mirror of
https://github.com/Alfresco/alfresco-community-repo.git
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43e93f3c14
git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@18926 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261
729 lines
28 KiB
Java
729 lines
28 KiB
Java
/*
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* Copyright (C) 2005-2010 Alfresco Software Limited.
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*
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* This file is part of Alfresco
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*
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* Alfresco is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Alfresco is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.alfresco.repo.node.index;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.Date;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Map;
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import java.util.TreeMap;
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import org.alfresco.error.AlfrescoRuntimeException;
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import org.alfresco.repo.domain.Transaction;
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import org.alfresco.repo.transaction.RetryingTransactionHelper;
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import org.alfresco.repo.transaction.RetryingTransactionHelper.RetryingTransactionCallback;
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import org.springframework.extensions.surf.util.ISO8601DateFormat;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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/**
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* Component to check and recover the indexes.
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*
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* @author Derek Hulley
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*/
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public class IndexTransactionTracker extends AbstractReindexComponent
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{
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private static Log logger = LogFactory.getLog(IndexTransactionTracker.class);
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private IndexTransactionTrackerListener listener;
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private NodeIndexer nodeIndexer;
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private long maxTxnDurationMs;
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private long reindexLagMs;
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private int maxRecordSetSize;
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private int maxTransactionsPerLuceneCommit;
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private boolean disableInTransactionIndexing;
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private boolean started;
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private List<Long> previousTxnIds;
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private Long lastMaxTxnId;
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private long fromTimeInclusive;
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private Map<Long, TxnRecord> voids;
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private boolean forceReindex;
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private long fromTxnId;
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private String statusMsg;
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private static final String NO_REINDEX = "No reindex in progress";
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/**
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* Set the defaults.
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* <ul>
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* <li><b>Maximum transaction duration:</b> 1 hour</li>
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* <li><b>Reindex lag:</b> 1 second</li>
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* <li><b>Maximum recordset size:</b> 1000</li>
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* <li><b>Maximum transactions per Lucene commit:</b> 100</li>
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* <li><b>Disable in-transaction indexing:</b> false</li>
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* </ul>
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*/
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public IndexTransactionTracker()
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{
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maxTxnDurationMs = 3600L * 1000L;
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reindexLagMs = 1000L;
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maxRecordSetSize = 1000;
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maxTransactionsPerLuceneCommit = 100;
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disableInTransactionIndexing = false;
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started = false;
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previousTxnIds = Collections.<Long>emptyList();
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lastMaxTxnId = Long.MAX_VALUE;
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fromTimeInclusive = -1L;
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voids = new TreeMap<Long, TxnRecord>();
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forceReindex = false;
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fromTxnId = 0L;
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statusMsg = NO_REINDEX;
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}
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public synchronized void setListener(IndexTransactionTrackerListener listener)
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{
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this.listener = listener;
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}
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public void setNodeIndexer(NodeIndexer nodeIndexer)
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{
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this.nodeIndexer = nodeIndexer;
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}
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/**
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* Set the expected maximum duration of transaction supported. This value is used to adjust the
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* look-back used to detect transactions that committed. Values must be greater than zero.
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*
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* @param maxTxnDurationMinutes the maximum length of time a transaction will take in minutes
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*
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* @since 1.4.5, 2.0.5, 2.1.1
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*/
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public void setMaxTxnDurationMinutes(long maxTxnDurationMinutes)
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{
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if (maxTxnDurationMinutes < 1)
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{
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throw new AlfrescoRuntimeException("Maximum transaction duration must be at least one minute.");
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}
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this.maxTxnDurationMs = maxTxnDurationMinutes * 60L * 1000L;
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}
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/**
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* Transaction tracking should lag by the average commit time for a transaction. This will minimize
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* the number of holes in the transaction sequence. Values must be greater than zero.
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*
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* @param reindexLagMs the minimum age of a transaction to be considered by
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* the index transaction tracking
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*
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* @since 1.4.5, 2.0.5, 2.1.1
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*/
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public void setReindexLagMs(long reindexLagMs)
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{
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if (reindexLagMs < 1)
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{
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throw new AlfrescoRuntimeException("Reindex lag must be at least 1 millisecond.");
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}
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this.reindexLagMs = reindexLagMs;
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}
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/**
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* Set the number of transactions to request per query.
