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/**
* eobjects.org AnalyzerBeans
* Copyright (C) 2010 eobjects.org
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* 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 Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.eobjects.analyzer.cluster;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import org.eobjects.analyzer.beans.filter.MaxRowsFilter;
import org.eobjects.analyzer.beans.filter.MaxRowsFilter.Category;
import org.eobjects.analyzer.cluster.virtual.VirtualClusterManager;
import org.eobjects.analyzer.configuration.AnalyzerBeansConfiguration;
import org.eobjects.analyzer.configuration.InjectionManager;
import org.eobjects.analyzer.data.InputColumn;
import org.eobjects.analyzer.data.MetaModelInputColumn;
import org.eobjects.analyzer.descriptors.BeanDescriptor;
import org.eobjects.analyzer.descriptors.ComponentDescriptor;
import org.eobjects.analyzer.job.AnalysisJob;
import org.eobjects.analyzer.job.ComponentJob;
import org.eobjects.analyzer.job.builder.AnalysisJobBuilder;
import org.eobjects.analyzer.job.builder.FilterJobBuilder;
import org.eobjects.analyzer.job.concurrent.SingleThreadedTaskRunner;
import org.eobjects.analyzer.job.concurrent.TaskListener;
import org.eobjects.analyzer.job.runner.AnalysisJobMetrics;
import org.eobjects.analyzer.job.runner.AnalysisListener;
import org.eobjects.analyzer.job.runner.AnalysisResultFuture;
import org.eobjects.analyzer.job.runner.AnalysisRunner;
import org.eobjects.analyzer.job.runner.CompositeAnalysisListener;
import org.eobjects.analyzer.job.runner.RowProcessingMetrics;
import org.eobjects.analyzer.job.runner.RowProcessingPublisher;
import org.eobjects.analyzer.job.runner.RowProcessingPublishers;
import org.eobjects.analyzer.job.tasks.Task;
import org.eobjects.analyzer.lifecycle.LifeCycleHelper;
import org.eobjects.analyzer.util.SourceColumnFinder;
import org.eobjects.analyzer.util.StringUtils;
import org.apache.metamodel.schema.Column;
import org.apache.metamodel.schema.Table;
import org.apache.metamodel.util.SharedExecutorService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* An {@link AnalysisRunner} which executes {@link AnalysisJob}s accross a
* distributed set of slave nodes.
*/
public final class DistributedAnalysisRunner implements AnalysisRunner {
private static final Logger logger = LoggerFactory.getLogger(DistributedAnalysisRunner.class);
private final ClusterManager _clusterManager;
private final AnalyzerBeansConfiguration _configuration;
private final CompositeAnalysisListener _analysisListener;
public DistributedAnalysisRunner(AnalyzerBeansConfiguration configuration, ClusterManager clusterManager) {
this(configuration, clusterManager, new AnalysisListener[0]);
}
public DistributedAnalysisRunner(AnalyzerBeansConfiguration configuration, ClusterManager clusterManager,
AnalysisListener... listeners) {
_configuration = configuration;
_clusterManager = clusterManager;
_analysisListener = new CompositeAnalysisListener(listeners);
}
/**
* Determines if an {@link AnalysisJob} is distributable or not. If this
* method returns false, calling {@link #run(AnalysisJob)} with the job will
* typically throw a {@link UnsupportedOperationException}.
*
* @param job
* @return
*/
public boolean isDistributable(final AnalysisJob job) {
try {
failIfJobIsUnsupported(job);
return true;
} catch (Throwable e) {
return false;
}
}
/**
* {@inheritDoc}
*
* @throws UnsupportedOperationException
* if the job is not distributable (either because components
* are not distributable in their nature, or because some
* features are limited).
