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From "Yiqun Lin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-14313) Get hdfs used space from FsDatasetImpl#volumeMap#ReplicaInfo in memory instead of df/du
Date Tue, 06 Aug 2019 10:10:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-14313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16900849#comment-16900849
] 

Yiqun Lin commented on HDFS-14313:
----------------------------------

[~leosun08], can you rebase the code? I applied the v012 patch in my local, it showed that
the core-default.xml cannot be applied. You may git pull the latest code and then generate
the new patch file.
{noformat}
error: patch failed: hadoop-common-project/hadoop-common/src/main/resources/core-default.xml:3494
error: hadoop-common-project/hadoop-common/src/main/resources/core-default.xml: patch does
not apply
{noformat}
 Also can you update the description to following? From the original design, GetSpaceUsed
is not only used for telling HDFS space used.
{noformat}
   <description>
      The class that can tell estimate much space is used in a directory.
      There are four impl classes that being supported: 
      org.apache.hadoop.fs.DU(default), org.apache.hadoop.fs.WindowsGetSpaceUsed
      org.apache.hadoop.fs.DFCachingGetSpaceUsed and
      org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.ReplicaCachingGetSpaceUsed.
      And the ReplicaCachingGetSpaceUsed impl class only used in HDFS module.
    </description>
{noformat}

> Get hdfs used space from FsDatasetImpl#volumeMap#ReplicaInfo in memory  instead of df/du
> ----------------------------------------------------------------------------------------
>
>                 Key: HDFS-14313
>                 URL: https://issues.apache.org/jira/browse/HDFS-14313
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode, performance
>    Affects Versions: 2.6.0, 2.7.0, 2.8.0, 2.9.0, 3.0.0, 3.1.0
>            Reporter: Lisheng Sun
>            Assignee: Lisheng Sun
>            Priority: Major
>         Attachments: HDFS-14313.000.patch, HDFS-14313.001.patch, HDFS-14313.002.patch,
HDFS-14313.003.patch, HDFS-14313.004.patch, HDFS-14313.005.patch, HDFS-14313.006.patch, HDFS-14313.007.patch,
HDFS-14313.008.patch, HDFS-14313.009.patch, HDFS-14313.010.patch, HDFS-14313.011.patch, HDFS-14313.012.patch
>
>
> There are two ways of DU/DF getting used space that are insufficient.
>  #  Running DU across lots of disks is very expensive and running all of the processes
at the same time creates a noticeable IO spike.
>  #  Running DF is inaccurate when the disk sharing by multiple datanode or other servers.
>  Getting hdfs used space from  FsDatasetImpl#volumeMap#ReplicaInfos in memory is very
small and accurate. 



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