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Posted to issues@spark.apache.org by "Cory Nguyen (JIRA)" <ji...@apache.org> on 2015/06/02 02:47:17 UTC
[jira] [Commented] (SPARK-5841) Memory leak in DiskBlockManager
[ https://issues.apache.org/jira/browse/SPARK-5841?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14568312#comment-14568312 ]
Cory Nguyen commented on SPARK-5841:
------------------------------------
We are using Luigi with Spark to manage our jobs
However we run into a unique rare case with the following conditions that trigger this resolved Block Manger Bug:
- Dataset is relatively large ~ 1.5TB
- Spark job is ran with Luigi
- save to local HDFS
The spark job would process data and mappings just fine, until the very end when it proceeds to save the files to local hdfs this is when it triggers this bug.
However, the job saves and complete data successfully if it was saved to s3:// location.
wondering what might cause this resolved bug to trigger when ran with luigi saving to local hdfs but not trigger when saved to s3 with luigi or ran without luigi?
> Memory leak in DiskBlockManager
> -------------------------------
>
> Key: SPARK-5841
> URL: https://issues.apache.org/jira/browse/SPARK-5841
> Project: Spark
> Issue Type: Bug
> Components: Block Manager
> Affects Versions: 1.2.1
> Reporter: Matt Whelan
> Assignee: Matt Whelan
> Fix For: 1.3.0
>
>
> DiskBlockManager registers a Runtime shutdown hook, which creates a hard reference to the entire Driver ActorSystem. If a long-running JVM repeatedly creates and destroys SparkContext instances, it leaks memory.
> I suggest we deregister the shutdown hook if DiskBlockManager.stop is called. It's redundant at that point.
> PR coming.
> See also http://mail-archives.apache.org/mod_mbox/spark-user/201501.mbox/%3CCA+kjH+w_DDTEBE9XB6NrPxLTUXD=NC_d-3ogxTUMk_5v-E0bLQ@mail.gmail.com%3E
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