HDFS-16705. RBF supports healthMonitor timeout configurable and caching NN and client proxy in NamenodeHeartbeatService

Author: zengqiang.xu

hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/NamenodeHeartbeatService.java

@@ -17,6 +17,8 @@
  */
 package org.apache.hadoop.hdfs.server.federation.router;
 
+import static org.apache.hadoop.hdfs.server.federation.router.RBFConfigKeys.DFS_ROUTER_HEALTH_MONITOR_TIMEOUT;
+import static org.apache.hadoop.hdfs.server.federation.router.RBFConfigKeys.DFS_ROUTER_HEALTH_MONITOR_TIMEOUT_DEFAULT;
 import static org.apache.hadoop.hdfs.server.federation.router.RBFConfigKeys.DFS_ROUTER_HEARTBEAT_INTERVAL_MS;
 import static org.apache.hadoop.hdfs.server.federation.router.RBFConfigKeys.DFS_ROUTER_HEARTBEAT_INTERVAL_MS_DEFAULT;
 
@@ -25,6 +27,7 @@
 import java.net.InetSocketAddress;
 import java.net.URI;
 import java.util.Map;
+import java.util.concurrent.TimeUnit;
 
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.ha.HAServiceProtocol;
@@ -85,6 +88,10 @@ public class NamenodeHeartbeatService extends PeriodicService {
   private NNHAServiceTarget localTarget;
   /** Cache HA protocol. */
   private HAServiceProtocol localTargetHAProtocol;
+  /** Cache NN protocol. */
+  private NamenodeProtocol namenodeProtocol;
+  /** Cache Client protocol. */
+  private ClientProtocol clientProtocol;
   /** RPC address for the namenode. */
   private String rpcAddress;
   /** Service RPC address for the namenode. */
@@ -100,6 +107,9 @@ public class NamenodeHeartbeatService extends PeriodicService {
 
   private String resolvedHost;
   private String originalNnId;
+
+  private int healthMonitorTimeoutMs = (int) DFS_ROUTER_HEALTH_MONITOR_TIMEOUT_DEFAULT;
+
   /**
    * Create a new Namenode status updater.
    * @param resolver Namenode resolver service to handle NN registration.
@@ -211,6 +221,15 @@ protected void serviceInit(Configuration configuration) throws Exception {
         DFS_ROUTER_HEARTBEAT_INTERVAL_MS,
         DFS_ROUTER_HEARTBEAT_INTERVAL_MS_DEFAULT));
 
+    long timeoutMs = conf.getTimeDuration(DFS_ROUTER_HEALTH_MONITOR_TIMEOUT,
+        DFS_ROUTER_HEALTH_MONITOR_TIMEOUT_DEFAULT, TimeUnit.MILLISECONDS);
+    if (timeoutMs < 0) {
+      LOG.warn("Invalid value {} configured for {} should be greater than or equal to 0. " +
+          "Using value of : 0ms instead.", timeoutMs, DFS_ROUTER_HEALTH_MONITOR_TIMEOUT);
+      this.healthMonitorTimeoutMs = 0;
+    } else {
+      this.healthMonitorTimeoutMs = (int) timeoutMs;
+    }
 
     super.serviceInit(configuration);
   }
@@ -309,66 +328,26 @@ protected NamenodeStatusReport getNamenodeStatusReport() {
       LOG.debug("Probing NN at service address: {}", serviceAddress);
 
       URI serviceURI = new URI("hdfs://" + serviceAddress);
-      // Read the filesystem info from RPC (required)
-      NamenodeProtocol nn = NameNodeProxies
-          .createProxy(this.conf, serviceURI, NamenodeProtocol.class)
-          .getProxy();
 
-      if (nn != null) {
-        NamespaceInfo info = nn.versionRequest();
-        if (info != null) {
-          report.setNamespaceInfo(info);
-        }
-      }
+      // Read the filesystem info from RPC (required)
+      updateNameSpaceInfoParameters(serviceURI, report);
       if (!report.registrationValid()) {
         return report;
       }
 
       // Check for safemode from the client protocol. Currently optional, but
       // should be required at some point for QoS
-      try {
-        ClientProtocol client = NameNodeProxies
-            .createProxy(this.conf, serviceURI, ClientProtocol.class)
-            .getProxy();
-        if (client != null) {
-          boolean isSafeMode = client.setSafeMode(
-              SafeModeAction.SAFEMODE_GET, false);
-          report.setSafeMode(isSafeMode);
-        }
-      } catch (Exception e) {
-        LOG.error("Cannot fetch safemode state for {}", getNamenodeDesc(), e);
-      }
+      updateSafeModeParameters(serviceURI, report);
 
       // Read the stats from JMX (optional)
       updateJMXParameters(webAddress, report);
 
-      if (localTarget != null) {
-        // Try to get the HA status
-        try {
-          // Determine if NN is active
-          // TODO: dynamic timeout
-          if (localTargetHAProtocol == null) {
-            localTargetHAProtocol = localTarget.getHealthMonitorProxy(conf, 30*1000);
-            LOG.debug("Get HA status with address {}", lifelineAddress);
-          }
-          HAServiceStatus status = localTargetHAProtocol.getServiceStatus();
-          report.setHAServiceState(status.getState());
-        } catch (Throwable e) {
-          if (e.getMessage().startsWith("HA for namenode is not enabled")) {
-            LOG.error("HA for {} is not enabled", getNamenodeDesc());
-            localTarget = null;
-          } else {
-            // Failed to fetch HA status, ignoring failure
-            LOG.error("Cannot fetch HA status for {}: {}",
-                getNamenodeDesc(), e.getMessage(), e);
-          }
-          localTargetHAProtocol = null;
-        }
-      }
-    } catch(IOException e) {
+      // Try to get the HA status
+      updateHAStatusParameters(report);
+    } catch (IOException e) {
       LOG.error("Cannot communicate with {}: {}",
           getNamenodeDesc(), e.getMessage());
-    } catch(Throwable e) {
+    } catch (Throwable e) {
       // Generic error that we don't know about
       LOG.error("Unexpected exception while communicating with {}: {}",
           getNamenodeDesc(), e.getMessage(), e);
@@ -399,6 +378,59 @@ private static String getNnHeartBeatServiceName(String nsId, String nnId) {
         (nnId == null ? "" : " " + nnId);
   }
 
