org.apache.cassandra.service.ActiveRepairService Maven / Gradle / Ivy
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* distributed with this work for additional information
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* 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,
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* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.cassandra.service;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.*;
import java.util.concurrent.*;
import com.google.common.collect.Multimap;
import com.google.common.collect.Sets;
import org.apache.cassandra.concurrent.JMXConfigurableThreadPoolExecutor;
import org.apache.cassandra.concurrent.NamedThreadFactory;
import org.apache.cassandra.config.DatabaseDescriptor;
import org.apache.cassandra.dht.Range;
import org.apache.cassandra.dht.Token;
import org.apache.cassandra.gms.FailureDetector;
import org.apache.cassandra.gms.Gossiper;
import org.apache.cassandra.locator.TokenMetadata;
import org.apache.cassandra.repair.*;
import org.apache.cassandra.repair.messages.RepairMessage;
import org.apache.cassandra.repair.messages.SyncComplete;
import org.apache.cassandra.repair.messages.ValidationComplete;
import org.apache.cassandra.utils.FBUtilities;
/**
* ActiveRepairService is the starting point for manual "active" repairs.
*
* Each user triggered repair will correspond to one or multiple repair session,
* one for each token range to repair. On repair session might repair multiple
* column families. For each of those column families, the repair session will
* request merkle trees for each replica of the range being repaired, diff those
* trees upon receiving them, schedule the streaming ofthe parts to repair (based on
* the tree diffs) and wait for all those operation. See RepairSession for more
* details.
*
* The creation of a repair session is done through the submitRepairSession that
* returns a future on the completion of that session.
*/
public class ActiveRepairService
{
// singleton enforcement
public static final ActiveRepairService instance = new ActiveRepairService();
private static final ThreadPoolExecutor executor;
static
{
executor = new JMXConfigurableThreadPoolExecutor(4,
60,
TimeUnit.SECONDS,
new LinkedBlockingQueue(),
new NamedThreadFactory("AntiEntropySessions"),
"internal");
}
public static enum Status
{
STARTED, SESSION_SUCCESS, SESSION_FAILED, FINISHED
}
/**
* A map of active session.
*/
private final ConcurrentMap sessions;
/**
* Protected constructor. Use ActiveRepairService.instance.
*/
protected ActiveRepairService()
{
sessions = new ConcurrentHashMap<>();
}
/**
* Requests repairs for the given keyspace and column families.
*
* @return Future for asynchronous call or null if there is no need to repair
*/
public RepairFuture submitRepairSession(Range range, String keyspace, boolean isSequential, Collection dataCenters, Collection hosts, String... cfnames)
{
RepairSession session = new RepairSession(range, keyspace, isSequential, dataCenters, hosts, cfnames);
if (session.endpoints.isEmpty())
return null;
RepairFuture futureTask = new RepairFuture(session);
executor.execute(futureTask);
return futureTask;
}
public void addToActiveSessions(RepairSession session)
{
sessions.put(session.getId(), session);
Gossiper.instance.register(session);
FailureDetector.instance.registerFailureDetectionEventListener(session);
}
public void removeFromActiveSessions(RepairSession session)
{
FailureDetector.instance.unregisterFailureDetectionEventListener(session);
Gossiper.instance.unregister(session);
sessions.remove(session.getId());
}
public void terminateSessions()
{
for (RepairSession session : sessions.values())
{
session.forceShutdown();
}
}
// for testing only. Create a session corresponding to a fake request and
// add it to the sessions (avoid NPE in tests)
RepairFuture submitArtificialRepairSession(RepairJobDesc desc)
{
RepairSession session = new RepairSession(desc.sessionId, desc.range, desc.keyspace, false, null, null, new String[]{desc.columnFamily});
sessions.put(session.getId(), session);
RepairFuture futureTask = new RepairFuture(session);
executor.execute(futureTask);
return futureTask;
}
/**
* Return all of the neighbors with whom we share the provided range.
*
* @param keyspaceName keyspace to repair
* @param toRepair token to repair
* @param dataCenters the data centers to involve in the repair
*
* @return neighbors with whom we share the provided range
*/
public static Set getNeighbors(String keyspaceName, Range toRepair, Collection dataCenters, Collection hosts)
{
StorageService ss = StorageService.instance;
Map, List> replicaSets = ss.getRangeToAddressMap(keyspaceName);
Range rangeSuperSet = null;
for (Range range : ss.getLocalRanges(keyspaceName))
{
if (range.contains(toRepair))
{
rangeSuperSet = range;
break;
}
else if (range.intersects(toRepair))
{
throw new IllegalArgumentException("Requested range intersects a local range but is not fully contained in one; this would lead to imprecise repair");
}
}
if (rangeSuperSet == null || !replicaSets.containsKey(rangeSuperSet))
return Collections.emptySet();
Set neighbors = new HashSet<>(replicaSets.get(rangeSuperSet));
neighbors.remove(FBUtilities.getBroadcastAddress());
if (dataCenters != null)
{
TokenMetadata.Topology topology = ss.getTokenMetadata().cloneOnlyTokenMap().getTopology();
Set dcEndpoints = Sets.newHashSet();
Multimap dcEndpointsMap = topology.getDatacenterEndpoints();
for (String dc : dataCenters)
{
Collection c = dcEndpointsMap.get(dc);
if (c != null)
dcEndpoints.addAll(c);
}
return Sets.intersection(neighbors, dcEndpoints);
}
else if (hosts != null)
{
Set specifiedHost = new HashSet<>();
for (final String host : hosts)
{
try
{
final InetAddress endpoint = InetAddress.getByName(host.trim());
if (endpoint.equals(FBUtilities.getBroadcastAddress()) || neighbors.contains(endpoint))
specifiedHost.add(endpoint);
}
catch (UnknownHostException e)
{
throw new IllegalArgumentException("Unknown host specified " + host, e);
}
}
if (!specifiedHost.contains(FBUtilities.getBroadcastAddress()))
throw new IllegalArgumentException("The current host must be part of the repair");
if (specifiedHost.size() <= 1)
{
String msg = "Repair requires at least two endpoints that are neighbours before it can continue, the endpoint used for this repair is %s, " +
"other available neighbours are %s but these neighbours were not part of the supplied list of hosts to use during the repair (%s).";
throw new IllegalArgumentException(String.format(msg, specifiedHost, neighbors, hosts));
}
specifiedHost.remove(FBUtilities.getBroadcastAddress());
return specifiedHost;
}
return neighbors;
}
public void handleMessage(InetAddress endpoint, RepairMessage message)
{
RepairJobDesc desc = message.desc;
RepairSession session = sessions.get(desc.sessionId);
if (session == null)
return;
switch (message.messageType)
{
case VALIDATION_COMPLETE:
ValidationComplete validation = (ValidationComplete) message;
session.validationComplete(desc, endpoint, validation.tree);
break;
case SYNC_COMPLETE:
// one of replica is synced.
SyncComplete sync = (SyncComplete) message;
session.syncComplete(desc, sync.nodes, sync.success);
break;
default:
break;
}
}
}
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