Repository: accumulo Updated Branches: refs/heads/master 3fe4f690b -> 455b99aa0
ACCUMULO-3890 switch cached providers map to a ConcurrentHashMap Project: http://git-wip-us.apache.org/repos/asf/accumulo/repo Commit: http://git-wip-us.apache.org/repos/asf/accumulo/commit/df67ad23 Tree: http://git-wip-us.apache.org/repos/asf/accumulo/tree/df67ad23 Diff: http://git-wip-us.apache.org/repos/asf/accumulo/diff/df67ad23 Branch: refs/heads/master Commit: df67ad236450526086d31f47bdece65ae2c2f023 Parents: a2e131b Author: Billie Rinaldi <bil...@apache.org> Authored: Thu Jun 11 10:33:14 2015 -0700 Committer: Billie Rinaldi <bil...@apache.org> Committed: Thu Jun 11 11:54:44 2015 -0700 ---------------------------------------------------------------------- .../conf/CredentialProviderFactoryShim.java | 24 +++++++++----------- 1 file changed, 11 insertions(+), 13 deletions(-) ---------------------------------------------------------------------- http://git-wip-us.apache.org/repos/asf/accumulo/blob/df67ad23/core/src/main/java/org/apache/accumulo/core/conf/CredentialProviderFactoryShim.java ---------------------------------------------------------------------- diff --git a/core/src/main/java/org/apache/accumulo/core/conf/CredentialProviderFactoryShim.java b/core/src/main/java/org/apache/accumulo/core/conf/CredentialProviderFactoryShim.java index 9af3e00..388f3ca 100644 --- a/core/src/main/java/org/apache/accumulo/core/conf/CredentialProviderFactoryShim.java +++ b/core/src/main/java/org/apache/accumulo/core/conf/CredentialProviderFactoryShim.java @@ -21,9 +21,8 @@ import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.util.ArrayList; import java.util.Collections; -import java.util.HashMap; import java.util.List; -import java.util.Map; +import java.util.concurrent.ConcurrentHashMap; import org.apache.accumulo.core.util.CachedConfiguration; import org.apache.hadoop.conf.Configuration; @@ -65,7 +64,7 @@ public class CredentialProviderFactoryShim { private static Boolean hadoopClassesAvailable = null; // access to cachedProviders should be synchronized when necessary (for example see getCredentialProviders) - private static final Map<String,List<Object>> cachedProviders = new HashMap<String,List<Object>>(); + private static final ConcurrentHashMap<String,List<Object>> cachedProviders = new ConcurrentHashMap<String,List<Object>>(); /** * Determine if we can load the necessary CredentialProvider classes. Only loaded the first time, so subsequent invocations of this method should return fast. @@ -210,8 +209,9 @@ public class CredentialProviderFactoryShim { return null; } - if (cachedProviders.containsKey(path)) { - return cachedProviders.get(path); + List<Object> providersList = cachedProviders.get(path); + if (providersList != null) { + return providersList; } // Call CredentialProviderFactory.getProviders(Configuration) @@ -231,15 +231,13 @@ public class CredentialProviderFactoryShim { // Cast the Object to List<Object> (actually List<CredentialProvider>) try { - List<Object> providersList = (List<Object>) providersObj; - synchronized (cachedProviders) { - if (cachedProviders.containsKey(path)) { - return cachedProviders.get(path); - } else { - cachedProviders.put(path, providersList); - } + providersList = (List<Object>) providersObj; + List<Object> previousValue = cachedProviders.putIfAbsent(path, providersList); + if (previousValue != null) { + return previousValue; + } else { + return providersList; } - return providersList; } catch (ClassCastException e) { log.error("Expected a List from {} method", HADOOP_CRED_PROVIDER_FACTORY_GET_PROVIDERS_METHOD_NAME, e); return null;
