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/* This file is part of VoltDB.
* Copyright (C) 2008-2018 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 .
*/
package org.voltdb.iv2;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import org.voltcore.logging.VoltLogger;
import org.voltcore.messaging.Mailbox;
import org.voltcore.utils.CoreUtils;
import org.voltcore.utils.Pair;
import org.voltdb.DRConsumerDrIdTracker.DRSiteDrIdTracker;
import org.voltdb.SiteProcedureConnection;
import org.voltdb.SnapshotCompletionInterest.SnapshotCompletionEvent;
import org.voltdb.SnapshotSaveAPI;
import org.voltdb.VoltDB;
import org.voltdb.catalog.Database;
import org.voltdb.catalog.Table;
import org.voltdb.messaging.RejoinMessage;
import org.voltdb.messaging.RejoinMessage.Type;
import org.voltdb.rejoin.StreamSnapshotDataTarget;
import org.voltdb.rejoin.StreamSnapshotSink;
import org.voltdb.rejoin.StreamSnapshotSink.RestoreWork;
import org.voltdb.rejoin.TaskLog;
import org.voltdb.utils.CatalogUtil;
/**
* Manages the lifecycle of snapshot serialization to a site
* for the purposes of rejoin.
*/
public class RejoinProducer extends JoinProducerBase {
private static final VoltLogger REJOINLOG = new VoltLogger("REJOIN");
private final AtomicBoolean m_currentlyRejoining;
private static ScheduledFuture m_timeFuture;
private Mailbox m_streamSnapshotMb = null;
private StreamSnapshotSink m_rejoinSiteProcessor = null;
// Stores the name of the views to pause/resume during a rejoin stream snapshot restore process.
private String m_commaSeparatedNameOfViewsToPause = null;
// True if we're handling a table-less rejoin.
boolean m_schemaHasNoTables = false;
// Barrier that prevents the finish task for firing until all sites have finished the stream snapshot
private static AtomicInteger s_streamingSiteCount;
// Get the snapshot nonce from the RejoinCoordinator's INITIATION message.
// Then register the completion interest.
//
// When the completion interest callback fires for the nonce,
// capture the snapshot txnid and tell the replay agent the snapshot is
// complete and unregister the interest.
//
// The txnId informs post-rejoin replay where to start. TxnId
// is stored in a ReplayCompletionAction which also bundles
// the Replay complete logic; When the snapshot transfer is
// complete, the RejoinProducer will hand the ReplayCompletionAction
// to the Site which must take its own action to conclude rejoin and
// then run the ReplayCompleteAction.
//
// The rest of RejoinProducer is driven by the snapshot sink..
//
// When the first data sink block arrives, offer the
// producer to the SiteTaskerQueue.
//
// Blocking and nonblocking work the same now, the only difference
// is that in blocking the snapshot transaction blocks on streaming all data
//
// In both cases, the site is responding with REJOINING to
// all incoming tasks.
//
// Conditions to complete RejoinProducer and
// transition to the Site controlled portion of rejoin:
// 1. Snapshot must be fully transfered (sink EOF reached)
// 2. The snapshot completion monitor callback must have been
// triggered.
//
// The rejoin producer times out the snapshot block arrival.
// If a block does not arrive within 60s, the RejoinProducer
// terminates the current node. The watchdog timer is accessed
// from multiple threads
/**
* ReplayCompletionAction communicates the snapshot txn id to
* the site and offers a run() method that closes the open
* rejoin state with the rejoin coordinator once the site has
* concluded rejoin.
*/
public class ReplayCompletionAction extends JoinCompletionAction
{
@Override
public void run()
{
REJOINLOG.debug(m_whoami + "informing rejoinCoordinator "
+ CoreUtils.hsIdToString(m_coordinatorHsId)
+ " of REPLAY_FINISHED");
RejoinMessage replay_complete = new RejoinMessage(
m_mailbox.getHSId(), RejoinMessage.Type.REPLAY_FINISHED);
m_mailbox.send(m_coordinatorHsId, replay_complete);
m_currentlyRejoining.set(false);
SnapshotSaveAPI.recoveringSiteCount.decrementAndGet();
}
}
public static void initBarrier(int siteCount) {
s_streamingSiteCount = new AtomicInteger(siteCount);
}
// Run if the watchdog isn't cancelled within the timeout period
private static class TimerCallback implements Runnable
{
@Override
public void run()
{
VoltDB.crashLocalVoltDB(String.format(
"Rejoin process timed out due to no data sent from active nodes for %d seconds Terminating rejoin.",
StreamSnapshotDataTarget.DEFAULT_WRITE_TIMEOUT_MS / 1000),
false,
null);
}
}
// Only instantiated if it must be used. This is important because
// m_currentlyRejoining gates promotion to master. If the rejoin producer
// is instantiated, it must complete its execution and set currentlyRejoining
// to false.
