HDFS-7718. Store KeyProvider in ClientContext to avoid leaking key provider threads when using FileContext (Arun Suresh via Colin P. McCabe)

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -893,6 +893,9 @@ Release 2.7.0 - UNRELEASED
     HDFS-7744. Fix potential NPE in DFSInputStream after setDropBehind or
     setReadahead is called (cmccabe)
 
+    HDFS-7718. Store KeyProvider in ClientContext to avoid leaking key provider
+    threads when using FileContext (Arun Suresh via Colin P. McCabe)
+
 Release 2.6.1 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/ClientContext.java

@@ -29,6 +29,7 @@
 import org.apache.hadoop.hdfs.util.ByteArrayManager;
 
 import com.google.common.annotations.VisibleForTesting;
+import com.google.common.cache.Cache;
 
 /**
  * ClientContext contains context information for a client.
@@ -71,6 +72,10 @@ public class ClientContext {
    */
   private final DomainSocketFactory domainSocketFactory;
 
+  /**
+   * Caches key Providers for the DFSClient
+   */
+  private final KeyProviderCache keyProviderCache;
   /**
    * True if we should use the legacy BlockReaderLocal.
    */
@@ -107,6 +112,7 @@ private ClientContext(String name, Conf conf) {
         conf.shortCircuitSharedMemoryWatcherInterruptCheckMs);
     this.peerCache =
           new PeerCache(conf.socketCacheCapacity, conf.socketCacheExpiry);
+    this.keyProviderCache = new KeyProviderCache(conf.keyProviderCacheExpiryMs);
     this.useLegacyBlockReaderLocal = conf.useLegacyBlockReaderLocal;
     this.domainSocketFactory = new DomainSocketFactory(conf);
 
@@ -138,7 +144,9 @@ public static String confAsString(Conf conf) {
       append(", domainSocketDataTraffic = ").
       append(conf.domainSocketDataTraffic).
       append(", shortCircuitSharedMemoryWatcherInterruptCheckMs = ").
-      append(conf.shortCircuitSharedMemoryWatcherInterruptCheckMs);
+      append(conf.shortCircuitSharedMemoryWatcherInterruptCheckMs).
+      append(", keyProviderCacheExpiryMs = ").
+      append(conf.keyProviderCacheExpiryMs);
 
     return builder.toString();
   }
@@ -195,6 +203,10 @@ public PeerCache getPeerCache() {
     return peerCache;
   }
 
+  public KeyProviderCache getKeyProviderCache() {
+    return keyProviderCache;
+  }
+
   public boolean getUseLegacyBlockReaderLocal() {
     return useLegacyBlockReaderLocal;
   }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSClient.java

@@ -275,8 +275,6 @@ public class DFSClient implements java.io.Closeable, RemotePeerFactory,
   private static final DFSHedgedReadMetrics HEDGED_READ_METRIC =
       new DFSHedgedReadMetrics();
   private static ThreadPoolExecutor HEDGED_READ_THREAD_POOL;
-  @VisibleForTesting
-  KeyProvider provider;
   private final Sampler<?> traceSampler;
 
   /**
@@ -336,6 +334,8 @@ public static class Conf {
     final long shortCircuitMmapCacheRetryTimeout;
     final long shortCircuitCacheStaleThresholdMs;
 
+    final long keyProviderCacheExpiryMs;
+
     public Conf(Configuration conf) {
       // The hdfsTimeout is currently the same as the ipc timeout 
       hdfsTimeout = Client.getTimeout(conf);
@@ -499,6 +499,10 @@ public Conf(Configuration conf) {
       dfsclientSlowIoWarningThresholdMs = conf.getLong(
           DFSConfigKeys.DFS_CLIENT_SLOW_IO_WARNING_THRESHOLD_KEY,
           DFSConfigKeys.DFS_CLIENT_SLOW_IO_WARNING_THRESHOLD_DEFAULT);
+
+      keyProviderCacheExpiryMs = conf.getLong(
+          DFSConfigKeys.DFS_CLIENT_KEY_PROVIDER_CACHE_EXPIRY_MS,
+          DFSConfigKeys.DFS_CLIENT_KEY_PROVIDER_CACHE_EXPIRY_DEFAULT);
     }
 