+  /**
+   * Get the namespace information for a Namenode via RPC and add them to the report.
+   * @param serviceURI Server address of the Namenode to monitor.
+   * @param report Namenode status report updating with namespace information data.
+   * @throws IOException This method will throw IOException up, because RBF need
+   *                     use Namespace Info to identify this NS. If there are some IOExceptions,
+   *                     RBF doesn't need to get other information from NameNode,
+   *                     so throw IOException up.
+   */
+  private void updateNameSpaceInfoParameters(URI serviceURI,
+      NamenodeStatusReport report) throws IOException {
+    try {
+      if (this.namenodeProtocol == null) {
+        this.namenodeProtocol = NameNodeProxies.createProxy(this.conf, serviceURI,
+            NamenodeProtocol.class).getProxy();
+      }
+      if (namenodeProtocol != null) {
+        NamespaceInfo info = namenodeProtocol.versionRequest();
+        if (info != null) {
+          report.setNamespaceInfo(info);
+        }
+      }
+    } catch (IOException e) {
+      this.namenodeProtocol = null;
+      throw e;
+    }
+  }
+
+  /**
+   * Get the safemode information for a Namenode via RPC and add them to the report.
+   * Safemode is only one status of NameNode and is useless for RBF identify one NameNode.
+   * So If there are some IOExceptions, RBF can just ignore it and try to collect
+   * other information form namenode continue.
+   * @param serviceURI Server address of the Namenode to monitor.
+   * @param report Namenode status report updating with safemode information data.
+   */
+  private void updateSafeModeParameters(URI serviceURI, NamenodeStatusReport report) {
+    try {
+      if (this.clientProtocol == null) {
+        this.clientProtocol = NameNodeProxies
+            .createProxy(this.conf, serviceURI, ClientProtocol.class)
+            .getProxy();
+      }
+      if (clientProtocol != null) {
+        boolean isSafeMode = clientProtocol.setSafeMode(SafeModeAction.SAFEMODE_GET, false);
+        report.setSafeMode(isSafeMode);
+      }
+    } catch (Exception e) {
+      LOG.error("Cannot fetch safemode state for {}", getNamenodeDesc(), e);
+      this.clientProtocol = null;
+    }
+  }
+
   /**
    * Get the parameters for a Namenode from JMX and add them to the report.
    * @param address Web interface of the Namenode to monitor.
@@ -415,6 +447,34 @@ private void updateJMXParameters(
     }
   }
 
+  /**
+   * Get the HA status for a Namenode via RPC and add them to the report.
+   * @param report Namenode status report updating with HA status information data.
+   */
+  private void updateHAStatusParameters(NamenodeStatusReport report) {
+    if (localTarget != null) {
+      try {
+        // Determine if NN is active
+        if (localTargetHAProtocol == null) {
+          localTargetHAProtocol = localTarget.getHealthMonitorProxy(
+              conf, this.healthMonitorTimeoutMs);
+          LOG.debug("Get HA status with address {}", lifelineAddress);
+        }
+        HAServiceStatus status = localTargetHAProtocol.getServiceStatus();
+        report.setHAServiceState(status.getState());
+      } catch (Throwable e) {
+        if (e.getMessage().startsWith("HA for namenode is not enabled")) {
+          LOG.error("HA for {} is not enabled", getNamenodeDesc());
+          localTarget = null;
+        } else {
+          // Failed to fetch HA status, ignoring failure
+          LOG.error("Cannot fetch HA status for {}", getNamenodeDesc(), e);
+        }
+        localTargetHAProtocol = null;
+      }
+    }
+  }
+
   /**
    * Fetches NamenodeInfo metrics from namenode.
    * @param address Web interface of the Namenode to monitor.

hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RBFConfigKeys.java

@@ -96,6 +96,10 @@ public class RBFConfigKeys extends CommonConfigurationKeysPublic {
       FEDERATION_ROUTER_PREFIX + "heartbeat.interval";
   public static final long DFS_ROUTER_HEARTBEAT_INTERVAL_MS_DEFAULT =
       TimeUnit.SECONDS.toMillis(5);
+  public static final String DFS_ROUTER_HEALTH_MONITOR_TIMEOUT =
+      FEDERATION_ROUTER_PREFIX + "health.monitor.timeout";
+  public static final long DFS_ROUTER_HEALTH_MONITOR_TIMEOUT_DEFAULT =
+      TimeUnit.SECONDS.toMillis(30);
   public static final String DFS_ROUTER_MONITOR_NAMENODE =
       FEDERATION_ROUTER_PREFIX + "monitor.namenode";
   public static final String DFS_ROUTER_MONITOR_NAMENODE_RESOLUTION_ENABLED =

hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/resources/hdfs-rbf-default.xml

@@ -385,6 +385,14 @@
     </description>
   </property>
 
+  <property>
+    <name>dfs.federation.router.health.monitor.timeout</name>
+    <value>30s</value>
+    <description>
+      Time out for Router to obtain HAServiceStatus from NameNode.
+    </description>
+  </property>
+
   <property>
     <name>dfs.federation.router.heartbeat-state.interval</name>
     <value>5s</value>