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HADOOP-14195. CredentialProviderFactory$getProviders is not thread-safe. Contributed by Vihang Karajgaonkar. 

(cherry picked from commit 128015584d)
This commit is contained in:
John Zhuge 2017-03-23 13:58:11 -07:00
parent 47d3c29e30
commit a92f654aa2
1 changed files with 10 additions and 6 deletions
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16
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/alias/CredentialProviderFactory.java
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@ -54,12 +54,16 @@ public static List<CredentialProvider> getProviders(Configuration conf
try {
URI uri = new URI(path);
boolean found = false;
for(CredentialProviderFactory factory: serviceLoader) {
CredentialProvider kp = factory.createProvider(uri, conf);
if (kp != null) {
result.add(kp);
found = true;
break;
// Iterate serviceLoader in a synchronized block since
// serviceLoader iterator is not thread-safe.
synchronized (serviceLoader) {
for (CredentialProviderFactory factory : serviceLoader) {
CredentialProvider kp = factory.createProvider(uri, conf);
if (kp != null) {
result.add(kp);
found = true;
break;
}
}
}
if (!found) {