/** Initialize SecondaryNameNode. */ private void initialize(Configuration conf) throws IOException { // initiate Java VM metrics JvmMetrics.init("SecondaryNameNode", conf.get("session.id")); // Create connection to the namenode. shouldRun = true; nameNodeAddr = NameNode.getAddress(conf); this.conf = conf; this.namenode = (NamenodeProtocol) RPC.waitForProxy( NamenodeProtocol.class, NamenodeProtocol.versionID, nameNodeAddr, conf); // initialize checkpoint directories fsName = getInfoServer(); checkpointDirs = FSImage.getCheckpointDirs(conf, "/tmp/hadoop/dfs/namesecondary"); checkpointEditsDirs = FSImage.getCheckpointEditsDirs(conf, "/tmp/hadoop/dfs/namesecondary"); checkpointImage = new CheckpointStorage(conf); checkpointImage.recoverCreate(checkpointDirs, checkpointEditsDirs); // Initialize other scheduling parameters from the configuration checkpointPeriod = conf.getLong("fs.checkpoint.period", 3600); checkpointSize = conf.getLong("fs.checkpoint.size", 4194304); // initialize the webserver for uploading files. String infoAddr = NetUtils.getServerAddress( conf, "dfs.secondary.info.bindAddress", "dfs.secondary.info.port", "dfs.secondary.http.address"); InetSocketAddress infoSocAddr = NetUtils.createSocketAddr(infoAddr); infoBindAddress = infoSocAddr.getHostName(); int tmpInfoPort = infoSocAddr.getPort(); infoServer = new HttpServer("secondary", infoBindAddress, tmpInfoPort, tmpInfoPort == 0, conf); infoServer.setAttribute("name.system.image", checkpointImage); this.infoServer.setAttribute("name.conf", conf); infoServer.addInternalServlet("getimage", "/getimage", GetImageServlet.class); infoServer.start(); // The web-server port can be ephemeral... ensure we have the correct info infoPort = infoServer.getPort(); conf.set("dfs.secondary.http.address", infoBindAddress + ":" + infoPort); LOG.info("Secondary Web-server up at: " + infoBindAddress + ":" + infoPort); LOG.warn( "Checkpoint Period :" + checkpointPeriod + " secs " + "(" + checkpointPeriod / 60 + " min)"); LOG.warn( "Log Size Trigger :" + checkpointSize + " bytes " + "(" + checkpointSize / 1024 + " KB)"); }
/** Merge image and edits, and verify consistency with the signature. */ private void doMerge(CheckpointSignature sig, boolean loadImage) throws IOException { getEditLog().open(); StorageDirectory sdName = null; StorageDirectory sdEdits = null; Iterator<StorageDirectory> it = null; if (loadImage) { it = dirIterator(NameNodeDirType.IMAGE); if (it.hasNext()) sdName = it.next(); if (sdName == null) throw new IOException("Could not locate checkpoint fsimage"); } it = dirIterator(NameNodeDirType.EDITS); if (it.hasNext()) sdEdits = it.next(); if (sdEdits == null) throw new IOException("Could not locate checkpoint edits"); if (loadImage) { loadFSImage(FSImage.getImageFile(sdName, NameNodeFile.IMAGE)); } loadFSEdits(sdEdits); sig.validateStorageInfo(this); saveNamespace(false); }