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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* 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,
* 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.
*/
package org.apache.cassandra.repair;
import java.net.InetAddress;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Queue;
import java.util.concurrent.CancellationException;
import java.util.concurrent.ExecutionException;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.util.concurrent.AbstractFuture;
import com.google.common.util.concurrent.AsyncFunction;
import com.google.common.util.concurrent.FutureCallback;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.ListeningExecutorService;
import com.google.common.util.concurrent.UncheckedExecutionException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.config.DatabaseDescriptor;
import org.apache.cassandra.db.Keyspace;
import org.apache.cassandra.dht.Range;
import org.apache.cassandra.dht.Token;
import org.apache.cassandra.tracing.Tracing;
import org.apache.cassandra.utils.FBUtilities;
import org.apache.cassandra.utils.MerkleTrees;
import org.apache.cassandra.utils.Pair;
/**
* RepairJob runs repair on given ColumnFamily.
*/
public class RepairJob extends AbstractFuture implements Runnable
{
private static Logger logger = LoggerFactory.getLogger(RepairJob.class);
private final RepairSession session;
private final RepairJobDesc desc;
private final RepairParallelism parallelismDegree;
private final long repairedAt;
private final ListeningExecutorService taskExecutor;
/**
* Create repair job to run on specific columnfamily
*
* @param session RepairSession that this RepairJob belongs
* @param columnFamily name of the ColumnFamily to repair
*/
public RepairJob(RepairSession session, String columnFamily)
{
this.session = session;
this.desc = new RepairJobDesc(session.parentRepairSession, session.getId(), session.keyspace, columnFamily, session.getRanges());
this.repairedAt = session.repairedAt;
this.taskExecutor = session.taskExecutor;
this.parallelismDegree = session.parallelismDegree;
}
/**
* Runs repair job.
*
* This sets up necessary task and runs them on given {@code taskExecutor}.
* After submitting all tasks, waits until validation with replica completes.
*/
public void run()
{
List allEndpoints = new ArrayList<>(session.endpoints);
allEndpoints.add(FBUtilities.getBroadcastAddress());
ListenableFuture> validations;
// Create a snapshot at all nodes unless we're using pure parallel repairs
if (parallelismDegree != RepairParallelism.PARALLEL)
{
// Request snapshot to all replica
List> snapshotTasks = new ArrayList<>(allEndpoints.size());
for (InetAddress endpoint : allEndpoints)
{
SnapshotTask snapshotTask = new SnapshotTask(desc, endpoint);
snapshotTasks.add(snapshotTask);
taskExecutor.execute(snapshotTask);
}
// When all snapshot complete, send validation requests
ListenableFuture> allSnapshotTasks = Futures.allAsList(snapshotTasks);
validations = Futures.transform(allSnapshotTasks, new AsyncFunction, List>()
{
public ListenableFuture> apply(List endpoints)
{
if (parallelismDegree == RepairParallelism.SEQUENTIAL)
return sendSequentialValidationRequest(endpoints);
else
return sendDCAwareValidationRequest(endpoints);
}
}, taskExecutor);
}
else
{
// If not sequential, just send validation request to all replica
validations = sendValidationRequest(allEndpoints);
}
// When all validations complete, submit sync tasks
ListenableFuture> syncResults = Futures.transform(validations, new AsyncFunction, List>()
{
public ListenableFuture> apply(List trees)
{
return Futures.allAsList(createSyncTasks(trees, FBUtilities.getLocalAddress()));
}
}, taskExecutor);
// When all sync complete, set the final result
Futures.addCallback(syncResults, new FutureCallback>()
{
public void onSuccess(List stats)
{
logger.info("[repair #{}] {} is fully synced", session.getId(), desc.columnFamily);
SystemDistributedKeyspace.successfulRepairJob(session.getId(), desc.keyspace, desc.columnFamily);
set(new RepairResult(desc, stats));
}
/**
* Snapshot, validation and sync failures are all handled here
*/
public void onFailure(Throwable t)
{
logger.warn("[repair #{}] {} sync failed", session.getId(), desc.columnFamily);
SystemDistributedKeyspace.failedRepairJob(session.getId(), desc.keyspace, desc.columnFamily, t);
setException(t);
}
}, taskExecutor);
// Wait for validation to complete
try
{
syncResults.get();
}
catch (CancellationException | ExecutionException ignored)
{
// this is already handled in the listener
}
catch (InterruptedException e)
{
Thread.currentThread().interrupt();
throw new UncheckedExecutionException(e);
}
}
@VisibleForTesting
List createSyncTasks(List trees, InetAddress local)
{
List syncTasks = new ArrayList<>();
// We need to difference all trees one against another
for (int i = 0; i < trees.size() - 1; ++i)
{
TreeResponse r1 = trees.get(i);
for (int j = i + 1; j < trees.size(); ++j)
{
TreeResponse r2 = trees.get(j);
SyncTask task;
List> differences = MerkleTrees.difference(r1.trees, r2.trees);
if (r1.endpoint.equals(local) || r2.endpoint.equals(local))
{
task = new LocalSyncTask(desc, r1.endpoint, r2.endpoint, differences, repairedAt, session.pullRepair);
}
else
{
task = new RemoteSyncTask(desc, r1.endpoint, r2.endpoint, differences);
// RemoteSyncTask expects SyncComplete message sent back.
