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merge -c 1504874 FIXES: HADOOP-9748. Reduce blocking on UGI.ensureInitialized (daryn) 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1504875 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Daryn Sharp 2013-07-19 13:39:50 +00:00
parent f6b0fa487b
commit 69aaf11467
2 changed files with 8 additions and 2 deletions
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2
hadoop-common-project/hadoop-common/CHANGES.txt
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@ -27,6 +27,8 @@ Release 2.3.0 - UNRELEASED
OPTIMIZATIONS
HADOOP-9748. Reduce blocking on UGI.ensureInitialized (daryn)
BUG FIXES
HADOOP-9582. Non-existent file to "hadoop fs -conf" doesn't throw error

8
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/UserGroupInformation.java
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@ -208,9 +208,13 @@ public class UserGroupInformation {
* A method to initialize the fields that depend on a configuration.
* Must be called before useKerberos or groups is used.
*/
private static synchronized void ensureInitialized() {
private static void ensureInitialized() {
if (conf == null) {
initialize(new Configuration(), false);
synchronized(UserGroupInformation.class) {
if (conf == null) { // someone might have beat us
initialize(new Configuration(), false);
}
}
}
}