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https://issues.apache.org/jira/browse/HADOOP-2953?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12575927#action_12575927
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Tsz Wo (Nicholas), SZE commented on HADOOP-2953:
------------------------------------------------
- The command `bash -c groups` is used to obtain group information and the
NameNode cannot be started if group information is not available.
- We certainly should have some better error messages.
> namenode doesn't start if group id cannot be resolved to name
> -------------------------------------------------------------
>
> Key: HADOOP-2953
> URL: https://issues.apache.org/jira/browse/HADOOP-2953
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.16.0
> Environment: Linux n510 2.6.22-3-686 #1 SMP Mon Nov 12 08:32:57 UTC
> 2007 i686 GNU/Linux
> Java:
> java version "1.5.0_14"
> Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_14-b03)
> Java HotSpot(TM) Client VM (build 1.5.0_14-b03, mixed mode, sharing)
> PAM: ldap
> Reporter: Andrew Gudkov
> Priority: Minor
>
> Namenode failes to start because unix group name for my user can't be got.
> First, system threw rather obscure message:
> {quote}
> ERROR dfs.NameNode (NameNode.java:main(856)) - java.lang.NullPointerException
> at org.apache.hadoop.dfs.FSNamesystem.close(FSNamesystem.java:428)
> at org.apache.hadoop.dfs.FSNamesystem.<init>(FSNamesystem.java:237)
> at org.apache.hadoop.dfs.NameNode.initialize(NameNode.java:130)
> at org.apache.hadoop.dfs.NameNode.<init>(NameNode.java:175)
> at org.apache.hadoop.dfs.NameNode.<init>(NameNode.java:161)
> at org.apache.hadoop.dfs.NameNode.createNameNode(NameNode.java:843)
> at org.apache.hadoop.dfs.NameNode.main(NameNode.java:852)
> {quote}
> I traversed through stack trace entries, and found (FSNamesystem:237) this
> code
> {quote}
> 233 FSNamesystem(NameNode nn, Configuration conf) throws IOException {
> 234 try {
> 235 initialize(nn, conf);
> 236 } catch(IOException e) {
> 237 close();
> 238 throw e;
> 239 }
> 240 }
> {quote}
> Inserting e.printStackTrace() gave me next
> {quote}
> dfs.NameNodeMetrics (NameNodeMetrics.java:<init>(76)) - Initializing
> NameNodeMeterics using context
> object:org.apache.hadoop.metrics.spi.NullContext
> java.io.IOException: javax.security.auth.login.LoginException: Login failed:
> id: cannot find name for group ID 1040
> at
> org.apache.hadoop.security.UnixUserGroupInformation.login(UnixUserGroupInformation.java:250)
> at
> org.apache.hadoop.security.UnixUserGroupInformation.login(UnixUserGroupInformation.java:268)
> at
> org.apache.hadoop.dfs.FSNamesystem.setConfigurationParameters(FSNamesystem.java:330)
> at
> org.apache.hadoop.dfs.FSNamesystem.initialize(FSNamesystem.java:249)
> at org.apache.hadoop.dfs.FSNamesystem.<init>(FSNamesystem.java:235)
> at org.apache.hadoop.dfs.NameNode.initialize(NameNode.java:130)
> at org.apache.hadoop.dfs.NameNode.<init>(NameNode.java:175)
> at org.apache.hadoop.dfs.NameNode.<init>(NameNode.java:161)
> at org.apache.hadoop.dfs.NameNode.createNameNode(NameNode.java:843)
> at org.apache.hadoop.dfs.NameNode.main(NameNode.java:852)
> at
> org.apache.hadoop.dfs.FSNamesystem.setConfigurationParameters(FSNamesystem.java:332)
> at
> org.apache.hadoop.dfs.FSNamesystem.initialize(FSNamesystem.java:249)
> at org.apache.hadoop.dfs.FSNamesystem.<init>(FSNamesystem.java:235)
> at org.apache.hadoop.dfs.NameNode.initialize(NameNode.java:130)
> at org.apache.hadoop.dfs.NameNode.<init>(NameNode.java:175)
> at org.apache.hadoop.dfs.NameNode.<init>(NameNode.java:161)
> at org.apache.hadoop.dfs.NameNode.createNameNode(NameNode.java:843)
> at org.apache.hadoop.dfs.NameNode.main(NameNode.java:852)
> {quote}
> And this is true - command "groups" returns the same - id: cannot find name
> for group ID 1040.
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