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*/
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public void setMaxRecordSetSize(int maxRecordSetSize)
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{
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this.maxRecordSetSize = maxRecordSetSize;
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}
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/**
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* Set the number of transactions to process per Lucene write.
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* Larger values generate less contention on the Lucene IndexInfo files.
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*/
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public void setMaxTransactionsPerLuceneCommit(int maxTransactionsPerLuceneCommit)
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{
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this.maxTransactionsPerLuceneCommit = maxTransactionsPerLuceneCommit;
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}
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/**
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* Enable or disabled in-transaction indexing. Under certain circumstances, the system
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* can run with only index tracking enabled - in-transaction indexing is not always
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* required. The {@link NodeIndexer} is disabled when this component initialises.
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*/
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public void setDisableInTransactionIndexing(boolean disableInTransactionIndexing)
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{
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this.disableInTransactionIndexing = disableInTransactionIndexing;
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}
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/**
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* @return Returns <tt>false</tt> always. Transactions are handled internally.
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*/
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@Override
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protected boolean requireTransaction()
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{
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return false;
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}
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/** Worker callback for transactional use */
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RetryingTransactionCallback<Long> getStartingCommitTimeWork = new RetryingTransactionCallback<Long>()
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{
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public Long execute() throws Exception
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{
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return getStartingTxnCommitTime();
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}
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};
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/** Worker callback for transactional use */
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RetryingTransactionCallback<Boolean> reindexWork = new RetryingTransactionCallback<Boolean>()
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{
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public Boolean execute() throws Exception
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{
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return reindexInTransaction();
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}
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};
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public void resetFromTxn(long txnId)
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{
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if (logger.isInfoEnabled())
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{
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logger.info("resetFromTxn: " + txnId);
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}
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this.fromTxnId = txnId;
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this.started = false; // this will cause index tracker to break out (so that it can be re-started)
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}
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@Override
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protected void reindexImpl()
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{
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if (logger.isInfoEnabled())
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{
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logger.info("reindexImpl started: " + this);
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}
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RetryingTransactionHelper retryingTransactionHelper = transactionService.getRetryingTransactionHelper();
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if (!started)
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{
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// Disable in-transaction indexing
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if (disableInTransactionIndexing && nodeIndexer != null)
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{
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logger.warn("In-transaction indexing is being disabled.");
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nodeIndexer.setEnabled(false);
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}
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// Make sure that we start clean
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voids.clear();
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previousTxnIds = new ArrayList<Long>(maxRecordSetSize);
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lastMaxTxnId = null; // So that it is ignored at first
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if (this.fromTxnId != 0L)
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{
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if (logger.isInfoEnabled())
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{
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logger.info("reindexImpl: start fromTxnId: " + fromTxnId);
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}
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Long fromTxnCommitTime = getTxnCommitTime(this.fromTxnId);
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if (fromTxnCommitTime == null)
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{
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return;
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}
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fromTimeInclusive = fromTxnCommitTime;
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}
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else
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{
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fromTimeInclusive = retryingTransactionHelper.doInTransaction(getStartingCommitTimeWork, true, true);
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}
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fromTxnId = 0L;
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started = true;
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if (logger.isInfoEnabled())
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{
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logger.info(
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"reindexImpl: start fromTimeInclusive: " +
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ISO8601DateFormat.format(new Date(fromTimeInclusive)));
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}
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}
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while (true)
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{
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Boolean repeat = retryingTransactionHelper.doInTransaction(reindexWork, true, true);
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// Only break out if there isn't any more work to do (for now)
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if (repeat == null || repeat.booleanValue() == false)
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{
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break;
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}
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}
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// Wait for the asynchronous reindexing to complete
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waitForAsynchronousReindexing();
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if (logger.isTraceEnabled())
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{
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logger.trace("reindexImpl: completed: "+this);
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}
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statusMsg = NO_REINDEX;
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}
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private Long getTxnCommitTime(final long txnId)
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{
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RetryingTransactionHelper retryingTransactionHelper = transactionService.getRetryingTransactionHelper();
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RetryingTransactionCallback<Long> getTxnCommitTimeWork = new RetryingTransactionCallback<Long>()
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{
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public Long execute() throws Exception
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{
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Transaction txn = nodeDaoService.getTxnById(txnId);
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if (txn != null)
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{
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return txn.getCommitTimeMs();
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}
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logger.warn("Txn not found: "+txnId);
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return null;
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}
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};
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return retryingTransactionHelper.doInTransaction(getTxnCommitTimeWork, true, true);
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}
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/**
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* @return Returns <tt>true</tt> if the reindex process can exit otherwise <tt>false</tt> if
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* a new transaction should be created and the process kicked off again
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*/
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private boolean reindexInTransaction()
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{
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List<Transaction> txns = null;
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long toTimeExclusive = System.currentTimeMillis() - reindexLagMs;
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// Check that the voids haven't been filled
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long minLiveVoidTime = checkVoids();
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if (minLiveVoidTime <= fromTimeInclusive)
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{
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// A void was discovered.
