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https://issues.apache.org/jira/browse/HDFS-8157?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14531057#comment-14531057
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Arpit Agarwal commented on HDFS-8157:
-------------------------------------
Thanks for the review. This was a very preliminary patch. I'll post an updated
patch when I get some more time to work on this. I might just post a
consolidated patch for this and HDFS-8192.
bq. Maybe I am missing something, but I don't understand the purpose behind
releaseRoundDown. Why would we round down to a page size when allocating or
releasing memory?
For the common case when the finalized length is not a multiple of the page
size. e.g. Initial reservation = 16KB, page size = 4KB. A The block is
finalized at 11KB. We want to release round_down(16 - 11) and not round up.
> 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
> Labels: BB2015-05-TBR
> Attachments: HDFS-8157.01.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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