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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.util.Collections;
import java.util.List;
import java.util.concurrent.atomic.AtomicBoolean;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.dht.Range;
import org.apache.cassandra.dht.Token;
import org.apache.cassandra.locator.InetAddressAndPort;
import org.apache.cassandra.locator.RangesAtEndpoint;
import org.apache.cassandra.streaming.PreviewKind;
import org.apache.cassandra.streaming.ProgressInfo;
import org.apache.cassandra.streaming.StreamEvent;
import org.apache.cassandra.streaming.StreamEventHandler;
import org.apache.cassandra.streaming.StreamOperation;
import org.apache.cassandra.streaming.StreamPlan;
import org.apache.cassandra.streaming.StreamSession;
import org.apache.cassandra.streaming.StreamState;
import org.apache.cassandra.tracing.TraceState;
import org.apache.cassandra.tracing.Tracing;
import org.apache.cassandra.utils.FBUtilities;
import org.apache.cassandra.utils.TimeUUID;
import org.apache.cassandra.utils.concurrent.AsyncPromise;
import org.apache.cassandra.utils.concurrent.Promise;
/**
* LocalSyncTask performs streaming between local(coordinator) node and remote replica.
*/
public class LocalSyncTask extends SyncTask implements StreamEventHandler
{
private final TraceState state = Tracing.instance.get();
private static final Logger logger = LoggerFactory.getLogger(LocalSyncTask.class);
private final TimeUUID pendingRepair;
@VisibleForTesting
public final boolean requestRanges;
@VisibleForTesting
public final boolean transferRanges;
private final AtomicBoolean active = new AtomicBoolean(true);
private final Promise planPromise = new AsyncPromise<>();
public LocalSyncTask(SharedContext ctx, RepairJobDesc desc, InetAddressAndPort local, InetAddressAndPort remote,
List> diff, TimeUUID pendingRepair,
boolean requestRanges, boolean transferRanges, PreviewKind previewKind)
{
super(ctx, desc, local, remote, diff, previewKind);
Preconditions.checkArgument(requestRanges || transferRanges, "Nothing to do in a sync job");
Preconditions.checkArgument(local.equals(ctx.broadcastAddressAndPort()));
this.pendingRepair = pendingRepair;
this.requestRanges = requestRanges;
this.transferRanges = transferRanges;
}
@VisibleForTesting
StreamPlan createStreamPlan()
{
InetAddressAndPort remote = nodePair.peer;
StreamPlan plan = new StreamPlan(StreamOperation.REPAIR, 1, false, pendingRepair, previewKind)
.listeners(this)
.flushBeforeTransfer(pendingRepair == null);
if (requestRanges)
{
// see comment on RangesAtEndpoint.toDummyList for why we synthesize replicas here
plan.requestRanges(remote, desc.keyspace, RangesAtEndpoint.toDummyList(rangesToSync),
RangesAtEndpoint.toDummyList(Collections.emptyList()), desc.columnFamily);
}
if (transferRanges)
{
// send ranges to the remote node if we are not performing a pull repair
// see comment on RangesAtEndpoint.toDummyList for why we synthesize replicas here
plan.transferRanges(remote, desc.keyspace, RangesAtEndpoint.toDummyList(rangesToSync), desc.columnFamily);
}
return plan;
}
/**
* Starts sending/receiving our list of differences to/from the remote endpoint: creates a callback
* that will be called out of band once the streams complete.
*/
@Override
protected void startSync()
{
if (active.get())
{
InetAddressAndPort remote = nodePair.peer;
String message = String.format("Performing streaming repair of %d ranges with %s", rangesToSync.size(), remote);
logger.info("{} {}", previewKind.logPrefix(desc.sessionId), message);
Tracing.traceRepair(message);
StreamPlan plan = createStreamPlan();
ctx.streamExecutor().execute(plan);
planPromise.setSuccess(plan);
}
}
@Override
public boolean isLocal()
{
return true;
}
@Override
public void handleStreamEvent(StreamEvent event)
{
if (state == null)
return;
switch (event.eventType)
{
case STREAM_PREPARED:
StreamEvent.SessionPreparedEvent spe = (StreamEvent.SessionPreparedEvent) event;
state.trace("Streaming session with {} prepared", spe.session.peer);
break;
case STREAM_COMPLETE:
StreamEvent.SessionCompleteEvent sce = (StreamEvent.SessionCompleteEvent) event;
state.trace("Streaming session with {} {}", sce.peer, sce.success ? "completed successfully" : "failed");
break;
case FILE_PROGRESS:
ProgressInfo pi = ((StreamEvent.ProgressEvent) event).progress;
state.trace("{}/{} ({}%) {} idx:{}{}",
new Object[] { FBUtilities.prettyPrintMemory(pi.currentBytes),
FBUtilities.prettyPrintMemory(pi.totalBytes),
pi.progressPercentage(),
pi.direction == ProgressInfo.Direction.OUT ? "sent to" : "received from",
pi.sessionIndex,
pi.peer });
}
}
@Override
public void onSuccess(StreamState result)
{
if (active.compareAndSet(true, false))
{
String status = result.hasAbortedSession() ? "aborted" : "complete";
String message = String.format("Sync %s using session %s between %s and %s on %s",
status, desc.sessionId, nodePair.coordinator, nodePair.peer, desc.columnFamily);
logger.info("{} {}", previewKind.logPrefix(desc.sessionId), message);
Tracing.traceRepair(message);
trySuccess(result.hasAbortedSession() ? stat : stat.withSummaries(result.createSummaries()));
finished();
}
}
@Override
public void onFailure(Throwable t)
{
if (active.compareAndSet(true, false))
{
tryFailure(t);
finished();
}
}
@Override
public String toString()
{
return "LocalSyncTask{" +
"requestRanges=" + requestRanges +
", transferRanges=" + transferRanges +
", rangesToSync=" + rangesToSync +
", nodePair=" + nodePair +
'}';
}
@Override
public void abort(Throwable reason)
{
super.abort(reason);
planPromise.addCallback((plan, cause) ->
{
assert plan != null : "StreamPlan future should never be completed exceptionally";
plan.getCoordinator().getAllStreamSessions().forEach(StreamSession::abort);
});
}
}