[jira] [Commented] (HDFS-8157) Writes to RAM DISK reserve locked memory for block files

[Arpit Agarwal (JIRA)]

    [ 
https://issues.apache.org/jira/browse/HDFS-8157?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14542816#comment-14542816
 ] 

Arpit Agarwal commented on HDFS-8157:
-------------------------------------

Thanks for the review [~xyao].

Good point, the following check in {{FsDatasetImpl#cacheBlock}} should guard 
against that.

{code}
        if (volume.isTransientStorage()) {
          LOG.warn("Caching not supported on block with id " + blockId +
              " since the volume is backed by RAM.");
          return;
        }
{code}

> 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
>
>
> 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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