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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.dht;
import java.net.InetAddress;
import java.util.*;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.HashMultimap;
import com.google.common.collect.Multimap;
import com.google.common.collect.Sets;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.db.Keyspace;
import org.apache.cassandra.db.SystemKeyspace;
import org.apache.cassandra.gms.EndpointState;
import org.apache.cassandra.gms.Gossiper;
import org.apache.cassandra.gms.IFailureDetector;
import org.apache.cassandra.locator.AbstractReplicationStrategy;
import org.apache.cassandra.locator.IEndpointSnitch;
import org.apache.cassandra.locator.TokenMetadata;
import org.apache.cassandra.service.StorageService;
import org.apache.cassandra.streaming.StreamPlan;
import org.apache.cassandra.streaming.StreamResultFuture;
import org.apache.cassandra.utils.FBUtilities;
/**
* Assists in streaming ranges to a node.
*/
public class RangeStreamer
{
private static final Logger logger = LoggerFactory.getLogger(RangeStreamer.class);
/* bootstrap tokens. can be null if replacing the node. */
private final Collection tokens;
/* current token ring */
private final TokenMetadata metadata;
/* address of this node */
private final InetAddress address;
/* streaming description */
private final String description;
private final Multimap>>> toFetch = HashMultimap.create();
private final Set sourceFilters = new HashSet<>();
private final StreamPlan streamPlan;
private final boolean useStrictConsistency;
private final IEndpointSnitch snitch;
private final StreamStateStore stateStore;
/**
* A filter applied to sources to stream from when constructing a fetch map.
*/
public static interface ISourceFilter
{
public boolean shouldInclude(InetAddress endpoint);
}
/**
* Source filter which excludes any endpoints that are not alive according to a
* failure detector.
*/
public static class FailureDetectorSourceFilter implements ISourceFilter
{
private final IFailureDetector fd;
public FailureDetectorSourceFilter(IFailureDetector fd)
{
this.fd = fd;
}
public boolean shouldInclude(InetAddress endpoint)
{
return fd.isAlive(endpoint);
}
}
/**
* Source filter which excludes any endpoints that are not in a specific data center.
*/
public static class SingleDatacenterFilter implements ISourceFilter
{
private final String sourceDc;
private final IEndpointSnitch snitch;
public SingleDatacenterFilter(IEndpointSnitch snitch, String sourceDc)
{
this.sourceDc = sourceDc;
this.snitch = snitch;
}
public boolean shouldInclude(InetAddress endpoint)
{
return snitch.getDatacenter(endpoint).equals(sourceDc);
}
}
/**
* Source filter which excludes the current node from source calculations
*/
public static class ExcludeLocalNodeFilter implements ISourceFilter
{
public boolean shouldInclude(InetAddress endpoint)
{
return !FBUtilities.getBroadcastAddress().equals(endpoint);
}
}
public RangeStreamer(TokenMetadata metadata,
Collection tokens,
InetAddress address,
String description,
boolean useStrictConsistency,
IEndpointSnitch snitch,
StreamStateStore stateStore)
{
this.metadata = metadata;
this.tokens = tokens;
this.address = address;
this.description = description;
this.streamPlan = new StreamPlan(description, true);
this.useStrictConsistency = useStrictConsistency;
this.snitch = snitch;
this.stateStore = stateStore;
streamPlan.listeners(this.stateStore);
}
public void addSourceFilter(ISourceFilter filter)
{
sourceFilters.add(filter);
}
/**
* Add ranges to be streamed for given keyspace.
