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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.util.Set;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.Streams;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.db.SystemKeyspace;
import org.apache.cassandra.streaming.StreamEvent;
import org.apache.cassandra.streaming.StreamEventHandler;
import org.apache.cassandra.streaming.StreamRequest;
import org.apache.cassandra.streaming.StreamState;
/**
* Store and update available ranges (data already received) to system keyspace.
*/
public class StreamStateStore implements StreamEventHandler
{
private static final Logger logger = LoggerFactory.getLogger(StreamStateStore.class);
public SystemKeyspace.AvailableRanges getAvailableRanges(String keyspace, IPartitioner partitioner)
{
return SystemKeyspace.getAvailableRanges(keyspace, partitioner);
}
/**
* Check if given token's data is available in this node. This doesn't handle transientness in a useful way
* so it's only used by a legacy test
*
* @param keyspace keyspace name
* @param token token to check
* @return true if given token in the keyspace is already streamed and ready to be served.
*/
@VisibleForTesting
public boolean isDataAvailable(String keyspace, Token token)
{
SystemKeyspace.AvailableRanges availableRanges = getAvailableRanges(keyspace, token.getPartitioner());
return Streams.concat(availableRanges.full.stream(),
availableRanges.trans.stream())
.anyMatch(range -> range.contains(token));
}
/**
* When StreamSession completes, make all keyspaces/ranges in session available to be served.
*
* @param event Stream event.
*/
@Override
public void handleStreamEvent(StreamEvent event)
{
if (event.eventType == StreamEvent.Type.STREAM_COMPLETE)
{
StreamEvent.SessionCompleteEvent se = (StreamEvent.SessionCompleteEvent) event;
if (se.success)
{
Set keyspaces = se.transferredRangesPerKeyspace.keySet();
for (String keyspace : keyspaces)
{
SystemKeyspace.updateTransferredRanges(se.streamOperation, se.peer, keyspace, se.transferredRangesPerKeyspace.get(keyspace));
}
for (StreamRequest request : se.requests)
{
SystemKeyspace.updateAvailableRanges(request.keyspace, request.full.ranges(), request.transientReplicas.ranges());
}
}
}
}
@Override
public void onSuccess(StreamState streamState) {}
@Override
public void onFailure(Throwable throwable) {}
}