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https://issues.apache.org/jira/browse/HDFS-14313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16900549#comment-16900549
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Wei-Chiu Chuang commented on HDFS-14313:
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Hi [~leosun08] thanks a lot for continued work here, and [~linyiqun] for
continued review while I dropped out.
I think v11 patch is good. [~linyiqun] if you are ok feel free to commit.
One thing that's missing out in the v11 is the update to hdfs-default.xml which
was missing since v8.
Additionally there should be an additional config key
"fs.getspaceused.classname" in core-default.xml, and state that possible
options are
# org.apache.hadoop.fs.DU (default)
# org.apache.hadoop.fs.WindowsGetSpaceUsed
# org.apache.hadoop.fs.DFCachingGetSpaceUsed
#
org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.ReplicaCachingGetSpaceUsed
> 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
>
>
> 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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