors of 4 cores/28+4GB RAM each.
> this is the graph of disk consumption pattern showing the space being all eaten from
7% to 90% during the ALS (90% is when YARN kills the container):
> !als-diskusage.png!



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