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// We need to adjust the search time for transactions, i.e. hop back in time but
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// this also entails a full build from that point on. So all previous transactions
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// need to be reindexed.
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fromTimeInclusive = minLiveVoidTime;
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previousTxnIds.clear();
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}
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// get next transactions to index
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txns = getNextTransactions(fromTimeInclusive, toTimeExclusive, previousTxnIds);
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// If there are no transactions, then all the work is done
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if (txns.size() == 0)
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{
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// We have caught up.
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// There is no need to force reindexing until the next unindex transactions appear.
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forceReindex = false;
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return false;
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}
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statusMsg = String.format(
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"Reindexing batch of %d transactions from %s (txnId=%s)",
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txns.size(),
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(new Date(fromTimeInclusive)).toString(),
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txns.isEmpty() ? "---" : txns.get(0).getId().toString());
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if (logger.isDebugEnabled())
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{
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logger.debug(statusMsg);
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}
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// Reindex the transactions. Voids between the last set of transactions and this
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// set will be detected as well. Additionally, the last max transaction will be
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// updated by this method.
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long maxProcessedTxnCommitTime = reindexTransactions(txns);
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// Call the listener
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synchronized (this)
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{
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if (listener != null)
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{
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listener.indexedTransactions(fromTimeInclusive, maxProcessedTxnCommitTime);
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}
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}
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// Move the time on.
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// The next fromTimeInclusive may well pull back transactions that have just been
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// processed. But we keep track of those and exclude them from the results.
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if (fromTimeInclusive == maxProcessedTxnCommitTime)
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{
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// The time didn't advance. If no new transaction appear, we could spin on
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// two or more transactions with the same commit time. So we DON'T clear
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// the list of previous transactions and we allow them to live on.
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}
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else
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{
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// The processing time has moved on
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fromTimeInclusive = maxProcessedTxnCommitTime;
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previousTxnIds.clear();
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}
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for (Transaction txn : txns)
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{
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previousTxnIds.add(txn.getId());
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}
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if (isShuttingDown() || (! started))
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{
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// break out if the VM is shutting down or tracker has been reset (ie. !started)
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return false;
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}
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else
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{
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// There is more work to do and we should be called back right away
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return true;
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}
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}
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public String getReindexStatus()
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{
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return statusMsg;
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}
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private static final long ONE_HOUR_MS = 3600*1000;
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/**
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* Find a transaction time to start indexing from (inclusive). The last recorded transaction by ID
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* is taken and the max transaction duration substracted from its commit time. A transaction is
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* retrieved for this time and checked for indexing. If it is present, then that value is chosen.
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* If not, a step back in time is taken again. This goes on until there are no more transactions
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* or a transaction is found in the index.
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*/
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protected long getStartingTxnCommitTime()
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{
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long now = System.currentTimeMillis();
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// Get the last indexed transaction for all transactions
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long lastIndexedAllCommitTimeMs = getLastIndexedCommitTime(now, false);
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// Now check back from this time to make sure there are no remote transactions that weren't indexed
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long lastIndexedRemoteCommitTimeMs = getLastIndexedCommitTime(now, true);
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// The one to start at is the least of the two times
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long startTime = Math.min(lastIndexedAllCommitTimeMs, lastIndexedRemoteCommitTimeMs);
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// Done
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return startTime;
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}
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/**
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* Gets the commit time for the last indexed transaction. If there are no transactions, then the
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* current time is returned.
