/* This file is part of VoltDB.
* Copyright (C) 2008-2014 VoltDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with VoltDB. If not, see <http://www.gnu.org/licenses/>.
*/
package org.voltdb.rejoin;
import org.apache.zookeeper_voltpatches.KeeperException;
import org.json_voltpatches.JSONException;
import org.json_voltpatches.JSONObject;
import org.json_voltpatches.JSONStringer;
import org.voltcore.messaging.HostMessenger;
import org.voltdb.VoltDB;
import org.voltdb.catalog.Database;
import org.voltdb.messaging.LocalMailbox;
import org.voltdb.sysprocs.saverestore.SnapshotRequestConfig;
import org.voltdb.utils.VoltFile;
import java.io.File;
import java.util.Map;
import java.util.concurrent.ExecutionException;
/**
* Coordinates the sites to perform rejoin
*/
public abstract class JoinCoordinator extends LocalMailbox {
protected final HostMessenger m_messenger;
public JoinCoordinator(HostMessenger hostMessenger) {
super(hostMessenger, hostMessenger.generateMailboxId(null));
m_messenger = hostMessenger;
}
public void initialize(int kfactor)
throws JSONException, KeeperException, InterruptedException, ExecutionException {}
public void setPartitionsToHSIds(Map<Integer, Long> partsToHSIds) {}
public JSONObject getTopology() {
throw new UnsupportedOperationException("getTopology is only supported for elastic join");
}
/**
* Starts the rejoin process.
*/
public abstract boolean startJoin(Database catalog);
/**
* Discard the mailbox.
*/
public void close() {
m_messenger.removeMailbox(getHSId());
}
protected static void clearOverflowDir(String voltroot)
{
// clear overflow dir in case there are files left from previous runs
try {
File overflowDir = new File(voltroot, "join_overflow");
if (overflowDir.exists()) {
VoltFile.recursivelyDelete(overflowDir);
}
} catch (Exception e) {
VoltDB.crashLocalVoltDB("Fail to clear join overflow directory", false, e);
}
}
public static String makeSnapshotNonce(String type, long HSId)
{
return type + "_" + HSId + "_" + System.currentTimeMillis();
}
public static String makeSnapshotRequest(SnapshotRequestConfig config)
{
try {
JSONStringer jsStringer = new JSONStringer();
jsStringer.object();
config.toJSONString(jsStringer);
jsStringer.endObject();
return jsStringer.toString();
} catch (Exception e) {
VoltDB.crashLocalVoltDB("Failed to serialize to JSON", true, e);
}
// unreachable;
return null;
}
}