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

[Xiaoyu Yao (JIRA)]

    [ 
https://issues.apache.org/jira/browse/HDFS-8157?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14543200#comment-14543200
 ] 

Xiaoyu Yao commented on HDFS-8157:
----------------------------------

Thanks [~arpitagarwal] for pointing that. +1 if you could update the patch that 
fixes the issue below in FsDatasetImpl.java and the Jenkins issues.

{code}
-      if (v.isTransientStorage()) 
{cacheManager.releaseRoundDown(replicaInfo.getOriginalBytesReserved() - 
replicaInfo.getNumBytes());
+     if (v.isTransientStorage())  {
+     releaseLockedMemory(replicaInfo.getOriginalBytesReserved() - 
replicaInfo.getNumBytes(), false);
        ramDiskReplicaTracker.addReplica(bpid, replicaInfo.getBlockId(), v, 
replicaInfo.getNumBytes());
        datanode.getMetrics().addRamDiskBytesWrite(replicaInfo.getNumBytes());
      } 
{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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