*/
@Override
public AnalysisResultFuture run(final AnalysisJob job) throws UnsupportedOperationException {
logger.info("Validating distributed job: {}", job);
failIfJobIsUnsupported(job);
final InjectionManager injectionManager = _configuration.getInjectionManager(job);
final LifeCycleHelper lifeCycleHelper = new LifeCycleHelper(injectionManager, true);
final RowProcessingPublishers publishers = getRowProcessingPublishers(job, lifeCycleHelper);
final RowProcessingPublisher publisher = getRowProcessingPublisher(publishers);
publisher.initializeConsumers(new TaskListener() {
@Override
public void onError(Task task, Throwable throwable) {
logger.error("Failed to initialize consumers at master node!", throwable);
}
@Override
public void onComplete(Task task) {
}
@Override
public void onBegin(Task task) {
}
});
logger.info("Validation passed! Chunking job for distribution amongst slaves: {}", job);
// since we always use a SingleThreadedTaskRunner, the above operation
// will be synchronized/blocking.
final AnalysisJobMetrics analysisJobMetrics = publishers.getAnalysisJobMetrics();
_analysisListener.jobBegin(job, analysisJobMetrics);
final RowProcessingMetrics rowProcessingMetrics = publisher.getRowProcessingMetrics();
_analysisListener.rowProcessingBegin(job, rowProcessingMetrics);
final AnalysisResultFuture resultFuture;
try {
final int expectedRows = rowProcessingMetrics.getExpectedRows();
if (expectedRows == 0) {
logger.info("Expected rows of the job was zero. Job will run on a local virtual slave.");
// when there are no expected rows we still need to build a
// single slave job, but run it locally, since the job lifecycle
// still needs to be guaranteed.
final DistributedJobContext context = new DistributedJobContextImpl(_configuration, job, 0, 1);
// use a virtual cluster, which just runs the job locally.
final VirtualClusterManager localCluster = new VirtualClusterManager(_configuration, 1);
resultFuture = localCluster.dispatchJob(job, context);
} else {
final JobDivisionManager jobDivisionManager = _clusterManager.getJobDivisionManager();
final int chunks = jobDivisionManager.calculateDivisionCount(job, expectedRows);
final int rowsPerChunk = (expectedRows + 1) / chunks;
logger.info(
"Expected rows was {}. A total number of {} slave jobs will be built, each of approx. {} rows.",
expectedRows, chunks, rowsPerChunk);
final List results = dispatchJobs(job, chunks, rowsPerChunk, publisher);
final DistributedAnalysisResultReducer reducer = new DistributedAnalysisResultReducer(job,
lifeCycleHelper, publisher, _analysisListener);
resultFuture = new DistributedAnalysisResultFuture(results, reducer);
}
} catch (RuntimeException e) {
_analysisListener.errorUknown(job, e);
throw e;
}
if (!_analysisListener.isEmpty()) {
awaitAndInformListener(job, analysisJobMetrics, rowProcessingMetrics, resultFuture);
}
return resultFuture;
}
/**
* Spawns a new thread for awaiting the result future (which will force the
* reducer to inform about the progress).
*
* @param job
* @param analysisJobMetrics
* @param resultFuture
*/
private void awaitAndInformListener(final AnalysisJob job, final AnalysisJobMetrics analysisJobMetrics,
final RowProcessingMetrics rowProcessingMetrics, final AnalysisResultFuture resultFuture) {
SharedExecutorService.get().execute(new Runnable() {
@Override
public void run() {
resultFuture.await();
if (resultFuture.isSuccessful()) {
_analysisListener.jobSuccess(job, analysisJobMetrics);
}
}
});
}
public List dispatchJobs(final AnalysisJob job, final int chunks, final int rowsPerChunk,
final RowProcessingPublisher publisher) {
final List results = new ArrayList();
for (int i = 0; i < chunks; i++) {
final int firstRow = (i * rowsPerChunk) + 1;
final int maxRows;
if (i == chunks - 1) {
maxRows = Integer.MAX_VALUE - firstRow - 1;
} else {
maxRows = rowsPerChunk;
}
final AnalysisJob slaveJob = buildSlaveJob(job, i, firstRow, maxRows);
final DistributedJobContext context = new DistributedJobContextImpl(_configuration, job, i, chunks);
try {
logger.info("Dispatching slave job {} of {}", i + 1, chunks);
final AnalysisResultFuture slaveResultFuture = _clusterManager.dispatchJob(slaveJob, context);
results.add(slaveResultFuture);
} catch (Exception e) {
_analysisListener.errorUknown(job, e);
// exceptions due to dispatching jobs are added as the first of
// the job's errors, and the rest of the execution is aborted.
