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https://issues.apache.org/jira/browse/HDFS-8332?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14545373#comment-14545373
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Rakesh R commented on HDFS-8332:
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Thanks [~vinayrpet] and [~umamahesh] for finding out the root cause.
bq. IMO, incompatible change is only when the user's valid code fails. Not when
error code fails after change.
True. +1(non-binding) from me
> DFS client 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
> Fix For: 2.8.0
>
> Attachments: HDFS-8332-000.patch, HDFS-8332-001.patch,
> HDFS-8332-002-Branch-2.patch, HDFS-8332-002.patch,
> HDFS-8332.001.branch-2.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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