     public boolean isUseLegacyBlockReaderLocal() {
@@ -638,14 +642,6 @@ public DFSClient(URI nameNodeUri, ClientProtocol rpcNamenode,
     this.authority = nameNodeUri == null? "null": nameNodeUri.getAuthority();
     this.clientName = "DFSClient_" + dfsClientConf.taskId + "_" + 
         DFSUtil.getRandom().nextInt()  + "_" + Thread.currentThread().getId();
-    provider = DFSUtil.createKeyProvider(conf);
-    if (LOG.isDebugEnabled()) {
-      if (provider == null) {
-        LOG.debug("No KeyProvider found.");
-      } else {
-        LOG.debug("Found KeyProvider: " + provider.toString());
-      }
-    }
     int numResponseToDrop = conf.getInt(
         DFSConfigKeys.DFS_CLIENT_TEST_DROP_NAMENODE_RESPONSE_NUM_KEY,
         DFSConfigKeys.DFS_CLIENT_TEST_DROP_NAMENODE_RESPONSE_NUM_DEFAULT);
@@ -961,7 +957,6 @@ private void closeAllFilesBeingWritten(final boolean abort) {
    */
   @Override
   public synchronized void close() throws IOException {
-    try {
     if(clientRunning) {
       closeAllFilesBeingWritten(false);
       clientRunning = false;
@@ -969,11 +964,6 @@ public synchronized void close() throws IOException {
       // close connections to the namenode
       closeConnectionToNamenode();
     }
-    } finally {
-      if (provider != null) {
-        provider.close();
-      }
-    }
   }
 
   /**
@@ -1382,6 +1372,7 @@ private KeyVersion decryptEncryptedDataEncryptionKey(FileEncryptionInfo
       feInfo) throws IOException {
     TraceScope scope = Trace.startSpan("decryptEDEK", traceSampler);
     try {
+      KeyProvider provider = getKeyProvider();
       if (provider == null) {
         throw new IOException("No KeyProvider is configured, cannot access" +
             " an encrypted file");
@@ -3499,12 +3490,16 @@ DFSHedgedReadMetrics getHedgedReadMetrics() {
   }
 
   public KeyProvider getKeyProvider() {
-    return provider;
+    return clientContext.getKeyProviderCache().get(conf);
   }
 
   @VisibleForTesting
-  public void setKeyProvider(KeyProviderCryptoExtension provider) {
+  public void setKeyProvider(KeyProvider provider) {
-    this.provider = provider;
+    try {
+      clientContext.getKeyProviderCache().setKeyProvider(conf, provider);
+    } catch (IOException e) {
+     LOG.error("Could not set KeyProvider !!", e);
+    }
   }
 
   /**

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java

@@ -18,6 +18,8 @@
 
 package org.apache.hadoop.hdfs;
 
+import java.util.concurrent.TimeUnit;
+
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.fs.CommonConfigurationKeys;
 import org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault;
@@ -769,4 +771,11 @@ public class DFSConfigKeys extends CommonConfigurationKeys {
   public static final String[] NNTOP_WINDOWS_MINUTES_DEFAULT = {"1","5","25"};
   public static final String DFS_PIPELINE_ECN_ENABLED = "dfs.pipeline.ecn";
   public static final boolean DFS_PIPELINE_ECN_ENABLED_DEFAULT = false;
+
+  // Key Provider Cache Expiry
+  public static final String DFS_CLIENT_KEY_PROVIDER_CACHE_EXPIRY_MS =
+      "dfs.client.key.provider.cache.expiry";
+  // 10 days
+  public static final long DFS_CLIENT_KEY_PROVIDER_CACHE_EXPIRY_DEFAULT =
+      TimeUnit.DAYS.toMillis(10);
 }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/KeyProviderCache.java

