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From "Apache Spark (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-11419) WriteAheadLog recovery improvements for when closeFileAfterWrite is enabled
Date Fri, 30 Oct 2015 06:20:27 GMT

    [ https://issues.apache.org/jira/browse/SPARK-11419?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14981975#comment-14981975
] 

Apache Spark commented on SPARK-11419:
--------------------------------------

User 'brkyvz' has created a pull request for this issue:
https://github.com/apache/spark/pull/9373

> 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
>
> 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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