runlinzhang created HDFS-11764:
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Summary: NPE when the GroupMappingServiceProvider has no group
Key: HDFS-11764
URL: https://issues.apache.org/jira/browse/HDFS-11764
Project: Hadoop HDFS
Issue Type: Bug
Components: security
Affects Versions: 2.7.2
Reporter: runlinzhang
Priority: Critical
Fix For: 2.7.2
The following code can throw NPE if GroupMappingServiceProvider.getGroups()
returns null.
public List<String> load(String user) throws Exception {
List<String> groups = fetchGroupList(user);
if (groups.isEmpty()) {
if (isNegativeCacheEnabled()) {
negativeCache.add(user);
}
// We throw here to prevent Cache from retaining an empty group
throw noGroupsForUser(user);
}
return groups;
}
eg:image
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