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https://issues.apache.org/jira/browse/HADOOP-12759?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15132782#comment-15132782
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Daniel Templeton commented on HADOOP-12759:
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Playing around with the test a bit, I can comfortably get the sleep down to
about half a second. Less than that, and it gets unreliable. Any heartburn
about a half-second sleep?
> RollingFileSystemSink should eagerly rotate directories
> -------------------------------------------------------
>
> Key: HADOOP-12759
> URL: https://issues.apache.org/jira/browse/HADOOP-12759
> Project: Hadoop Common
> Issue Type: Improvement
> Affects Versions: 2.8.0
> Reporter: Daniel Templeton
> Assignee: Daniel Templeton
> Priority: Critical
> Attachments: YARN-4664.001.patch
>
>
> The RollingFileSystemSink only rolls over to a new directory if a new metrics
> record comes in. The issue is that HDFS does not update the file size until
> it's closed (HDFS-5478), and if no new metrics record comes in, then the file
> size will never be updated.
> This JIRA is to add a background thread to the sink that will eagerly close
> the file at the top of the hour.
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