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StoreFetcher.java
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StoreFetcher.java
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/*
* Copyright (c) 2002-2016 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.coreedge.catchup.storecopy;
import java.io.File;
import java.io.IOException;
import org.neo4j.coreedge.catchup.CatchUpClientException;
import org.neo4j.coreedge.catchup.CatchupResult;
import org.neo4j.coreedge.catchup.tx.TransactionLogCatchUpFactory;
import org.neo4j.coreedge.catchup.tx.TransactionLogCatchUpWriter;
import org.neo4j.coreedge.catchup.tx.TxPullClient;
import org.neo4j.coreedge.discovery.NoKnownAddressesException;
import org.neo4j.coreedge.identity.MemberId;
import org.neo4j.coreedge.identity.StoreId;
import org.neo4j.io.fs.FileSystemAbstraction;
import org.neo4j.io.pagecache.PageCache;
import org.neo4j.kernel.impl.transaction.log.ReadOnlyTransactionIdStore;
import org.neo4j.logging.Log;
import org.neo4j.logging.LogProvider;
import static org.neo4j.coreedge.catchup.CatchupResult.SUCCESS;
public class StoreFetcher
{
private final Log log;
private FileSystemAbstraction fs;
private PageCache pageCache;
private final LogProvider logProvider;
private StoreCopyClient storeCopyClient;
private TxPullClient txPullClient;
private TransactionLogCatchUpFactory transactionLogFactory;
public StoreFetcher( LogProvider logProvider,
FileSystemAbstraction fs, PageCache pageCache,
StoreCopyClient storeCopyClient, TxPullClient txPullClient,
TransactionLogCatchUpFactory transactionLogFactory )
{
this.logProvider = logProvider;
this.storeCopyClient = storeCopyClient;
this.txPullClient = txPullClient;
this.fs = fs;
this.pageCache = pageCache;
this.transactionLogFactory = transactionLogFactory;
log = logProvider.getLog( getClass() );
}
public CatchupResult tryCatchingUp( MemberId from, StoreId expectedStoreId, File storeDir ) throws StoreCopyFailedException, IOException
{
ReadOnlyTransactionIdStore transactionIdStore = new ReadOnlyTransactionIdStore( pageCache, storeDir );
long lastCommittedTxId = transactionIdStore.getLastCommittedTransactionId();
return pullTransactions( from, expectedStoreId, storeDir, lastCommittedTxId - 1 );
}
private CatchupResult pullTransactions( MemberId from, StoreId expectedStoreId, File storeDir, long fromTxId ) throws IOException, StoreCopyFailedException
{
try ( TransactionLogCatchUpWriter writer = transactionLogFactory.create( storeDir, fs, pageCache, logProvider ) )
{
log.info( "Pulling transactions from: %d", fromTxId );
return txPullClient.pullTransactions( from, expectedStoreId, fromTxId, writer );
}
catch ( CatchUpClientException | NoKnownAddressesException e )
{
throw new StoreCopyFailedException( e );
}
}
public void copyStore( MemberId from, StoreId expectedStoreId, File destDir )
throws StoreCopyFailedException, StreamingTransactionsFailedException
{
try
{
log.info( "Copying store from %s", from );
long lastFlushedTxId = storeCopyClient.copyStoreFiles( from, expectedStoreId, new StreamToDisk( destDir, fs ) );
// We require at least one transaction for extracting the log index of the consensus log.
// Given there might not have been any activity on the source server we need to ask for the
// log entry for the lastFlushedTxId even though we've already applied its contents
long pullTxIndex = lastFlushedTxId - 1;
log.info( "Store files need to be recovered starting from: %d", pullTxIndex );
CatchupResult catchupResult = pullTransactions( from, expectedStoreId, destDir, pullTxIndex );
if ( catchupResult != SUCCESS )
{
throw new StreamingTransactionsFailedException( "Failed to pull transactions: " + catchupResult );
}
}
catch ( IOException e )
{
throw new StoreCopyFailedException( e );
}
}
public StoreId getStoreIdOf( MemberId from ) throws StoreIdDownloadFailedException
{
return storeCopyClient.fetchStoreId( from );
}
}