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https://issues.apache.org/jira/browse/HDFS-5567?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13833304#comment-13833304
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Colin Patrick McCabe commented on HDFS-5567:
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I think we need a {{\-ns}} option, like we have for the haadmin commands.
> CacheAdmin operations not supported with viewfs
> -----------------------------------------------
>
> Key: HDFS-5567
> URL: https://issues.apache.org/jira/browse/HDFS-5567
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: caching
> Affects Versions: 3.0.0
> Reporter: Stephen Chu
>
> On a federated cluster with viewfs configured, we'll run into the following
> error when using CacheAdmin commands:
> {code}
> bash-4.1$ hdfs cacheadmin -listPools
> Exception in thread "main" java.lang.IllegalArgumentException: FileSystem
> viewfs://cluster3/ is not an HDFS file system
> at org.apache.hadoop.hdfs.tools.CacheAdmin.getDFS(CacheAdmin.java:96)
> at
> org.apache.hadoop.hdfs.tools.CacheAdmin.access$100(CacheAdmin.java:50)
> at
> org.apache.hadoop.hdfs.tools.CacheAdmin$ListCachePoolsCommand.run(CacheAdmin.java:748)
> at org.apache.hadoop.hdfs.tools.CacheAdmin.run(CacheAdmin.java:84)
> at org.apache.hadoop.hdfs.tools.CacheAdmin.main(CacheAdmin.java:89)
> bash-4.1$
> {code}
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