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Posted to hdfs-issues@hadoop.apache.org by "Arpit Agarwal (JIRA)" <ji...@apache.org> on 2014/09/03 05:41:52 UTC

[jira] [Updated] (HDFS-6930) Improve replica eviction from RAM disk

     [ https://issues.apache.org/jira/browse/HDFS-6930?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Arpit Agarwal updated HDFS-6930:
--------------------------------
    Attachment: HDFS-6930.02.patch

Thanks for the reviews.

Colin, I filed HDFS-6988 to make the thresholds configurable.

Xiaoyu, updated patch attached to check capacity before division.

> Improve replica eviction from RAM disk
> --------------------------------------
>
>                 Key: HDFS-6930
>                 URL: https://issues.apache.org/jira/browse/HDFS-6930
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode
>    Affects Versions: HDFS-6581
>            Reporter: Arpit Agarwal
>            Assignee: Arpit Agarwal
>         Attachments: HDFS-6930.01.patch, HDFS-6930.02.patch
>
>
> The current replica eviction scheme is inefficient since it performs multiple file operations in the context of block allocation.
> A better implementation would be asynchronous eviction when free space on RAM disk falls below a low watermark to make block allocation faster.



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