@@ -0,0 +1,109 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.hdfs;
+
+import java.io.IOException;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.TimeUnit;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.crypto.key.KeyProvider;
+
+import com.google.common.annotations.VisibleForTesting;
+import com.google.common.cache.Cache;
+import com.google.common.cache.CacheBuilder;
+import com.google.common.cache.RemovalListener;
+import com.google.common.cache.RemovalNotification;
+
+public class KeyProviderCache {
+
+  public static final Log LOG = LogFactory.getLog(KeyProviderCache.class);
+
+  private final Cache<URI, KeyProvider> cache;
+
+  public KeyProviderCache(long expiryMs) {
+    cache = CacheBuilder.newBuilder()
+        .expireAfterAccess(expiryMs, TimeUnit.MILLISECONDS)
+        .removalListener(new RemovalListener<URI, KeyProvider>() {
+          @Override
+          public void onRemoval(
+              RemovalNotification<URI, KeyProvider> notification) {
+            try {
+              notification.getValue().close();
+            } catch (Throwable e) {
+              LOG.error(
+                  "Error closing KeyProvider with uri ["
+                      + notification.getKey() + "]", e);
+              ;
+            }
+          }
+        })
+        .build();
+  }
+
+  public KeyProvider get(final Configuration conf) {
+    URI kpURI = createKeyProviderURI(conf);
+    if (kpURI == null) {
+      return null;
+    }
+    try {
+      return cache.get(kpURI, new Callable<KeyProvider>() {
+        @Override
+        public KeyProvider call() throws Exception {
+          return DFSUtil.createKeyProvider(conf);
+        }
+      });
+    } catch (Exception e) {
+      LOG.error("Could not create KeyProvider for DFSClient !!", e.getCause());
+      return null;
+    }
+  }
+
+  private URI createKeyProviderURI(Configuration conf) {
+    final String providerUriStr =
+        conf.get(DFSConfigKeys.DFS_ENCRYPTION_KEY_PROVIDER_URI, null);
+    // No provider set in conf
+    if (providerUriStr == null) {
+      LOG.error("Could not find uri with key ["
+          + DFSConfigKeys.DFS_ENCRYPTION_KEY_PROVIDER_URI
+          + "] to create a keyProvider !!");
+      return null;
+    }
+    final URI providerUri;
+    try {
+      providerUri = new URI(providerUriStr);
+    } catch (URISyntaxException e) {
+      LOG.error("KeyProvider URI string is invalid [" + providerUriStr
+          + "]!!", e.getCause());
+      return null;
+    }
+    return providerUri;
+  }
+
+  @VisibleForTesting
+  public void setKeyProvider(Configuration conf, KeyProvider keyProvider)
+      throws IOException {
+    URI uri = createKeyProviderURI(conf);
+    cache.put(uri, keyProvider);
+  }
+}

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestEncryptionZones.java

@@ -38,11 +38,13 @@
 import java.util.concurrent.Future;
 
 import com.google.common.collect.Lists;
+
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.crypto.CipherSuite;
 import org.apache.hadoop.crypto.CryptoProtocolVersion;
 import org.apache.hadoop.crypto.key.JavaKeyStoreProvider;
 import org.apache.hadoop.crypto.key.KeyProvider;
+import org.apache.hadoop.crypto.key.KeyProviderCryptoExtension;
 import org.apache.hadoop.crypto.key.KeyProviderFactory;
 import org.apache.hadoop.fs.CommonConfigurationKeysPublic;
 import org.apache.hadoop.fs.CreateFlag;
@@ -96,7 +98,6 @@
 import static org.mockito.Mockito.withSettings;
 import static org.mockito.Mockito.any;
 import static org.mockito.Mockito.anyString;
-
 import static org.apache.hadoop.hdfs.DFSTestUtil.verifyFilesEqual;
 import static org.apache.hadoop.test.GenericTestUtils.assertExceptionContains;
 import static org.junit.Assert.assertEquals;
@@ -105,6 +106,7 @@
 import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
+
 import org.xml.sax.InputSource;
 import org.xml.sax.helpers.DefaultHandler;
 
@@ -157,8 +159,8 @@ public void setup() throws Exception {
   protected void setProvider() {
     // Need to set the client's KeyProvider to the NN's for JKS,
     // else the updates do not get flushed properly
-    fs.getClient().provider = cluster.getNameNode().getNamesystem()
+    fs.getClient().setKeyProvider(cluster.getNameNode().getNamesystem()
-        .getProvider();
+        .getProvider());
   }
 
   @After
@@ -1072,7 +1074,7 @@ public void testDelegationToken() throws Exception {
         addDelegationTokens(anyString(), (Credentials)any())).
         thenReturn(new Token<?>[] { testToken });
 
-    dfs.getClient().provider = keyProvider;
+    dfs.getClient().setKeyProvider(keyProvider);
 
     Credentials creds = new Credentials();
     final Token<?> tokens[] = dfs.addDelegationTokens("JobTracker", creds);

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestEncryptionZonesWithHA.java

@@ -80,7 +80,7 @@ public void setupCluster() throws Exception {
     dfsAdmin1 = new HdfsAdmin(cluster.getURI(1), conf);
     KeyProviderCryptoExtension nn0Provider =
         cluster.getNameNode(0).getNamesystem().getProvider();
-    fs.getClient().provider = nn0Provider;
+    fs.getClient().setKeyProvider(nn0Provider);
   }
 
   @After

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestEncryptionZonesWithKMS.java

