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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2015/10/30 07:20:27 UTC

[jira] [Assigned] (SPARK-11419) WriteAheadLog recovery improvements for when closeFileAfterWrite is enabled

     [ https://issues.apache.org/jira/browse/SPARK-11419?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-11419:
------------------------------------

    Assignee: Apache Spark

> 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: Apache Spark
>
> 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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