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https://issues.apache.org/jira/browse/HDFS-8332?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14530134#comment-14530134
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Rakesh R commented on HDFS-8332:
--------------------------------
Attached patch where it checks the file system is open to perform the {{cache}}
operations.
> DistributedFileSystem listCacheDirectives() and listCachePools() API calls
> should check filesystem closed
> ---------------------------------------------------------------------------------------------------------
>
> Key: HDFS-8332
> URL: https://issues.apache.org/jira/browse/HDFS-8332
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Rakesh R
> Assignee: Rakesh R
> Attachments: HDFS-8332-000.patch
>
>
> I could see {{listCacheDirectives()}} and {{listCachePools()}} APIs can be
> called even after the filesystem close. Instead these calls should do
> {{checkOpen}} and throws:
> {code}
> java.io.IOException: Filesystem closed
> at org.apache.hadoop.hdfs.DFSClient.checkOpen(DFSClient.java:464)
> {code}
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