@@ -71,7 +71,7 @@ public void testCreateEZPopulatesEDEKCache() throws Exception {
     final Path zonePath = new Path("/TestEncryptionZone");
     fsWrapper.mkdir(zonePath, FsPermission.getDirDefault(), false);
     dfsAdmin.createEncryptionZone(zonePath, TEST_KEY);
-    assertTrue(((KMSClientProvider)fs.getClient().provider).
+    assertTrue(((KMSClientProvider)fs.getClient().getKeyProvider()).
         getEncKeyQueueSize(TEST_KEY) > 0);
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestKeyProviderCache.java

@@ -0,0 +1,124 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.hdfs;
+
+import java.io.IOException;
+import java.net.URI;
+import java.util.List;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.crypto.key.KeyProvider;
+import org.apache.hadoop.crypto.key.KeyProviderFactory;
+import org.apache.hadoop.crypto.key.kms.KMSClientProvider;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class TestKeyProviderCache {
+
+  public static class DummyKeyProvider extends KeyProvider {
+
+    public DummyKeyProvider(Configuration conf) {
+      super(conf);
+    }
+
+    @Override
+    public KeyVersion getKeyVersion(String versionName) throws IOException {
+      return null;
+    }
+
+    @Override
+    public List<String> getKeys() throws IOException {
+      return null;
+    }
+
+    @Override
+    public List<KeyVersion> getKeyVersions(String name) throws IOException {
+      return null;
+    }
+
+    @Override
+    public Metadata getMetadata(String name) throws IOException {
+      return null;
+    }
+
+    @Override
+    public KeyVersion createKey(String name, byte[] material, Options options)
+        throws IOException {
+      return null;
+    }
+
+    @Override
+    public void deleteKey(String name) throws IOException {
+    }
+
+    @Override
+    public KeyVersion rollNewVersion(String name, byte[] material)
+        throws IOException {
+      return null;
+    }
+
+    @Override
+    public void flush() throws IOException {
+    }
+
+  }
+
+  public static class Factory extends KeyProviderFactory {
+
+    @Override
+    public KeyProvider createProvider(URI providerName, Configuration conf)
+        throws IOException {
+      if ("dummy".equals(providerName.getScheme())) {
+        return new DummyKeyProvider(conf);
+      }
+      return null;
+    }
+  }
+
+  @Test
+  public void testCache() throws Exception {
+    KeyProviderCache kpCache = new KeyProviderCache(10000);
+    Configuration conf = new Configuration();
+    conf.set(DFSConfigKeys.DFS_ENCRYPTION_KEY_PROVIDER_URI,
+        "dummy://foo:bar@test_provider1");
+    KeyProvider keyProvider1 = kpCache.get(conf);
+    Assert.assertNotNull("Returned Key Provider is null !!", keyProvider1);
+
+    conf.set(DFSConfigKeys.DFS_ENCRYPTION_KEY_PROVIDER_URI,
+        "dummy://foo:bar@test_provider1");
+    KeyProvider keyProvider2 = kpCache.get(conf);
+
+    Assert.assertTrue("Different KeyProviders returned !!",
+        keyProvider1 == keyProvider2);
+
+    conf.set(DFSConfigKeys.DFS_ENCRYPTION_KEY_PROVIDER_URI,
+        "dummy://test_provider3");
+    KeyProvider keyProvider3 = kpCache.get(conf);
+
+    Assert.assertFalse("Same KeyProviders returned !!",
+        keyProvider1 == keyProvider3);
+
+    conf.set(DFSConfigKeys.DFS_ENCRYPTION_KEY_PROVIDER_URI,
+        "dummy://hello:there@test_provider1");
+    KeyProvider keyProvider4 = kpCache.get(conf);
+
+    Assert.assertFalse("Same KeyProviders returned !!",
+        keyProvider1 == keyProvider4);
+
+  }
+}

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestReservedRawPaths.java

@@ -81,8 +81,8 @@ public void setup() throws Exception {
     dfsAdmin = new HdfsAdmin(cluster.getURI(), conf);
     // Need to set the client's KeyProvider to the NN's for JKS,
     // else the updates do not get flushed properly
-    fs.getClient().provider = cluster.getNameNode().getNamesystem()
+    fs.getClient().setKeyProvider(cluster.getNameNode().getNamesystem()
-        .getProvider();
+        .getProvider());
     DFSTestUtil.createKey(TEST_KEY, cluster, conf);
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/resources/META-INF/services/org.apache.hadoop.crypto.key.KeyProviderFactory

@@ -0,0 +1,16 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+org.apache.hadoop.hdfs.TestKeyProviderCache$Factory