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https://issues.apache.org/jira/browse/HDFS-14313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16869237#comment-16869237
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Wei-Chiu Chuang commented on HDFS-14313:
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Thanks.
I really like the benchmark. Do you happen to have the benchmark for 10 million
block replicas? I guess for HBase clusters, DataNodes are not dense. But these
days it is not uncommon to find DataNodes with 7 or even 10 million blocks.
It's fine if you don't have that, and I just wanted to make sure.
Additionally, what's the memory consumption look like? I assume it doubles
DataNode memory usage.
synchronization: I find it hard to believe that FsDatasetImpl#deepCopyReplica()
is not synchronized to avoid data race.
> 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
>
>
> 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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