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From "Trevor Powell (Resolved) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HADOOP-7750) DataNode: Cannot start secure cluster without privileged resources | tags/release-0.20.205.0-rc2
Date Sun, 06 Nov 2011 00:54:51 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-7750?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Trevor Powell resolved HADOOP-7750.
-----------------------------------

    Resolution: Not A Problem
    
> DataNode: Cannot start secure cluster without privileged resources  | tags/release-0.20.205.0-rc2
> -------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-7750
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7750
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 0.20.205.1
>         Environment: Linux RHEL5 64bit
> sunjava2 1.6.0r14
> http://svn.apache.org/repos/asf/hadoop/common/tags/release-0.20.205.0-rc2/branch-0.20-security-205/src/hdfs/org/apache/hadoop/hdfs/server/datanode/DataNode.java
>            Reporter: Trevor Powell
>              Labels: hdfs
>
> This tag compiles just fine. But after configuring it, the datanode fails on startup
with the below error:
> TARTUP_MSG: Starting DataNode
> STARTUP_MSG:   host = hd3w94m7/10.152.94.111
> STARTUP_MSG:   args = []
> STARTUP_MSG:   version = 0.20.205.1
> STARTUP_MSG:   build = http://svn.apache.org/repos/asf/hadoop/common/tags/release-0.20.205.0-rc2
-r 1179942; compiled by 'tpowell1' on Wed Oct 12 11:14:46 PDT 2011
> ************************************************************/
> 2011-10-14 15:24:56,028 INFO org.apache.hadoop.metrics2.impl.MetricsConfig: loaded properties
from hadoop-metrics2.properties
> 2011-10-14 15:24:56,043 INFO org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean
for source MetricsSystem,sub=Stats registered.
> 2011-10-14 15:24:56,044 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Scheduled
snapshot period at 10 second(s).
> 2011-10-14 15:24:56,044 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: DataNode
metrics system started
> 2011-10-14 15:24:56,192 INFO org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean
for source ugi registered.
> 2011-10-14 15:24:56,421 INFO org.apache.hadoop.security.UserGroupInformation: Asked the
TGT renewer thread to terminate
> 2011-10-14 15:24:57,241 INFO org.apache.hadoop.security.UserGroupInformation: Login successful
for user hdfs/hd3w94m7@XXX using keytab file /home/tpowell1/hadoop.tags.release-0.20.205.0-rc2/conf/hdfs.keytab
> 2011-10-14 15:24:57,242 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: java.lang.RuntimeException:
Cannot start secure cluster without privileged resources.
>         at org.apache.hadoop.hdfs.server.datanode.DataNode.startDataNode(DataNode.java:306)
>         at org.apache.hadoop.hdfs.server.datanode.DataNode.<init>(DataNode.java:281)
>         at org.apache.hadoop.hdfs.server.datanode.DataNode.makeInstance(DataNode.java:1545)
>         at org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:1484)
>         at org.apache.hadoop.hdfs.server.datanode.DataNode.createDataNode(DataNode.java:1502)
>         at org.apache.hadoop.hdfs.server.datanode.DataNode.secureMain(DataNode.java:1628)
>         at org.apache.hadoop.hdfs.server.datanode.DataNode.main(DataNode.java:1645)
> 2011-10-14 15:24:57,243 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: SHUTDOWN_MSG:
> /************************************************************
> SHUTDOWN_MSG: Shutting down DataNode at hd3w94m7.XXX/10.152.94.111
> ************************************************************/
> Checking the Datanode.java code it is started with a null SecureResources .
>   public static void main(String args[]) {
>     secureMain(args, null);
>   }
> This null resource seems to get passed all the way down to startDataNode() where there
is a null check... which in turns throws the error we see.
>   void startDataNode(Configuration conf,
>                      AbstractList<File> dataDirs, SecureResources resources
>                      ) throws IOException {
>     if(UserGroupInformation.isSecurityEnabled() && resources == null)
>       throw new RuntimeException("Cannot start secure cluster without " +
>                 "privileged resources.");

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