[
https://issues.apache.org/jira/browse/HDFS-8157?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14544212#comment-14544212
]
Colin Patrick McCabe commented on HDFS-8157:
--------------------------------------------
I still don't understand why we would ever round down. If a block contains 11
kb, 12kb of RAM will be used to cache it. So why would we ever round down?
This is the reason why HDFS read caching (HDFS-4949) always rounds up to the
nearest 4kb (or whatever the OS page size is). Perhaps I am misunderstanding a
detail here.
> 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.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
