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https://issues.apache.org/jira/browse/HDFS-14313?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lisheng Sun updated HDFS-14313:
-------------------------------
Description:
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.
was:
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 is very small and
accurate.
> Get hdfs used space from FsDatasetImpl#volumeMap#ReplicaInfo 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: 2.8.0, 3.0.0-alpha1
> Reporter: Lisheng Sun
> Priority: Major
>
> 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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