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https://issues.apache.org/jira/browse/SPARK-9326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14641045#comment-14641045
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Apache Spark commented on SPARK-9326:
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User 'kayousterhout' has created a pull request for this issue:
https://github.com/apache/spark/pull/7650
> Spark never closes the lock file used to prevent concurrent downloads
> ---------------------------------------------------------------------
>
> Key: SPARK-9326
> URL: https://issues.apache.org/jira/browse/SPARK-9326
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 1.4.0
> Reporter: Kay Ousterhout
> Assignee: Kay Ousterhout
> Priority: Minor
>
> A lock file is used to ensure multiple executors running on the same machine
> don't download the same file concurrently. Spark never closes these lock
> files (we release the lock, but releasing the lock does not close the
> underlying file). In theory, if an executor fetched a large number of files,
> this could eventually lead to an issue with too many open files.
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