com.splout.db.hadoop.StoreDeployerTool.java Source code

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Here is the source code for com.splout.db.hadoop.StoreDeployerTool.java

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package com.splout.db.hadoop;

/*
 * #%L
 * Splout SQL Hadoop library
 * %%
 * Copyright (C) 2012 Datasalt Systems S.L.
 * %%
 * Licensed 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.
 * #L%
 */

import com.datasalt.pangool.utils.HadoopUtils;
import com.splout.db.common.JSONSerDe;
import com.splout.db.common.JSONSerDe.JSONSerDeException;
import com.splout.db.common.PartitionMap;
import com.splout.db.common.ReplicationMap;
import com.splout.db.common.SploutClient;
import com.splout.db.engine.DefaultEngine;
import com.splout.db.qnode.beans.DeployInfo;
import com.splout.db.qnode.beans.DeployRequest;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

/**
 * A generic class for deploying an already generated store by {@link TablespaceGenerator}.
 */
public class StoreDeployerTool {

    private final static Log log = LogFactory.getLog(StoreDeployerTool.class);

    private String qnode;
    private Configuration conf;

    public StoreDeployerTool(String qnode, Configuration conf) {
        this.qnode = qnode;
        this.conf = conf;
    }

    /**
     * Deploy already generated tablespaces at a time.
     */
    @SuppressWarnings("unchecked")
    public void deploy(Collection<TablespaceDepSpec> deployments) throws JSONSerDeException, IOException {

        // We now query for the alive DNodes and build deployRequests accordingly
        DeployRequest[] deployRequests = new DeployRequest[deployments.size()];

        log.info("Querying Splout QNode for list of DNodes...");
        SploutClient client = new SploutClient(qnode);
        List<String> dnodes = client.dNodeList();
        if (dnodes == null || dnodes.size() == 0) {
            throw new IOException("No available DNodes in Splout cluster.");
        }

        int tIndex = 0;
        for (TablespaceDepSpec tablespace : deployments) {
            Path tablespaceOut = new Path(tablespace.getSourcePath());

            // Define a DeployRequest for this Tablespace
            deployRequests[tIndex] = new DeployRequest();

            // Splout only accepts absolute URIs
            FileSystem sourceFs = tablespaceOut.getFileSystem(conf);
            if (!sourceFs.exists(tablespaceOut)) {
                throw new IllegalArgumentException("Folder doesn't exist: " + tablespaceOut);
            }
            @SuppressWarnings("deprecation")
            Path absoluteOutPath = tablespaceOut.makeQualified(sourceFs);

            Path partitionMapPath = new Path(tablespaceOut, TablespaceGenerator.OUT_PARTITION_MAP);
            if (!sourceFs.exists(partitionMapPath)) {
                throw new IllegalArgumentException(
                        "Invalid tablespace folder: " + tablespaceOut + " doesn't contain a partition-map file.");
            }

            // Load the partition map
            PartitionMap partitionMap = JSONSerDe.deSer(HadoopUtils.fileToString(sourceFs, partitionMapPath),
                    PartitionMap.class);

            // Load the init statements, if they exist
            ArrayList<String> initStatements = new ArrayList<String>();
            Path initStatementsPath = new Path(tablespaceOut, TablespaceGenerator.OUT_INIT_STATEMENTS);
            if (sourceFs.exists(initStatementsPath)) {
                initStatements.addAll(
                        JSONSerDe.deSer(HadoopUtils.fileToString(sourceFs, initStatementsPath), ArrayList.class));
            }
            // Add the other initStatements coming in the deploy request
            if (tablespace.getInitStatements() != null) {
                initStatements.addAll(tablespace.getInitStatements());
            }

            String engine = DefaultEngine.class.getName();
            // New : load the engine id used in the generation tool, if exists ( to maintain backwards compatibility )
            Path engineId = new Path(tablespaceOut, TablespaceGenerator.OUT_ENGINE);
            if (sourceFs.exists(engineId)) {
                engine = HadoopUtils.fileToString(sourceFs, engineId);
                log.info("Using generated engine id: " + engine);
            }

            // Finally set
            deployRequests[tIndex].setInitStatements(initStatements);
            deployRequests[tIndex].setEngine(engine);

            deployRequests[tIndex].setTablespace(tablespace.getTablespace());
            deployRequests[tIndex].setData_uri(new Path(absoluteOutPath, "store").toUri().toString());
            deployRequests[tIndex].setPartitionMap(partitionMap.getPartitionEntries());

            // If rep > dnodes, impossible to reach this level of replication
            int repFactor = tablespace.getReplication();
            if (dnodes.size() < repFactor) {
                log.warn(
                        "WARNING: Replication factor " + repFactor + " for tablespace " + tablespace.getTablespace()
                                + " is bigger than the number of serving DNodes. Adjusting replication factor to "
                                + dnodes.size());
                repFactor = dnodes.size();
            }

            deployRequests[tIndex]
                    .setReplicationMap(ReplicationMap.roundRobinMap(partitionMap.getPartitionEntries().size(),
                            repFactor, dnodes.toArray(new String[0])).getReplicationEntries());

            tIndex++;
        }

        // Finally we send the deploy request
        DeployInfo dInfo = client.deploy(deployRequests);

        log.info("Deploy request of [" + deployments.size() + "] tablespaces performed. Deploy on [" + qnode
                + "] with version [" + dInfo.getVersion() + "] in progress.");
    }

}