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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8157) Writes to RAM DISK reserve locked memory for block files
Date Thu, 14 May 2015 19:49:01 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8157?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14544253#comment-14544253

Arpit Agarwal commented on HDFS-8157:

I think the part you might be missing is we are not calculating how much to reserve but how
much to release. We reserved the full block length and now we are giving back the excess since
the block is finalized short of its full length.

> Writes to RAM DISK reserve locked memory for block files
> --------------------------------------------------------
>                 Key: HDFS-8157
>                 URL: https://issues.apache.org/jira/browse/HDFS-8157
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode
>            Reporter: Arpit Agarwal
>            Assignee: Arpit Agarwal
>         Attachments: HDFS-8157.01.patch, HDFS-8157.02.patch, HDFS-8157.03.patch
> Per discussion on HDFS-6919, the first step is that writes to RAM disk will reserve locked
memory via the FsDatasetCache.

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