// Register task to RepairSession to receive response.
session.waitForSync(Pair.create(desc, new NodePair(r1.endpoint, r2.endpoint)), (RemoteSyncTask) task);
}
syncTasks.add(task);
taskExecutor.submit(task);
}
}
return syncTasks;
}
/**
* Creates {@link ValidationTask} and submit them to task executor in parallel.
*
* @param endpoints Endpoint addresses to send validation request
* @return Future that can get all {@link TreeResponse} from replica, if all validation succeed.
*/
private ListenableFuture> sendValidationRequest(Collection endpoints)
{
String message = String.format("Requesting merkle trees for %s (to %s)", desc.columnFamily, endpoints);
logger.info("[repair #{}] {}", desc.sessionId, message);
Tracing.traceRepair(message);
int gcBefore = Keyspace.open(desc.keyspace).getColumnFamilyStore(desc.columnFamily).gcBefore(FBUtilities.nowInSeconds());
List> tasks = new ArrayList<>(endpoints.size());
for (InetAddress endpoint : endpoints)
{
ValidationTask task = new ValidationTask(desc, endpoint, gcBefore);
tasks.add(task);
session.waitForValidation(Pair.create(desc, endpoint), task);
taskExecutor.execute(task);
}
return Futures.allAsList(tasks);
}
/**
* Creates {@link ValidationTask} and submit them to task executor so that tasks run sequentially.
*/
private ListenableFuture> sendSequentialValidationRequest(Collection endpoints)
{
String message = String.format("Requesting merkle trees for %s (to %s)", desc.columnFamily, endpoints);
logger.info("[repair #{}] {}", desc.sessionId, message);
Tracing.traceRepair(message);
int gcBefore = Keyspace.open(desc.keyspace).getColumnFamilyStore(desc.columnFamily).gcBefore(FBUtilities.nowInSeconds());
List> tasks = new ArrayList<>(endpoints.size());
Queue requests = new LinkedList<>(endpoints);
InetAddress address = requests.poll();
ValidationTask firstTask = new ValidationTask(desc, address, gcBefore);
logger.info("Validating {}", address);
session.waitForValidation(Pair.create(desc, address), firstTask);
tasks.add(firstTask);
ValidationTask currentTask = firstTask;
while (requests.size() > 0)
{
final InetAddress nextAddress = requests.poll();
final ValidationTask nextTask = new ValidationTask(desc, nextAddress, gcBefore);
tasks.add(nextTask);
Futures.addCallback(currentTask, new FutureCallback()
{
public void onSuccess(TreeResponse result)
{
logger.info("Validating {}", nextAddress);
session.waitForValidation(Pair.create(desc, nextAddress), nextTask);
taskExecutor.execute(nextTask);
}
// failure is handled at root of job chain
public void onFailure(Throwable t) {}
});
currentTask = nextTask;
}
// start running tasks
taskExecutor.execute(firstTask);
return Futures.allAsList(tasks);
}
/**
* Creates {@link ValidationTask} and submit them to task executor so that tasks run sequentially within each dc.
*/
private ListenableFuture> sendDCAwareValidationRequest(Collection endpoints)
{
String message = String.format("Requesting merkle trees for %s (to %s)", desc.columnFamily, endpoints);
logger.info("[repair #{}] {}", desc.sessionId, message);
Tracing.traceRepair(message);
int gcBefore = Keyspace.open(desc.keyspace).getColumnFamilyStore(desc.columnFamily).gcBefore(FBUtilities.nowInSeconds());
List> tasks = new ArrayList<>(endpoints.size());
Map> requestsByDatacenter = new HashMap<>();
for (InetAddress endpoint : endpoints)
{
String dc = DatabaseDescriptor.getEndpointSnitch().getDatacenter(endpoint);
Queue queue = requestsByDatacenter.get(dc);
if (queue == null)
{
queue = new LinkedList<>();
requestsByDatacenter.put(dc, queue);
}
queue.add(endpoint);
}
for (Map.Entry> entry : requestsByDatacenter.entrySet())
{
Queue requests = entry.getValue();
InetAddress address = requests.poll();
ValidationTask firstTask = new ValidationTask(desc, address, gcBefore);
logger.info("Validating {}", address);
session.waitForValidation(Pair.create(desc, address), firstTask);
tasks.add(firstTask);
ValidationTask currentTask = firstTask;
while (requests.size() > 0)
{
final InetAddress nextAddress = requests.poll();
final ValidationTask nextTask = new ValidationTask(desc, nextAddress, gcBefore);
tasks.add(nextTask);
Futures.addCallback(currentTask, new FutureCallback()
{
public void onSuccess(TreeResponse result)
{
logger.info("Validating {}", nextAddress);
session.waitForValidation(Pair.create(desc, nextAddress), nextTask);
taskExecutor.execute(nextTask);
}
// failure is handled at root of job chain
public void onFailure(Throwable t) {}
});
currentTask = nextTask;
}
// start running tasks
taskExecutor.execute(firstTask);
}
return Futures.allAsList(tasks);
}
}
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