/* This file is part of VoltDB.
* Copyright (C) 2008-2017 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.iv2;
import java.util.List;
import java.util.concurrent.CancellationException;
import java.util.concurrent.ExecutionException;
import org.apache.zookeeper_voltpatches.KeeperException;
import org.apache.zookeeper_voltpatches.ZooKeeper;
import org.voltcore.messaging.HostMessenger;
import org.voltcore.zk.LeaderElector;
import org.voltdb.BackendTarget;
import org.voltdb.CatalogContext;
import org.voltdb.CatalogSpecificPlanner;
import org.voltdb.CommandLog;
import org.voltdb.MemoryStats;
import org.voltdb.ProducerDRGateway;
import org.voltdb.Promotable;
import org.voltdb.StartAction;
import org.voltdb.StatsAgent;
import org.voltdb.VoltDB;
import org.voltdb.VoltZK;
import org.voltdb.iv2.RepairAlgo.RepairResult;
import org.voltdb.messaging.DumpMessage;
import org.voltdb.messaging.Iv2InitiateTaskMessage;
/**
* Subclass of Initiator to manage multi-partition operations.
* This class is primarily used for object construction and configuration plumbing;
* Try to avoid filling it with lots of other functionality.
*/
public class MpInitiator extends BaseInitiator implements Promotable
{
public static final int MP_INIT_PID = TxnEgo.PARTITIONID_MAX_VALUE;
public MpInitiator(HostMessenger messenger, List<Long> buddyHSIds, StatsAgent agent)
{
super(VoltZK.iv2mpi,
messenger,
MP_INIT_PID,
new MpScheduler(
MP_INIT_PID,
buddyHSIds,
new SiteTaskerQueue()),
"MP",
agent,
StartAction.CREATE /* never for rejoin */);
}
@Override
public void configure(BackendTarget backend,
CatalogContext catalogContext,
String serializedCatalog,
CatalogSpecificPlanner csp,
int numberOfPartitions,
StartAction startAction,
StatsAgent agent,
MemoryStats memStats,
CommandLog cl,
String coreBindIds,
boolean hasMPDRGateway)
throws KeeperException, InterruptedException, ExecutionException
{
// note the mp initiator always uses a non-ipc site, even though it's never used for anything
if ((backend == BackendTarget.NATIVE_EE_IPC) || (backend == BackendTarget.NATIVE_EE_VALGRIND_IPC)) {
backend = BackendTarget.NATIVE_EE_JNI;
}
super.configureCommon(backend, catalogContext, serializedCatalog,
csp, numberOfPartitions, startAction, null, null, cl, coreBindIds, false);
// Hacky
MpScheduler sched = (MpScheduler)m_scheduler;
MpRoSitePool sitePool = new MpRoSitePool(m_initiatorMailbox.getHSId(),
backend,
catalogContext,
m_partitionId,
m_initiatorMailbox,
csp);
sched.setMpRoSitePool(sitePool);
// add ourselves to the ephemeral node list which BabySitters will watch for this
// partition
LeaderElector.createParticipantNode(m_messenger.getZK(),
LeaderElector.electionDirForPartition(VoltZK.leaders_initiators, m_partitionId),
Long.toString(getInitiatorHSId()), null);
}
@Override
public void initDRGateway(StartAction startAction, ProducerDRGateway nodeDRGateway, boolean createMpDRGateway)
{
// No-op on MPI
}
@Override
public void acceptPromotion()
{
try {
long startTime = System.currentTimeMillis();
Boolean success = false;
m_term = createTerm(m_messenger.getZK(),
m_partitionId, getInitiatorHSId(), m_initiatorMailbox,
m_whoami);
m_term.start();
while (!success) {
final RepairAlgo repair =
m_initiatorMailbox.constructRepairAlgo(m_term.getInterestingHSIds(), m_whoami);
// term syslogs the start of leader promotion.