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*
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* @param maxCommitTimeMs the largest commit time to consider
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* @param remoteOnly <tt>true</tt> to only look at remotely-committed transactions
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* @return Returns the last indexed transaction commit time for all or
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* remote-only transactions.
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*/
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private long getLastIndexedCommitTime(long maxCommitTimeMs, boolean remoteOnly)
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{
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// Look back in time by the maximum transaction duration
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long maxToTimeExclusive = maxCommitTimeMs - maxTxnDurationMs;
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long toTimeExclusive = maxToTimeExclusive;
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long fromTimeInclusive = 0L;
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double stepFactor = 1.0D;
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boolean firstWasInIndex = true;
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found:
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while (true)
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{
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// Get the most recent transaction before the given look-back
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List<Transaction> nextTransactions = nodeDaoService.getTxnsByCommitTimeDescending(
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0L,
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toTimeExclusive,
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1,
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null,
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remoteOnly);
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// There are no transactions in that time range
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if (nextTransactions.size() == 0)
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{
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break found;
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}
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// We found a transaction
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Transaction txn = nextTransactions.get(0);
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long txnCommitTime = txn.getCommitTimeMs();
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// Check that it is in the index
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InIndex txnInIndex = isTxnPresentInIndex(txn);
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switch (txnInIndex)
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{
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case YES:
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fromTimeInclusive = txnCommitTime;
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break found;
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default:
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firstWasInIndex = false;
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// Look further back in time. Step back by 60 seconds each time, increasing
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// the step by 10% each iteration.
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// Don't step back by more than a day
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long decrement = Math.min(ONE_HOUR_MS, (long) (60000.0D * stepFactor));
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toTimeExclusive = txnCommitTime - decrement;
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stepFactor *= 1.1D;
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continue;
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}
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}
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// If the last transaction (given the max txn duration) was in the index, then we used the
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// maximum commit time i.e. the indexes were up to date up until the most recent time.
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if (firstWasInIndex)
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{
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return maxToTimeExclusive;
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}
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else
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{
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return fromTimeInclusive;
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}
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}
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private static final int VOID_BATCH_SIZE = 100;
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/**
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* Voids - otherwise known as 'holes' - in the transaction sequence are timestamped when they are
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* discovered. This method discards voids that were timestamped before the given date. It checks
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* all remaining voids, passing back the transaction time for the newly-filled void. Otherwise
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* the value passed in is passed back.
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*
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* @return Returns an adjused start position based on any voids being filled
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* or <b>Long.MAX_VALUE</b> if no new voids were found
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*/
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private long checkVoids()
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{
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long maxHistoricalTime = (fromTimeInclusive - maxTxnDurationMs);
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long fromTimeAdjusted = Long.MAX_VALUE;
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List<Long> toExpireTxnIds = new ArrayList<Long>(1);
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Iterator<Long> voidTxnIdIterator = voids.keySet().iterator();
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List<Long> voidTxnIdBatch = new ArrayList<Long>(VOID_BATCH_SIZE);
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while (voidTxnIdIterator.hasNext())
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{
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Long voidTxnId = voidTxnIdIterator.next();
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// Add it to the batch
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voidTxnIdBatch.add(voidTxnId);
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// If the batch is full or if there are no more voids, fire the query
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if (voidTxnIdBatch.size() == VOID_BATCH_SIZE || !voidTxnIdIterator.hasNext())
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{
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List<Transaction> filledTxns = nodeDaoService.getTxnsByMinCommitTime(voidTxnIdBatch);
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for (Transaction txn : filledTxns)
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{
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if (txn.getCommitTimeMs() == null) // Just coping with Hibernate mysteries
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{
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continue;
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}
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else if (isTxnPresentInIndex(txn) != InIndex.NO)
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{
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// It is in the index so expire it from the voids.
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// This can happen if void was committed locally.
