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HADOOP-10829. Iteration on CredentialProviderFactory.serviceLoader is thread-unsafe. Contributed by Benoy Antony and Rakesh R.

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This commit is contained in:
Jitendra Pandey 2017-07-07 12:45:37 -07:00
parent 5496a34c0c
commit f1efa14fc6
1 changed files with 10 additions and 0 deletions
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hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/alias/CredentialProviderFactory.java
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@ -22,6 +22,7 @@
import java.net.URI; import java.net.URI;
import java.net.URISyntaxException; import java.net.URISyntaxException;
import java.util.ArrayList; import java.util.ArrayList;
import java.util.Iterator;
import java.util.List; import java.util.List;
import java.util.ServiceLoader; import java.util.ServiceLoader;
@ -49,6 +50,15 @@ public abstract CredentialProvider createProvider(URI providerName,
ServiceLoader.load(CredentialProviderFactory.class, ServiceLoader.load(CredentialProviderFactory.class,
CredentialProviderFactory.class.getClassLoader()); CredentialProviderFactory.class.getClassLoader());
// Iterate through the serviceLoader to avoid lazy loading.
// Lazy loading would require synchronization in concurrent use cases.
static {
Iterator<CredentialProviderFactory> iterServices = serviceLoader.iterator();
while (iterServices.hasNext()) {
iterServices.next();
}
}
public static List<CredentialProvider> getProviders(Configuration conf public static List<CredentialProvider> getProviders(Configuration conf
) throws IOException { ) throws IOException {
List<CredentialProvider> result = new ArrayList<CredentialProvider>(); List<CredentialProvider> result = new ArrayList<CredentialProvider>();