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From "Eli Collins (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-7033) getUserToGroupsMappingService is not thread safe
Date Sun, 14 Nov 2010 06:52:14 GMT
getUserToGroupsMappingService is not thread safe

                 Key: HADOOP-7033
                 URL: https://issues.apache.org/jira/browse/HADOOP-7033
             Project: Hadoop Common
          Issue Type: Bug
          Components: security
    Affects Versions: 0.22.0
            Reporter: Eli Collins
             Fix For: 0.22.0

test-patch on trunk reports the following findbugs warning:

Incorrect lazy initialization of static field org.apache.hadoop.security.Groups.GROUPS in
Bug type LI_LAZY_INIT_STATIC (click for details) 
In class org.apache.hadoop.security.Groups
In method org.apache.hadoop.security.Groups.getUserToGroupsMappingService(Configuration)
On field org.apache.hadoop.security.Groups.GROUPS
At Groups.java:[lines 138-142]

The relevant code:

  public static Groups getUserToGroupsMappingService(Configuration conf) {
    if(GROUPS == null) {
      if(LOG.isDebugEnabled()) {
        LOG.debug(" Creating new Groups object");
      GROUPS = new Groups(conf);
    return GROUPS;

This is problematic if getUserToGroupsMappingService can accessed simultaneously by multiple

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