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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.
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/*
 * 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.List;
import java.util.concurrent.TimeUnit;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
import com.google.common.util.concurrent.AbstractFuture;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.apache.cassandra.db.Keyspace;
import org.apache.cassandra.dht.Range;
import org.apache.cassandra.dht.Token;
import org.apache.cassandra.locator.InetAddressAndPort;
import org.apache.cassandra.repair.messages.RepairMessage;
import org.apache.cassandra.repair.messages.SyncRequest;
import org.apache.cassandra.streaming.PreviewKind;
import org.apache.cassandra.tracing.Tracing;

import static org.apache.cassandra.net.Verb.SYNC_REQ;

public abstract class SyncTask extends AbstractFuture implements Runnable
{
    private static final Logger logger = LoggerFactory.getLogger(SyncTask.class);

    protected final RepairJobDesc desc;
    @VisibleForTesting
    public final List> rangesToSync;
    protected final PreviewKind previewKind;
    protected final SyncNodePair nodePair;

    protected volatile long startTime = Long.MIN_VALUE;
    protected final SyncStat stat;

    protected SyncTask(RepairJobDesc desc, InetAddressAndPort primaryEndpoint, InetAddressAndPort peer, List> rangesToSync, PreviewKind previewKind)
    {
        Preconditions.checkArgument(!peer.equals(primaryEndpoint), "Sending and receiving node are the same: %s", peer);
        this.desc = desc;
        this.rangesToSync = rangesToSync;
        this.nodePair = new SyncNodePair(primaryEndpoint, peer);
        this.previewKind = previewKind;
        this.stat = new SyncStat(nodePair, rangesToSync.size());
    }

    protected abstract void startSync();

    public SyncNodePair nodePair()
    {
        return nodePair;
    }

    /**
     * Compares trees, and triggers repairs for any ranges that mismatch.
     */
    public final void run()
    {
        startTime = System.currentTimeMillis();


        // choose a repair method based on the significance of the difference
        String format = String.format("%s Endpoints %s and %s %%s for %s", previewKind.logPrefix(desc.sessionId), nodePair.coordinator, nodePair.peer, desc.columnFamily);
        if (rangesToSync.isEmpty())
        {
            logger.info(String.format(format, "are consistent"));
            Tracing.traceRepair("Endpoint {} is consistent with {} for {}", nodePair.coordinator, nodePair.peer, desc.columnFamily);
            set(stat);
            return;
        }

        // non-0 difference: perform streaming repair
        logger.info(String.format(format, "have " + rangesToSync.size() + " range(s) out of sync"));
        Tracing.traceRepair("Endpoint {} has {} range(s) out of sync with {} for {}", nodePair.coordinator, rangesToSync.size(), nodePair.peer, desc.columnFamily);
        startSync();
    }

    public boolean isLocal()
    {
        return false;
    }

    protected void finished()
    {
        if (startTime != Long.MIN_VALUE)
            Keyspace.open(desc.keyspace).getColumnFamilyStore(desc.columnFamily).metric.repairSyncTime.update(System.currentTimeMillis() - startTime, TimeUnit.MILLISECONDS);
    }

    public void abort() {}

    void sendRequest(SyncRequest request, InetAddressAndPort to)
    {
        RepairMessage.sendMessageWithFailureCB(request,
                                               SYNC_REQ,
                                               to,
                                               this::setException);
    }
}