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https://issues.apache.org/jira/browse/HDFS-5512?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Wang updated HDFS-5512:
------------------------------
Component/s: caching
> CacheAdmin -listPools fails with NPE when user lacks permissions to view all
> pools
> ----------------------------------------------------------------------------------
>
> Key: HDFS-5512
> URL: https://issues.apache.org/jira/browse/HDFS-5512
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: caching, tools
> Affects Versions: 3.0.0
> Reporter: Stephen Chu
> Assignee: Andrew Wang
> Attachments: hdfs-5512-1.patch
>
>
> https://issues.apache.org/jira/browse/HDFS-5471 (CacheAdmin -listPools fails
> when user lacks permissions to view all pools) was recently resolved, but on
> a build with this fix, I am running into another error when using cacheadmin
> -listPools.
> Now, when the user does not have permissions to view all the pools, the
> cacheadmin -listPools command will throw a NullPointerException.
> On a system with a single pool "root" with a mode of 750, I see this as user
> schu:
> {code}
> [schu@hdfs-c5-nfs ~]$ hdfs cacheadmin -listPools
> Exception in thread "main" java.lang.NullPointerException
> at
> org.apache.hadoop.hdfs.tools.CacheAdmin$ListCachePoolsCommand.run(CacheAdmin.java:745)
> at org.apache.hadoop.hdfs.tools.CacheAdmin.run(CacheAdmin.java:82)
> at org.apache.hadoop.hdfs.tools.CacheAdmin.main(CacheAdmin.java:87)
> {code}
> After we modify the root pool to 755, then -listPools works properly.
> {code}
> [schu@hdfs-c5-nfs ~]$ hdfs cacheadmin -listPools
> Found 1 result.
> NAME OWNER GROUP MODE WEIGHT
> root root root rwxr-xr-x 100
> [schu@hdfs-c5-nfs ~]$
> {code}
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