*
* @param keyspaceName keyspace name
* @param ranges ranges to be streamed
*/
public void addRanges(String keyspaceName, Collection> ranges)
{
Multimap, InetAddress> rangesForKeyspace = useStrictSourcesForRanges(keyspaceName)
? getAllRangesWithStrictSourcesFor(keyspaceName, ranges) : getAllRangesWithSourcesFor(keyspaceName, ranges);
if (logger.isTraceEnabled())
{
for (Map.Entry, InetAddress> entry : rangesForKeyspace.entries())
logger.trace(String.format("%s: range %s exists on %s", description, entry.getKey(), entry.getValue()));
}
for (Map.Entry>> entry : getRangeFetchMap(rangesForKeyspace, sourceFilters, keyspaceName, useStrictConsistency).asMap().entrySet())
{
if (logger.isTraceEnabled())
{
for (Range r : entry.getValue())
logger.trace(String.format("%s: range %s from source %s for keyspace %s", description, r, entry.getKey(), keyspaceName));
}
toFetch.put(keyspaceName, entry);
}
}
/**
* @param keyspaceName keyspace name to check
* @return true when the node is bootstrapping, useStrictConsistency is true and # of nodes in the cluster is more than # of replica
*/
private boolean useStrictSourcesForRanges(String keyspaceName)
{
AbstractReplicationStrategy strat = Keyspace.open(keyspaceName).getReplicationStrategy();
return useStrictConsistency
&& tokens != null
&& metadata.getAllEndpoints().size() != strat.getReplicationFactor();
}
/**
* Get a map of all ranges and their respective sources that are candidates for streaming the given ranges
* to us. For each range, the list of sources is sorted by proximity relative to the given destAddress.
*
* @throws java.lang.IllegalStateException when there is no source to get data streamed
*/
private Multimap, InetAddress> getAllRangesWithSourcesFor(String keyspaceName, Collection> desiredRanges)
{
AbstractReplicationStrategy strat = Keyspace.open(keyspaceName).getReplicationStrategy();
Multimap, InetAddress> rangeAddresses = strat.getRangeAddresses(metadata.cloneOnlyTokenMap());
Multimap, InetAddress> rangeSources = ArrayListMultimap.create();
for (Range desiredRange : desiredRanges)
{
for (Range range : rangeAddresses.keySet())
{
if (range.contains(desiredRange))
{
List preferred = snitch.getSortedListByProximity(address, rangeAddresses.get(range));
rangeSources.putAll(desiredRange, preferred);
break;
}
}
if (!rangeSources.keySet().contains(desiredRange))
throw new IllegalStateException("No sources found for " + desiredRange);
}
return rangeSources;
}
/**
* Get a map of all ranges and the source that will be cleaned up once this bootstrapped node is added for the given ranges.
* For each range, the list should only contain a single source. This allows us to consistently migrate data without violating
* consistency.
*
* @throws java.lang.IllegalStateException when there is no source to get data streamed, or more than 1 source found.
*/
private Multimap, InetAddress> getAllRangesWithStrictSourcesFor(String keyspace, Collection> desiredRanges)
{
assert tokens != null;
AbstractReplicationStrategy strat = Keyspace.open(keyspace).getReplicationStrategy();
// Active ranges
TokenMetadata metadataClone = metadata.cloneOnlyTokenMap();
Multimap, InetAddress> addressRanges = strat.getRangeAddresses(metadataClone);
// Pending ranges
metadataClone.updateNormalTokens(tokens, address);
Multimap, InetAddress> pendingRangeAddresses = strat.getRangeAddresses(metadataClone);
// Collects the source that will have its range moved to the new node
Multimap, InetAddress> rangeSources = ArrayListMultimap.create();
for (Range desiredRange : desiredRanges)
{
for (Map.Entry, Collection> preEntry : addressRanges.asMap().entrySet())
{
if (preEntry.getKey().contains(desiredRange))
{
Set oldEndpoints = Sets.newHashSet(preEntry.getValue());
Set newEndpoints = Sets.newHashSet(pendingRangeAddresses.get(desiredRange));
// Due to CASSANDRA-5953 we can have a higher RF then we have endpoints.