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toExpireTxnIds.add(txn.getId());
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}
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else
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{
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// It's not in the index so we have a timespamp from which to kick off
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// It is a bone fide first transaction. A void has been filled.
|
|
long txnCommitTimeMs = txn.getCommitTimeMs().longValue();
|
|
// If the value is lower than our current one we keep it
|
|
if (txnCommitTimeMs < fromTimeAdjusted)
|
|
{
|
|
fromTimeAdjusted = txnCommitTimeMs;
|
|
}
|
|
// The query selected them in timestamp order so there is no need to process
|
|
// the remaining transactions in this batch - we have our minimum.
|
|
break;
|
|
}
|
|
}
|
|
// Wipe the batch clean
|
|
voidTxnIdBatch.clear();
|
|
}
|
|
// Check if the void must be expired or not
|
|
TxnRecord voidTxnRecord = voids.get(voidTxnId);
|
|
if (voidTxnRecord.txnCommitTime < maxHistoricalTime)
|
|
{
|
|
// It's too late for this void whether or not it has become live
|
|
toExpireTxnIds.add(voidTxnId);
|
|
}
|
|
}
|
|
// Throw away all the expired or removable voids
|
|
int voidCountBefore = voids.size();
|
|
for (Long toRemoveTxnId : toExpireTxnIds)
|
|
{
|
|
voids.remove(toRemoveTxnId);
|
|
}
|
|
int voidCountAfter = voids.size();
|
|
if (logger.isDebugEnabled() && voidCountBefore != voidCountAfter)
|
|
{
|
|
logger.debug("Void count " + voidCountBefore + " -> " + voidCountAfter);
|
|
}
|
|
// Done
|
|
if (logger.isDebugEnabled() && fromTimeAdjusted < Long.MAX_VALUE)
|
|
{
|
|
logger.debug("Returning to void time " + fromTimeAdjusted);
|
|
}
|
|
return fromTimeAdjusted;
|
|
}
|
|
|
|
private List<Transaction> getNextTransactions(long fromTimeInclusive, long toTimeExclusive, List<Long> previousTxnIds)
|
|
{
|
|
List<Transaction> txns = nodeDaoService.getTxnsByCommitTimeAscending(
|
|
fromTimeInclusive,
|
|
toTimeExclusive,
|
|
maxRecordSetSize,
|
|
previousTxnIds,
|
|
false);
|
|
// done
|
|
return txns;
|
|
}
|
|
|
|
/**
|
|
* Checks that each of the transactions is present in the index. As soon as one is found that
|
|
* isn't, all the following transactions will be reindexed. After the reindexing, the sequence
|
|
* of transaction IDs will be examined for any voids. These will be recorded.
|
|
*
|
|
* @param txns transactions ordered by time ascending
|
|
* @return returns the commit time of the last transaction in the list
|
|
* @throws IllegalArgumentException if there are no transactions
|
|
*/
|
|
private long reindexTransactions(List<Transaction> txns)
|
|
{
|
|
if (txns.isEmpty())
|
|
{
|
|
throw new IllegalArgumentException("There are no transactions to process");
|
|
}
|
|
|
|
// Determines the window for void retention
|
|
long now = System.currentTimeMillis();
|
|
long oldestVoidRetentionTime = (now - maxTxnDurationMs);
|
|
|
|
// Keep an ordered map of IDs that we process along with their commit times
|
|
Map<Long, TxnRecord> processedTxnRecords = new TreeMap<Long, TxnRecord>();
|
|
|
|
List<Long> txnIdBuffer = new ArrayList<Long>(maxTransactionsPerLuceneCommit);
|
|
Iterator<Transaction> txnIterator = txns.iterator();
|
|
while (txnIterator.hasNext())
|
|
{
|
|
Transaction txn = txnIterator.next();
|
|
Long txnId = txn.getId();
|
|
Long txnCommitTimeMs = txn.getCommitTimeMs();
|
|
if (txnCommitTimeMs == null)
|
|
{
|
|
// What? But let's be cautious and treat this as a void
|
|
continue;
|
|
}
|
|
// Keep a record of it
|
|
TxnRecord processedTxnRecord = new TxnRecord();
|
|
processedTxnRecord.txnCommitTime = txnCommitTimeMs;
|
|
