| /** |
| * 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(); |
| } |
| } |