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From "Larry McCay (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-11934) Use of JavaKeyStoreProvider in LdapGroupsMapping causes infinite loop
Date Thu, 07 May 2015 16:32:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-11934?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14532953#comment-14532953
] 

Larry McCay commented on HADOOP-11934:
--------------------------------------

Based on your log it seems to be running inside the NameNode.
This issue can be addressed by a new localkeystore provider that doesn't use the filesystem
abstraction.

The only downside is that it won't be able to get to keystores that are stored inside of HDFS.

I can try and crank out a provider for this in short order.

Thanks for the log info that is very helpful!

> Use of JavaKeyStoreProvider in LdapGroupsMapping causes infinite loop
> ---------------------------------------------------------------------
>
>                 Key: HADOOP-11934
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11934
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: security
>    Affects Versions: 2.6.0
>            Reporter: Mike Yoder
>            Assignee: Larry McCay
>
> I was attempting to use the LdapGroupsMapping code and the JavaKeyStoreProvider at the
same time, and hit a really interesting, yet fatal, issue.  The code goes into what ought
to have been an infinite loop, were it not for it overflowing the stack and Java ending the
loop.  Here is a snippet of the stack; my annotations are at the bottom.
> {noformat}
> 	at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:370)
> 	at org.apache.hadoop.fs.Path.getFileSystem(Path.java:296)
> 	at org.apache.hadoop.security.alias.JavaKeyStoreProvider.<init>(JavaKeyStoreProvider.java:88)
> 	at org.apache.hadoop.security.alias.JavaKeyStoreProvider.<init>(JavaKeyStoreProvider.java:65)
> 	at org.apache.hadoop.security.alias.JavaKeyStoreProvider$Factory.createProvider(JavaKeyStoreProvider.java:291)
> 	at org.apache.hadoop.security.alias.CredentialProviderFactory.getProviders(CredentialProviderFactory.java:58)
> 	at org.apache.hadoop.conf.Configuration.getPasswordFromCredentialProviders(Configuration.java:1863)
> 	at org.apache.hadoop.conf.Configuration.getPassword(Configuration.java:1843)
> 	at org.apache.hadoop.security.LdapGroupsMapping.getPassword(LdapGroupsMapping.java:386)
> 	at org.apache.hadoop.security.LdapGroupsMapping.setConf(LdapGroupsMapping.java:349)
> 	at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:73)
> 	at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:133)
> 	at org.apache.hadoop.security.Groups.<init>(Groups.java:70)
> 	at org.apache.hadoop.security.Groups.<init>(Groups.java:66)
> 	at org.apache.hadoop.security.Groups.getUserToGroupsMappingService(Groups.java:280)
> 	at org.apache.hadoop.security.UserGroupInformation.initialize(UserGroupInformation.java:283)
> 	at org.apache.hadoop.security.UserGroupInformation.ensureInitialized(UserGroupInformation.java:260)
> 	at org.apache.hadoop.security.UserGroupInformation.loginUserFromSubject(UserGroupInformation.java:804)
> 	at org.apache.hadoop.security.UserGroupInformation.getLoginUser(UserGroupInformation.java:774)
> 	at org.apache.hadoop.security.UserGroupInformation.getCurrentUser(UserGroupInformation.java:647)
> 	at org.apache.hadoop.fs.FileSystem$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.Path.getFileSystem(Path.java:296)
> 	at org.apache.hadoop.security.alias.JavaKeyStoreProvider.<init>(JavaKeyStoreProvider.java:88)
> 	at org.apache.hadoop.security.alias.JavaKeyStoreProvider.<init>(JavaKeyStoreProvider.java:65)
> 	at org.apache.hadoop.security.alias.JavaKeyStoreProvider$Factory.createProvider(JavaKeyStoreProvider.java:291)
> 	at org.apache.hadoop.security.alias.CredentialProviderFactory.getProviders(CredentialProviderFactory.java:58)
> 	at org.apache.hadoop.conf.Configuration.getPasswordFromCredentialProviders(Configuration.java:1863)
> 	at org.apache.hadoop.conf.Configuration.getPassword(Configuration.java:1843)
> 	at org.apache.hadoop.security.LdapGroupsMapping.getPassword(LdapGroupsMapping.java:386)
> 	at org.apache.hadoop.security.LdapGroupsMapping.setConf(LdapGroupsMapping.java:349)
> 	at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:73)
> 	at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:133)
> 	at org.apache.hadoop.security.Groups.<init>(Groups.java:70)
> 	at org.apache.hadoop.security.Groups.<init>(Groups.java:66)
> 	at org.apache.hadoop.security.Groups.getUserToGroupsMappingService(Groups.java:280)
> 	at org.apache.hadoop.security.UserGroupInformation.initialize(UserGroupInformation.java:283)
> 	at org.apache.hadoop.security.UserGroupInformation.ensureInitialized(UserGroupInformation.java:260)
> 	at org.apache.hadoop.security.UserGroupInformation.loginUserFromSubject(UserGroupInformation.java:804)
> 	at org.apache.hadoop.security.UserGroupInformation.getLoginUser(UserGroupInformation.java:774)
> 	at org.apache.hadoop.security.UserGroupInformation.getCurrentUser(UserGroupInformation.java:647)
> 	at org.apache.hadoop.fs.FileSystem$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.Path.getFileSystem(Path.java:296){noformat}
> Here's my annotation, going from bottom to top.
> * Somehow we enter Path.getFileSystem()
> * This goes to FileSystem cache stuff, and then it wants the current user
> * So we get to UserGroupInformation.getCurrentUser(), which as you can imagine gets to
> * getUserToGroupsMappingService and thence to LdapGroupsMapping.setConf().
> * That code gets the needed passwords, and we're using the CredentialProvider, so unsurprisingly
we get to
> * getPasswordFromCredentialProviders() - which chooses the JavaKeyStoreProvider like
I told it to.
> * The JavaKeyStoreProvider, in its constructor, does "fs = path.getFileSystem(conf);"
> * And guess what, we're back in Path.getFileSystem, where we started at the beginning.
> Please let me know if I've somehow configured something incorrectly, but if I have I
can't figure out what it is...



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