long txnid = Long.MIN_VALUE;
try {
RepairResult res = repair.start().get();
txnid = res.m_txnId;
success = true;
} catch (CancellationException e) {
success = false;
}
if (success) {
m_initiatorMailbox.setLeaderState(txnid);
List<Iv2InitiateTaskMessage> restartTxns = ((MpPromoteAlgo)repair).getInterruptedTxns();
if (!restartTxns.isEmpty()) {
// Should only be one restarting MP txn
if (restartTxns.size() > 1) {
tmLog.fatal("Detected a fatal condition while repairing multipartition transactions " +
"following a cluster topology change.");
tmLog.fatal("The MPI found multiple transactions requiring restart: ");
for (Iv2InitiateTaskMessage txn : restartTxns) {
tmLog.fatal("Restart candidate: " + txn);
}
tmLog.fatal("This node will fail. Please contact VoltDB support with your cluster's " +
"log files.");
m_initiatorMailbox.send(
com.google_voltpatches.common.primitives.Longs.toArray(m_term.getInterestingHSIds().get()),
new DumpMessage());
throw new RuntimeException("Failing promoted MPI node with unresolvable repair condition.");
}
tmLog.debug(m_whoami + " restarting MP transaction: " + restartTxns.get(0));
m_initiatorMailbox.repairReplicasWith(null, restartTxns.get(0));
}
tmLog.info(m_whoami
+ "finished leader promotion. Took "
+ (System.currentTimeMillis() - startTime) + " ms.");
// THIS IS where map cache should be updated, not
// in the promotion algorithm.
LeaderCacheWriter iv2masters = new LeaderCache(m_messenger.getZK(),
m_zkMailboxNode);
iv2masters.put(m_partitionId, m_initiatorMailbox.getHSId());
}
else {
// The only known reason to fail is a failed replica during
// recovery; that's a bounded event (by k-safety).
// CrashVoltDB here means one node failure causing another.
// Don't create a cascading failure - just try again.
tmLog.info(m_whoami
+ "interrupted during leader promotion after "
+ (System.currentTimeMillis() - startTime) + " ms. of "
+ "trying. Retrying.");
}
}
} catch (Exception e) {
VoltDB.crashLocalVoltDB("Terminally failed leader promotion.", true, e);
}
}
/**
* The MPInitiator does not have user data to rejoin.
*/
@Override
public boolean isRejoinable()
{
return false;
}
@Override
public Term createTerm(ZooKeeper zk, int partitionId, long initiatorHSId, InitiatorMailbox mailbox,
String whoami)
{
return new MpTerm(zk, initiatorHSId, mailbox, whoami);
}
/**
* Update the MPI's Site's catalog. Unlike the SPI, this is not going to
* run from the same Site's thread; this is actually going to run from some
* other local SPI's Site thread. Since the MPI's site thread is going to
* be blocked running the EveryPartitionTask for the catalog update, this
* is currently safe with no locking. And yes, I'm a horrible person.
*/
public void updateCatalog(String diffCmds, CatalogContext context, CatalogSpecificPlanner csp,
boolean requireCatalogDiffCmdsApplyToEE, boolean requiresNewExportGeneration)
{
// note this will never require snapshot isolation because the MPI has no snapshot funtionality
m_executionSite.updateCatalog(diffCmds, context, csp, false, true, Long.MIN_VALUE, Long.MIN_VALUE,
requireCatalogDiffCmdsApplyToEE, requiresNewExportGeneration);
MpScheduler sched = (MpScheduler)m_scheduler;
sched.updateCatalog(diffCmds, context, csp);
}
public void updateSettings(CatalogContext context, CatalogSpecificPlanner csp)
{
m_executionSite.updateSettings(context, csp);
MpScheduler sched = (MpScheduler)m_scheduler;
sched.updateSettings(context, csp);
}
@Override
public void enableWritingIv2FaultLog() {
m_initiatorMailbox.enableWritingIv2FaultLog();
}
}