org.apache.zeppelin.interpreter.recovery.FileSystemRecoveryStorage.java Source code

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Here is the source code for org.apache.zeppelin.interpreter.recovery.FileSystemRecoveryStorage.java

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/*
 * 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.zeppelin.interpreter.recovery;

import org.apache.commons.lang.StringUtils;
import org.apache.hadoop.fs.Path;
import org.apache.zeppelin.conf.ZeppelinConfiguration;
import org.apache.zeppelin.interpreter.InterpreterSetting;
import org.apache.zeppelin.interpreter.InterpreterSettingManager;
import org.apache.zeppelin.interpreter.ManagedInterpreterGroup;
import org.apache.zeppelin.interpreter.launcher.InterpreterClient;
import org.apache.zeppelin.interpreter.remote.RemoteInterpreterProcess;
import org.apache.zeppelin.interpreter.remote.RemoteInterpreterRunningProcess;
import org.apache.zeppelin.notebook.FileSystemStorage;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Hadoop compatible FileSystem based RecoveryStorage implementation.
 *
 * Save InterpreterProcess in the format of:
 * InterpreterGroupId host:port
 */
public class FileSystemRecoveryStorage extends RecoveryStorage {

    private static final Logger LOGGER = LoggerFactory.getLogger(FileSystemRecoveryStorage.class);

    private InterpreterSettingManager interpreterSettingManager;
    private FileSystemStorage fs;
    private Path recoveryDir;

    public FileSystemRecoveryStorage(ZeppelinConfiguration zConf,
            InterpreterSettingManager interpreterSettingManager) throws IOException {
        super(zConf);
        this.interpreterSettingManager = interpreterSettingManager;
        this.zConf = zConf;
        this.fs = new FileSystemStorage(zConf, zConf.getRecoveryDir());
        LOGGER.info("Creating FileSystem: " + this.fs.getFs().getClass().getName() + " for Zeppelin Recovery.");
        this.recoveryDir = this.fs.makeQualified(new Path(zConf.getRecoveryDir()));
        LOGGER.info("Using folder {} to store recovery data", recoveryDir);
        this.fs.tryMkDir(recoveryDir);
    }

    @Override
    public void onInterpreterClientStart(InterpreterClient client) throws IOException {
        save(client.getInterpreterSettingName());
    }

    @Override
    public void onInterpreterClientStop(InterpreterClient client) throws IOException {
        save(client.getInterpreterSettingName());
    }

    private void save(String interpreterSettingName) throws IOException {
        InterpreterSetting interpreterSetting = interpreterSettingManager
                .getInterpreterSettingByName(interpreterSettingName);
        List<String> recoveryContent = new ArrayList<>();
        for (ManagedInterpreterGroup interpreterGroup : interpreterSetting.getAllInterpreterGroups()) {
            RemoteInterpreterProcess interpreterProcess = interpreterGroup.getInterpreterProcess();
            if (interpreterProcess != null) {
                recoveryContent.add(interpreterGroup.getId() + "\t" + interpreterProcess.getHost() + ":"
                        + interpreterProcess.getPort());
            }
        }
        LOGGER.debug("Updating recovery data for interpreterSetting: " + interpreterSettingName);
        LOGGER.debug("Recovery Data: " + StringUtils.join(recoveryContent, System.lineSeparator()));
        Path recoveryFile = new Path(recoveryDir, interpreterSettingName + ".recovery");
        fs.writeFile(StringUtils.join(recoveryContent, System.lineSeparator()), recoveryFile, true);
    }

    @Override
    public Map<String, InterpreterClient> restore() throws IOException {
        Map<String, InterpreterClient> clients = new HashMap<>();
        List<Path> paths = fs.list(new Path(recoveryDir + "/*.recovery"));

        for (Path path : paths) {
            String fileName = path.getName();
            String interpreterSettingName = fileName.substring(0, fileName.length() - ".recovery".length());
            String recoveryContent = fs.readFile(path);
            if (!StringUtils.isBlank(recoveryContent)) {
                for (String line : recoveryContent.split(System.lineSeparator())) {
                    String[] tokens = line.split("\t");
                    String groupId = tokens[0];
                    String[] hostPort = tokens[1].split(":");
                    int connectTimeout = zConf
                            .getInt(ZeppelinConfiguration.ConfVars.ZEPPELIN_INTERPRETER_CONNECT_TIMEOUT);
                    RemoteInterpreterRunningProcess client = new RemoteInterpreterRunningProcess(
                            interpreterSettingName, connectTimeout, hostPort[0], Integer.parseInt(hostPort[1]));
                    // interpreterSettingManager may be null when this class is used when it is used
                    // stop-interpreter.sh
                    clients.put(groupId, client);
                    LOGGER.info("Recovering Interpreter Process: " + hostPort[0] + ":" + hostPort[1]);
                }
            }
        }

        return clients;
    }
}