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