[SENTRY-678] Sentry-Solr Binding may not load group mapping service correctly

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.3.0
• Fix Version/s: 1.6.0
• Assignee: Gregory Chanan
• Reporter: Gregory Chanan
• Created: 23/Mar/15 23:17
• Updated: 23/Apr/15 22:01
• Resolved: 23/Apr/15 22:01

Description

The user sets up LdapGroupMapping in the core-site.xml config. Imagine this file is not on the classpath.

Then, consider the following stacktrace:

	at org.apache.hadoop.security.Groups.parseStaticMapping(Groups.java:104)
	at org.apache.hadoop.security.Groups.<init>(Groups.java:86)
	at org.apache.hadoop.security.Groups.<init>(Groups.java:66)
	at org.apache.hadoop.security.Groups.getUserToGroupsMappingService(Groups.java:280)
	at org.apache.hadoop.security.UserGroupInformation.initialize(UserGroupInformation.java:283)
	at org.apache.hadoop.security.UserGroupInformation.ensureInitialized(UserGroupInformation.java:260)
	at org.apache.hadoop.security.UserGroupInformation.loginUserFromSubject(UserGroupInformation.java:804)
	at org.apache.hadoop.security.UserGroupInformation.getLoginUser(UserGroupInformation.java:774)
	at org.apache.hadoop.security.UserGroupInformation.getCurrentUser(UserGroupInformation.java:647)
	at org.apache.hadoop.fs.FileSystem$Cache$Key.<init>(FileSystem.java:2753)
	at org.apache.hadoop.fs.FileSystem$Cache$Key.<init>(FileSystem.java:2745)
	at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2611)
	at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:370)
	at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:169)
	at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:354)
	at org.apache.hadoop.fs.Path.getFileSystem(Path.java:296)
	at org.apache.sentry.provider.file.SimpleFileProviderBackend.<init>(SimpleFileProviderBackend.java:118)
	at org.apache.sentry.provider.file.SimpleFileProviderBackend.<init>(SimpleFileProviderBackend.java:112)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
	at org.apache.sentry.binding.solr.authz.SolrAuthzBinding.getAuthProvider(SolrAuthzBinding.java:92)
	at org.apache.sentry.binding.solr.authz.SolrAuthzBinding.<init>(SolrAuthzBinding.java:65)

If you follow this, you'll notice the GroupMappingService is initialized with the default (classpath) Configuration, even though we always specified the Configuration to use. This may be a hadoop bug – I'll file a separate jira for that – but we should workaround and test this in the meantime.