Stephen Chu created HDFS-5512:
---------------------------------
Summary: 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: tools
Affects Versions: 3.0.0
Reporter: Stephen Chu
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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