public RejoinProducer(int partitionId, SiteTaskerQueue taskQueue)
{
super(partitionId, "Rejoin producer:" + partitionId + " ", taskQueue);
m_currentlyRejoining = new AtomicBoolean(true);
m_completionAction = new ReplayCompletionAction();
if (REJOINLOG.isDebugEnabled()) {
REJOINLOG.debug(m_whoami + "created.");
}
}
@Override
public boolean acceptPromotion()
{
return !m_currentlyRejoining.get();
}
@Override
public void deliver(RejoinMessage message)
{
if (message.getType() == RejoinMessage.Type.INITIATION
|| message.getType() == RejoinMessage.Type.INITIATION_COMMUNITY) {
doInitiation(message);
}
else {
VoltDB.crashLocalVoltDB(
"Unknown rejoin message type: " + message.getType(), false,
null);
}
}
@Override
public TaskLog constructTaskLog(String voltroot)
{
m_taskLog = initializeTaskLog(voltroot, m_partitionId);
return m_taskLog;
}
@Override
protected VoltLogger getLogger() {
return REJOINLOG;
}
// cancel and maybe rearm the node-global snapshot data-segment watchdog.
@Override
protected void kickWatchdog(boolean rearm)
{
synchronized (RejoinProducer.class) {
if (m_timeFuture != null) {
m_timeFuture.cancel(false);
m_timeFuture = null;
}
if (rearm) {
m_timeFuture = VoltDB.instance().scheduleWork(
new TimerCallback(),
StreamSnapshotDataTarget.DEFAULT_WRITE_TIMEOUT_MS,
0,
TimeUnit.MILLISECONDS);
}
}
}
/**
* Runs when the RejoinCoordinator decides this site should start
* rejoin.
*/
void doInitiation(RejoinMessage message)
{
m_coordinatorHsId = message.m_sourceHSId;
m_schemaHasNoTables = message.schemaHasNoTables();
if (!m_schemaHasNoTables) {
m_streamSnapshotMb = VoltDB.instance().getHostMessenger().createMailbox();
m_rejoinSiteProcessor = new StreamSnapshotSink(m_streamSnapshotMb);
}
else {
m_streamSnapshotMb = null;
m_rejoinSiteProcessor = null;
}
// MUST choose the leader as the source.
long sourceSite = m_mailbox.getMasterHsId(m_partitionId);
// The lowest partition has a single source for all messages whereas all other partitions have a real
// data source and a dummy data source for replicated tables that are used to sync up replicated table changes.
boolean haveTwoSources = VoltDB.instance().getLowestPartitionId() != m_partitionId;
// Provide a valid sink host id unless it is an empty database.
long hsId = (m_rejoinSiteProcessor != null
? m_rejoinSiteProcessor.initialize(haveTwoSources?2:1,
message.getSnapshotDataBufferPool(),
message.getSnapshotCompressedDataBufferPool())
: Long.MIN_VALUE);
REJOINLOG.debug(m_whoami
+ "received INITIATION message. Doing rejoin"
+ ". Source site is: "
+ CoreUtils.hsIdToString(sourceSite)
+ " and destination rejoin processor is: "
+ CoreUtils.hsIdToString(hsId)
+ " and snapshot nonce is: "
+ message.getSnapshotNonce());
registerSnapshotMonitor(message.getSnapshotNonce());
// Tell the RejoinCoordinator everything it will need to know to get us our snapshot stream.
RejoinMessage initResp = new RejoinMessage(m_mailbox.getHSId(), sourceSite, hsId);
m_mailbox.send(m_coordinatorHsId, initResp);
// Start waiting for snapshot data
m_taskQueue.offer(this);
}
/**
* SiteTasker run -- load this site!
*
* run() is invoked when the RejoinProducer (this) submits itself to the
* site tasker. RejoinProducer submits itself to the site tasker queue
* when rejoin data is available. Rejoin data is available after the
* snapshot request is fulfilled. The snapshot request is made by the rejoin
* coordinator on our behalf.
*/
@Override
public void run(SiteProcedureConnection siteConnection)
{
throw new RuntimeException(
"Unexpected execution of run method in rejoin producer.");
}
/**
* An implementation of run() that does not block the site thread.
* The Site has responsibility for transactions that occur between
* schedulings of this task.
*/
@Override
public void runForRejoin(SiteProcedureConnection siteConnection,
TaskLog m_taskLog) throws IOException
{
// After doInitialization(), the rejoin producer is inserted into the task queue,
// and then we come here repeatedly until the stream snapshot restore finishes.
// The first time when this producer method is run (m_commaSeparatedNameOfViewsToPause is null),
// we need to figure out which views to pause so that they are handled properly
// before the snapshot streams arrive.
if (m_commaSeparatedNameOfViewsToPause == null) {
// The very first execution of runForRejoin will lead us here.
