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Posted to issues@spark.apache.org by "Sean Owen (JIRA)" <ji...@apache.org> on 2015/04/13 13:07:12 UTC
[jira] [Resolved] (SPARK-6738) EstimateSize is difference with
spill file size
[ https://issues.apache.org/jira/browse/SPARK-6738?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Sean Owen resolved SPARK-6738.
------------------------------
Resolution: Not A Problem
We can reopen if there is more detail, but the problem report is focusing on the size of one spill file when there are lots of them. The in-memory size is also not necessarily the on-disk size. I haven't seen a report of a problem here either, like something that then fails.
> EstimateSize is difference with spill file size
> ------------------------------------------------
>
> Key: SPARK-6738
> URL: https://issues.apache.org/jira/browse/SPARK-6738
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 1.2.0
> Reporter: Hong Shen
>
> ExternalAppendOnlyMap spill 2.2 GB data to disk:
> {code}
> 15/04/07 20:27:37 INFO collection.ExternalAppendOnlyMap: Thread 54 spilling in-memory map of 2.2 GB to disk (61 times so far)
> 15/04/07 20:27:37 INFO collection.ExternalAppendOnlyMap: /data11/yarnenv/local/usercache/spark/appcache/application_1423737010718_40455651/spark-local-20150407202613-4e80/11/temp_local_fdb4a583-5d13-4394-bccb-e1217d5db812
> {code}
> But the file size is only 2.2M.
> {code}
> ll -h /data11/yarnenv/local/usercache/spark/appcache/application_1423737010718_40455651/spark-local-20150407202613-4e80/11/
> total 2.2M
> -rw-r----- 1 spark users 2.2M Apr 7 20:27 temp_local_fdb4a583-5d13-4394-bccb-e1217d5db812
> {code}
> The GC log show that the jvm memory is less than 1GB.
> {code}
> 2015-04-07T20:27:08.023+0800: [GC 981981K->55363K(3961344K), 0.0341720 secs]
> 2015-04-07T20:27:14.483+0800: [GC 987523K->53737K(3961344K), 0.0252660 secs]
> 2015-04-07T20:27:20.793+0800: [GC 985897K->56370K(3961344K), 0.0606460 secs]
> 2015-04-07T20:27:27.553+0800: [GC 988530K->59089K(3961344K), 0.0651840 secs]
> 2015-04-07T20:27:34.067+0800: [GC 991249K->62153K(3961344K), 0.0288460 secs]
> 2015-04-07T20:27:40.180+0800: [GC 994313K->61344K(3961344K), 0.0388970 secs]
> 2015-04-07T20:27:46.490+0800: [GC 993504K->59915K(3961344K), 0.0235150 secs]
> {code}
> The estimateSize is hugh difference with spill file size
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