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From "Xiaoyu Yao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6930) Improve replica eviction from RAM disk
Date Tue, 02 Sep 2014 23:14:51 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14118932#comment-14118932
] 

Xiaoyu Yao commented on HDFS-6930:
----------------------------------

+1

Can you check if capacity > 0? It can be 0 when the RAM_DISK volume is allowed to add/remove
dynamically, 

{code}
 int percentFree = (int) (free * 100 / capacity);
{code}

> 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
>
>
> 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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