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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6988) Add configurable limit for percentage-based eviction threshold
Date Tue, 23 Sep 2014 18:36:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14145202#comment-14145202
] 

Arpit Agarwal commented on HDFS-6988:
-------------------------------------

Thanks for taking a look at the patch. They are integers as they are replica counts - to be
multiplied by the default block length at runtime.

A single default simply won't work for a range of ram disk sizes. It will force every administrator
to configure one more setting. This way we have reasonable default behavior for most drive
sizes, from a few GB up to 100GB.

> Add configurable limit for percentage-based eviction threshold
> --------------------------------------------------------------
>
>                 Key: HDFS-6988
>                 URL: https://issues.apache.org/jira/browse/HDFS-6988
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode
>    Affects Versions: HDFS-6581
>            Reporter: Arpit Agarwal
>            Assignee: Arpit Agarwal
>             Fix For: HDFS-6581
>
>         Attachments: HDFS-6988.01.patch, HDFS-6988.02.patch
>
>
> Per feedback from [~cmccabe] on HDFS-6930, we can make the eviction thresholds configurable.
The hard-coded thresholds may not be appropriate for very large RAM disks.



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