StringBuilder commaSeparatedViewNames = new StringBuilder();
Database db = VoltDB.instance().getCatalogContext().database;
for (Table table : VoltDB.instance().getCatalogContext().tables) {
if (CatalogUtil.isSnapshotablePersistentTableView(db, table)) {
// If the table is a snapshotted persistent table view, we will try to
// temporarily disable its maintenance job to boost restore performance.
commaSeparatedViewNames.append(table.getTypeName()).append(",");
}
}
// Get rid of the trailing comma.
if (commaSeparatedViewNames.length() > 0) {
commaSeparatedViewNames.setLength(commaSeparatedViewNames.length() - 1);
}
m_commaSeparatedNameOfViewsToPause = commaSeparatedViewNames.toString();
// Set enabled to false for the views we found.
siteConnection.setViewsEnabled(m_commaSeparatedNameOfViewsToPause, false);
}
if (!m_schemaHasNoTables) {
boolean sourcesReady = false;
RestoreWork rejoinWork = m_rejoinSiteProcessor.poll(m_snapshotBufferAllocator);
if (rejoinWork != null) {
restoreBlock(rejoinWork, siteConnection);
sourcesReady = true;
}
if (m_rejoinSiteProcessor.isEOF() == false) {
returnToTaskQueue(sourcesReady);
} else {
REJOINLOG.debug(m_whoami + "Rejoin snapshot transfer is finished");
m_rejoinSiteProcessor.close();
boolean allSitesFinishStreaming;
if (m_streamSnapshotMb != null) {
VoltDB.instance().getHostMessenger().removeMailbox(m_streamSnapshotMb.getHSId());
m_streamSnapshotMb = null;
allSitesFinishStreaming = s_streamingSiteCount.decrementAndGet() == 0;
}
else {
int pendingSites = s_streamingSiteCount.get();
assert(pendingSites >= 0);
allSitesFinishStreaming = pendingSites == 0;
}
if (allSitesFinishStreaming) {
doFinishingTask(siteConnection);
}
else {
returnToTaskQueue(sourcesReady);
}
}
}
else {
doFinishingTask(siteConnection);
// Remove the completion monitor for an empty (zero table) rejoin.
m_snapshotCompletionMonitor.set(null);
}
}
private void doFinishingTask(final SiteProcedureConnection siteConnection) {
/*
* Don't notify the rejoin coordinator yet. The stream snapshot may
* have not finished on all nodes, let the snapshot completion
* monitor tell the rejoin coordinator.
*
* This used to block on the completion interest, but this raced
* with fragments from the MPI that needed dummy responses. If the fragments
* came after the EOF then they wouldn't receive dummy responses
* and then the MPI wouldn't invoke SnapshotSaveAPI.logParticipatingHostCount
*/
final SiteTasker finishingTask = new SiteTasker() {
@Override
public void run(SiteProcedureConnection siteConnection) {
throw new RuntimeException(
"Unexpected execution of run method in rejoin producer.");
}
@Override
public void runForRejoin(SiteProcedureConnection siteConnection, TaskLog rejoinTaskLog) throws IOException {
if (!m_snapshotCompletionMonitor.isDone()) {
m_taskQueue.offer(this);
return;
}
assert(m_commaSeparatedNameOfViewsToPause != null);
// Resume the views.
siteConnection.setViewsEnabled(m_commaSeparatedNameOfViewsToPause, true);
SnapshotCompletionEvent event = null;
Map>> exportSequenceNumbers = null;
Map drSequenceNumbers = null;
Map>> allConsumerSiteTrackers = null;
long clusterCreateTime = -1;
try {
event = m_snapshotCompletionMonitor.get();
if (!m_schemaHasNoTables) {
REJOINLOG.debug(m_whoami + "waiting on snapshot completion monitor.");
exportSequenceNumbers = event.exportSequenceNumbers;
m_completionAction.setSnapshotTxnId(event.multipartTxnId);
drSequenceNumbers = event.drSequenceNumbers;
allConsumerSiteTrackers = event.drMixedClusterSizeConsumerState;
clusterCreateTime = event.clusterCreateTime;
// Tells EE which DR version going to use
siteConnection.setDRProtocolVersion(event.drVersion);
}
REJOINLOG.debug(m_whoami + " monitor completed. Sending SNAPSHOT_FINISHED "
+ "and handing off to site.");
RejoinMessage snap_complete = new RejoinMessage(
m_mailbox.getHSId(), Type.SNAPSHOT_FINISHED);
m_mailbox.send(m_coordinatorHsId, snap_complete);
} catch (InterruptedException crashme) {
VoltDB.crashLocalVoltDB(
"Interrupted awaiting snapshot completion.", true, crashme);
} catch (ExecutionException e) {
VoltDB.crashLocalVoltDB(
"Unexpected exception awaiting snapshot completion.", true,
e);
}
if (exportSequenceNumbers == null) {
// Send empty sequence number map if the schema is empty (no tables).
exportSequenceNumbers = new HashMap>>();
}
setJoinComplete(
siteConnection,
exportSequenceNumbers,
drSequenceNumbers,
allConsumerSiteTrackers,
m_schemaHasNoTables == false /* requireExistingSequenceNumbers */,
clusterCreateTime);
}
};
try {
finishingTask.runForRejoin(siteConnection, null);
} catch (IOException e) {
VoltDB.crashLocalVoltDB("Unexpected IOException in rejoin", true, e);
}
}
}
