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https://issues.apache.org/jira/browse/SPARK-11419?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tathagata Das resolved SPARK-11419.
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Resolution: Fixed
Assignee: Burak Yavuz
Fix Version/s: 1.6.0
> WriteAheadLog recovery improvements for when closeFileAfterWrite is enabled
> ---------------------------------------------------------------------------
>
> Key: SPARK-11419
> URL: https://issues.apache.org/jira/browse/SPARK-11419
> Project: Spark
> Issue Type: Improvement
> Components: Streaming
> Reporter: Burak Yavuz
> Assignee: Burak Yavuz
> Fix For: 1.6.0
>
>
> The support for closing WriteAheadLog files after writes was just merged in.
> Closing every file after a write is a very expensive operation as it creates
> many small files on S3. It's not necessary to enable it on HDFS anyway.
> However, when you have many small files on S3, recovery takes very long. We
> can parallelize the recovery process.
> In addition, files start stacking up pretty quickly, and deletes may not be
> able to keep up, therefore we should add support for that as well.
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