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Posted to hdfs-issues@hadoop.apache.org by "Lisheng Sun (JIRA)" <ji...@apache.org> on 2019/06/24 03:12:01 UTC
[jira] [Issue Comment Deleted] (HDFS-14313) Get hdfs used space
from FsDatasetImpl#volumeMap#ReplicaInfo in memory instead of df/du
[ https://issues.apache.org/jira/browse/HDFS-14313?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Lisheng Sun updated HDFS-14313:
-------------------------------
Comment: was deleted
(was: [~jojochuang] Thanks for your comments. I add lock in FsDatasetImpl#deepCopyReplica.
{code:java}
@Override
public Set<? extends Replica> deepCopyReplica(String bpid)
throws IOException {
try (AutoCloseableLock lock = datasetLock.acquire()) {
Set<? extends Replica> replicas =
new HashSet<>(volumeMap.replicas(bpid) == null ? Collections.EMPTY_SET
: volumeMap.replicas(bpid));
return replicas;
}
}
{code}
Please continue to help review this issue. Thank you.
)
> 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
>
>
> 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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