// So we need to be careful to only be strict when endpoints == RF
if (oldEndpoints.size() == strat.getReplicationFactor())
{
oldEndpoints.removeAll(newEndpoints);
assert oldEndpoints.size() == 1 : "Expected 1 endpoint but found " + oldEndpoints.size();
}
rangeSources.put(desiredRange, oldEndpoints.iterator().next());
}
}
// Validate
Collection addressList = rangeSources.get(desiredRange);
if (addressList == null || addressList.isEmpty())
throw new IllegalStateException("No sources found for " + desiredRange);
if (addressList.size() > 1)
throw new IllegalStateException("Multiple endpoints found for " + desiredRange);
InetAddress sourceIp = addressList.iterator().next();
EndpointState sourceState = Gossiper.instance.getEndpointStateForEndpoint(sourceIp);
if (Gossiper.instance.isEnabled() && (sourceState == null || !sourceState.isAlive()))
throw new RuntimeException("A node required to move the data consistently is down (" + sourceIp + "). " +
"If you wish to move the data from a potentially inconsistent replica, restart the node with -Dcassandra.consistent.rangemovement=false");
}
return rangeSources;
}
/**
* @param rangesWithSources The ranges we want to fetch (key) and their potential sources (value)
* @param sourceFilters A (possibly empty) collection of source filters to apply. In addition to any filters given
* here, we always exclude ourselves.
* @param keyspace keyspace name
* @return Map of source endpoint to collection of ranges
*/
private static Multimap> getRangeFetchMap(Multimap, InetAddress> rangesWithSources,
Collection sourceFilters, String keyspace,
boolean useStrictConsistency)
{
Multimap> rangeFetchMapMap = HashMultimap.create();
for (Range range : rangesWithSources.keySet())
{
boolean foundSource = false;
outer:
for (InetAddress address : rangesWithSources.get(range))
{
for (ISourceFilter filter : sourceFilters)
{
if (!filter.shouldInclude(address))
continue outer;
}
if (address.equals(FBUtilities.getBroadcastAddress()))
{
// If localhost is a source, we have found one, but we don't add it to the map to avoid streaming locally
foundSource = true;
continue;
}
rangeFetchMapMap.put(address, range);
foundSource = true;
break; // ensure we only stream from one other node for each range
}
if (!foundSource)
{
AbstractReplicationStrategy strat = Keyspace.open(keyspace).getReplicationStrategy();
if (strat != null && strat.getReplicationFactor() == 1)
{
if (useStrictConsistency)
throw new IllegalStateException("Unable to find sufficient sources for streaming range " + range + " in keyspace " + keyspace + " with RF=1. " +
"Ensure this keyspace contains replicas in the source datacenter.");
else
logger.warn("Unable to find sufficient sources for streaming range " + range + " in keyspace " + keyspace + " with RF=1. " +
"Keyspace might be missing data.");
}
else
throw new IllegalStateException("Unable to find sufficient sources for streaming range " + range + " in keyspace " + keyspace);
}
}
return rangeFetchMapMap;
}
public static Multimap> getWorkMap(Multimap, InetAddress> rangesWithSourceTarget, String keyspace,
IFailureDetector fd, boolean useStrictConsistency)
{
return getRangeFetchMap(rangesWithSourceTarget, Collections.singleton(new FailureDetectorSourceFilter(fd)), keyspace, useStrictConsistency);
}
// For testing purposes
@VisibleForTesting
Multimap>>> toFetch()
{
return toFetch;
}
public StreamResultFuture fetchAsync()
{
for (Map.Entry>>> entry : toFetch.entries())
{
String keyspace = entry.getKey();
InetAddress source = entry.getValue().getKey();
InetAddress preferred = SystemKeyspace.getPreferredIP(source);
Collection> ranges = entry.getValue().getValue();
// filter out already streamed ranges
Set> availableRanges = stateStore.getAvailableRanges(keyspace, StorageService.instance.getTokenMetadata().partitioner);
if (ranges.removeAll(availableRanges))
{
logger.info("Some ranges of {} are already available. Skipping streaming those ranges.", availableRanges);
}
if (logger.isTraceEnabled())
logger.trace("{}ing from {} ranges {}", description, source, StringUtils.join(ranges, ", "));
/* Send messages to respective folks to stream data over to me */
streamPlan.requestRanges(source, preferred, keyspace, ranges);
}
return streamPlan.execute();
}
}
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