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https://issues.apache.org/jira/browse/HDFS-11968?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16187767#comment-16187767
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Mukul Kumar Singh commented on HDFS-11968:
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The support for StoragePolicy was added to ViewFileSystem with HADOOP-13272.
The current patch makes use of this api to find out the underlying storage
policies. Here is the output for 2 namenode setup
{code}
[hdfs@y126 ~]$ /opt/hadoop/hadoop-3.1.0-SNAPSHOT/bin/hdfs storagepolicies
-listPolicies
17/10/02 08:39:43 WARN util.NativeCodeLoader: Unable to load native-hadoop
library for your platform... using builtin-java classes where applicable
Block Storage Policies:
BlockStoragePolicy{COLD:2, storageTypes=[ARCHIVE],
creationFallbacks=[], replicationFallbacks=[]}
BlockStoragePolicy{WARM:5, storageTypes=[DISK, ARCHIVE],
creationFallbacks=[DISK, ARCHIVE], replicationFallbacks=[DISK, ARCHIVE]}
BlockStoragePolicy{HOT:7, storageTypes=[DISK], creationFallbacks=[],
replicationFallbacks=[ARCHIVE]}
BlockStoragePolicy{ONE_SSD:10, storageTypes=[SSD, DISK],
creationFallbacks=[SSD, DISK], replicationFallbacks=[SSD, DISK]}
BlockStoragePolicy{ALL_SSD:12, storageTypes=[SSD],
creationFallbacks=[DISK], replicationFallbacks=[DISK]}
BlockStoragePolicy{LAZY_PERSIST:15, storageTypes=[RAM_DISK, DISK],
creationFallbacks=[DISK], replicationFallbacks=[DISK]}
{code}
> ViewFS: StoragePolicies commands fail with HDFS federation
> ----------------------------------------------------------
>
> Key: HDFS-11968
> URL: https://issues.apache.org/jira/browse/HDFS-11968
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs
> Affects Versions: 2.7.1
> Reporter: Mukul Kumar Singh
> Assignee: Mukul Kumar Singh
> Attachments: HDFS-11968.001.patch, HDFS-11968.002.patch,
> HDFS-11968.003.patch, HDFS-11968.004.patch, HDFS-11968.005.patch,
> HDFS-11968.006.patch, HDFS-11968.007.patch, HDFS-11968.008.patch,
> HDFS-11968.009.patch, HDFS-11968.010.patch
>
>
> hdfs storagepolicies command fails with HDFS federation.
> For storage policies commands, a given user path should be resolved to a HDFS
> path and
> storage policy command should be applied onto the resolved HDFS path.
> {code}
> static DistributedFileSystem getDFS(Configuration conf)
> throws IOException {
> FileSystem fs = FileSystem.get(conf);
> if (!(fs instanceof DistributedFileSystem)) {
> throw new IllegalArgumentException("FileSystem " + fs.getUri() +
> " is not an HDFS file system");
> }
> return (DistributedFileSystem)fs;
> }
> {code}
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