processedTxnRecords.put(txnId, processedTxnRecord);
|
|
// Remove this entry from the void list - it is not void
|
|
voids.remove(txnId);
|
|
|
|
// Reindex the transaction if we are forcing it or if it isn't in the index already
|
|
if (forceReindex || isTxnPresentInIndex(txn) == InIndex.NO)
|
|
{
|
|
// From this point on, until the tracker has caught up, all transactions need to be indexed
|
|
forceReindex = true;
|
|
// Add the transaction to the buffer of transactions that need processing
|
|
txnIdBuffer.add(txnId);
|
|
if (logger.isDebugEnabled())
|
|
{
|
|
logger.debug("Reindexing transaction: " + txn);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (logger.isDebugEnabled())
|
|
{
|
|
logger.debug("Reindex skipping transaction: " + txn);
|
|
}
|
|
}
|
|
|
|
if (isShuttingDown() || (! started))
|
|
{
|
|
// break out if the VM is shutting down or tracker has been reset (ie. !started)
|
|
break;
|
|
}
|
|
// Flush the reindex buffer, if it is full or if we are on the last transaction and there are no more
|
|
if (txnIdBuffer.size() >= maxTransactionsPerLuceneCommit || (!txnIterator.hasNext() && txnIdBuffer.size() > 0))
|
|
{
|
|
try
|
|
{
|
|
// We try the reindex, but for the sake of continuity, have to let it run on
|
|
reindexTransactionAsynchronously(txnIdBuffer);
|
|
}
|
|
catch (Throwable e)
|
|
{
|
|
logger.warn("\n" +
|
|
"Reindex of transactions failed: \n" +
|
|
" Transaction IDs: " + txnIdBuffer + "\n" +
|
|
" Error: " + e.getMessage(),
|
|
e);
|
|
}
|
|
// Clear the buffer
|
|
txnIdBuffer = new ArrayList<Long>(maxTransactionsPerLuceneCommit);
|
|
}
|
|
}
|
|
// Use the last ID from the previous iteration as our starting point
|
|
Long lastId = lastMaxTxnId;
|
|
long lastCommitTime = -1L;
|
|
// Walk the processed txn IDs
|
|
for (Map.Entry<Long, TxnRecord> entry : processedTxnRecords.entrySet())
|
|
{
|
|
Long processedTxnId = entry.getKey();
|
|
TxnRecord processedTxnRecord = entry.getValue();
|
|
boolean voidsAreYoungEnough = processedTxnRecord.txnCommitTime >= oldestVoidRetentionTime;
|
|
if (lastId != null && voidsAreYoungEnough)
|
|
{
|
|
int voidCount = 0;
|
|
// Iterate BETWEEN the last ID and the current one to find voids
|
|
// Only enter the loop if the current upper limit transaction is young enough to
|
|
// consider for voids.
|
|
for (long i = lastId.longValue() + 1; i < processedTxnId; i++)
|
|
{
|
|
// The voids are optimistically given the same transaction time as transaction with the
|
|
// largest ID. We only bother w
|
|
TxnRecord voidRecord = new TxnRecord();
|
|
voidRecord.txnCommitTime = processedTxnRecord.txnCommitTime;
|
|
voids.put(new Long(i), voidRecord);
|
|
voidCount++;
|
|
}
|
|
if (logger.isDebugEnabled()&& voidCount > 0)
|
|
{
|
|
logger.debug("Voids detected: " + voidCount + " in range [" + lastId + ", " + processedTxnId + "]");
|
|
}
|
|
}
|
|
lastId = processedTxnId;
|
|
lastCommitTime = processedTxnRecord.txnCommitTime;
|
|
}
|
|
// Having searched for the nodes, we've recorded all the voids. So move the lastMaxTxnId up.
|
|
lastMaxTxnId = lastId;
|
|
|
|
// Done
|
|
return lastCommitTime;
|
|
}
|
|
|
|
private class TxnRecord
|
|
{
|
|
private long txnCommitTime;
|
|
@Override
|
|
public String toString()
|
|
{
|
|
StringBuilder sb = new StringBuilder(128);
|
|
sb.append("TxnRecord")
|
|
.append("[time=").append(txnCommitTime <= 0 ? "---" : new Date(txnCommitTime))
|
|
.append("]");
|
|
return sb.toString();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* A callback that can be set to provide logging and other record keeping
|
|
*
|
|
* @author Derek Hulley
|
|
* @since 2.1.4
|
|
*/
|
|
public interface IndexTransactionTrackerListener
|
|
{
|
|
void indexedTransactions(long fromTimeInclusive, long toTimeExclusive);
|
|
}
|
|
} |