hadoop RouterFsck 源码

haddop RouterFsck 代码

文件路径：/hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterFsck.java

/**
 * 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.server.federation.router;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.URL;
import java.net.URLConnection;
import java.nio.charset.StandardCharsets;
import java.util.Collections;
import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.hdfs.server.federation.resolver.FederationNamenodeServiceState;
import org.apache.hadoop.hdfs.server.federation.store.MembershipStore;
import org.apache.hadoop.hdfs.server.federation.store.StateStoreService;
import org.apache.hadoop.hdfs.server.federation.store.protocol.GetNamenodeRegistrationsRequest;
import org.apache.hadoop.hdfs.server.federation.store.protocol.GetNamenodeRegistrationsResponse;
import org.apache.hadoop.hdfs.server.federation.store.records.MembershipState;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.util.Time;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Wrapper for the Router to offer the Namenode FSCK.
 */
@InterfaceAudience.Private
@InterfaceStability.Unstable
public class RouterFsck {

  public static final Logger LOG =
      LoggerFactory.getLogger(RouterFsck.class.getName());

  private final Router router;
  private final InetAddress remoteAddress;
  private final PrintWriter out;
  private final Map<String, String[]> pmap;

  public RouterFsck(Router router, Map<String, String[]> pmap,
                    PrintWriter out, InetAddress remoteAddress) {
    this.router = router;
    this.remoteAddress = remoteAddress;
    this.out = out;
    this.pmap = pmap;
  }

  public void fsck() {
    final long startTime = Time.monotonicNow();
    try {
      String warnMsg = "Now FSCK to DFSRouter is unstable feature. " +
          "There may be incompatible changes between releases.";
      LOG.warn(warnMsg);
      out.println(warnMsg);
      String msg = "Federated FSCK started by " +
          UserGroupInformation.getCurrentUser() + " from " + remoteAddress +
          " at " + new Date();
      LOG.info(msg);
      out.println(msg);

      // Check each Namenode in the federation
      StateStoreService stateStore = router.getStateStore();
      MembershipStore membership =
          stateStore.getRegisteredRecordStore(MembershipStore.class);
      GetNamenodeRegistrationsRequest request =
          GetNamenodeRegistrationsRequest.newInstance();
      GetNamenodeRegistrationsResponse response =
          membership.getNamenodeRegistrations(request);
      List<MembershipState> memberships = response.getNamenodeMemberships();
      Collections.sort(memberships);
      for (MembershipState nn : memberships) {
        if (nn.getState() == FederationNamenodeServiceState.ACTIVE) {
          try {
            String webAddress = nn.getWebAddress();
            out.write("Checking " + nn + " at " + webAddress + "\n");
            remoteFsck(nn);
          } catch (IOException ioe) {
            out.println("Cannot query " + nn + ": " + ioe.getMessage() + "\n");
          }
        }
      }

      out.println("Federated FSCK ended at " + new Date() + " in "
          + (Time.monotonicNow() - startTime + " milliseconds"));
    } catch (Exception e) {
      String errMsg = "Fsck " + e.getMessage();
      LOG.warn(errMsg, e);
      out.println("Federated FSCK ended at " + new Date() + " in "
          + (Time.monotonicNow() - startTime + " milliseconds"));
      out.println(e.getMessage());
      out.print("\n\n" + errMsg);
    } finally {
      out.close();
    }
  }

  /**
   * Perform FSCK in a remote Namenode.
   *
   * @param nn The state of the remote NameNode
   * @throws IOException Failed to fsck in a remote NameNode
   */
  private void remoteFsck(MembershipState nn) throws IOException {
    final String scheme = nn.getWebScheme();
    final String webAddress = nn.getWebAddress();
    final String args = getURLArguments(pmap);
    final URL url = new URL(scheme + "://" + webAddress + "/fsck?" + args);

    // Connect to the Namenode and output
    final URLConnection conn = url.openConnection();
    try (InputStream is = conn.getInputStream();
         InputStreamReader isr =
             new InputStreamReader(is, StandardCharsets.UTF_8);
         BufferedReader br = new BufferedReader(isr)) {
      String line;
      while ((line = br.readLine()) != null) {
        out.write(line + "\n");
      }
    }
  }

  /**
   * Get the URL arguments from the query.
   *
   * @param map Original map of arguments.
   * @return Arguments ready to be attached to the URL.
   */
  private static String getURLArguments(Map<String, String[]> map) {
    StringBuilder sb = new StringBuilder();
    for (Entry<String, String[]> entry : map.entrySet()) {
      String key = entry.getKey();
      String[] value = entry.getValue();
      if (sb.length() > 0) {
        sb.append("&");
      }
      sb.append(key);
      sb.append("=");
      sb.append(value[0]);
    }
    return sb.toString();
  }
}

相关信息

hadoop 源码目录

相关文章

hadoop ConnectionContext 源码

hadoop ConnectionManager 源码

hadoop ConnectionNullException 源码

hadoop ConnectionPool 源码

hadoop ConnectionPoolId 源码

hadoop DFSRouter 源码

hadoop ErasureCoding 源码

hadoop FederationConnectionId 源码

hadoop FederationUtil 源码

hadoop IsRouterActiveServlet 源码