AnalysisResultFuture errorResult = new FailedAnalysisResultFuture(e);
results.add(0, errorResult);
break;
}
}
return results;
}
/**
* Creates a slave job by copying the original job and adding a
* {@link MaxRowsFilter} as a default requirement.
*
* @param job
* @param firstRow
* @param maxRows
* @return
*/
private AnalysisJob buildSlaveJob(AnalysisJob job, int slaveJobIndex, int firstRow, int maxRows) {
logger.info("Building slave job {} with firstRow={} and maxRow={}", slaveJobIndex + 1, firstRow, maxRows);
try (final AnalysisJobBuilder jobBuilder = new AnalysisJobBuilder(_configuration, job)) {
final FilterJobBuilder maxRowsFilter = jobBuilder.addFilter(MaxRowsFilter.class);
maxRowsFilter.getConfigurableBean().setFirstRow(firstRow);
maxRowsFilter.getConfigurableBean().setMaxRows(maxRows);
final boolean naturalRecordOrderConsistent = jobBuilder.getDatastore().getPerformanceCharacteristics()
.isNaturalRecordOrderConsistent();
if (!naturalRecordOrderConsistent) {
final InputColumn orderColumn = findOrderByColumn(jobBuilder);
maxRowsFilter.getConfigurableBean().setOrderColumn(orderColumn);
}
jobBuilder.setDefaultRequirement(maxRowsFilter, MaxRowsFilter.Category.VALID);
// in assertion/test mode do an early validation
assert jobBuilder.isConfigured(true);
return jobBuilder.toAnalysisJob();
}
}
/**
* Finds a source column which is appropriate for an ORDER BY clause in the
* generated paginated queries
*
* @param jobBuilder
* @return
*/
private InputColumn findOrderByColumn(AnalysisJobBuilder jobBuilder) {
final Table sourceTable = jobBuilder.getSourceTables().get(0);
// preferred strategy: Use the primary key
final Column[] primaryKeys = sourceTable.getPrimaryKeys();
if (primaryKeys.length == 1) {
final Column primaryKey = primaryKeys[0];
final InputColumn sourceColumn = jobBuilder.getSourceColumnByName(primaryKey.getName());
if (sourceColumn == null) {
jobBuilder.addSourceColumn(primaryKey);
logger.info("Added PK source column for ORDER BY clause on slave jobs: {}", sourceColumn);
return jobBuilder.getSourceColumnByName(primaryKey.getName());
} else {
logger.info("Using existing PK source column for ORDER BY clause on slave jobs: {}", sourceColumn);
return sourceColumn;
}
} else {
if (logger.isDebugEnabled()) {
logger.debug("Found {} primary keys, cannot select a single for ORDER BY clause on slave jobs: {}",
primaryKeys.length, Arrays.toString(primaryKeys));
}
}
// secondary strategy: See if there's a source column called something
// like 'ID' or so, and use that.
final List sourceColumns = jobBuilder.getSourceColumns();
final String tableName = sourceTable.getName().toLowerCase();
for (final MetaModelInputColumn sourceColumn : sourceColumns) {
String name = sourceColumn.getName();
if (name != null) {
name = StringUtils.replaceWhitespaces(name, "");
name = StringUtils.replaceAll(name, "_", "");
name = StringUtils.replaceAll(name, "-", "");
name = name.toLowerCase();
if ("id".equals(name) || (tableName + "id").equals(name) || (tableName + "number").equals(name)
|| (tableName + "key").equals(name)) {
logger.info("Using existing source column for ORDER BY clause on slave jobs: {}", sourceColumn);
return sourceColumn;
}
}
}
// last resort: Pick any source column and sort on that (might not work
// if the column contains a lot of repeated values)
final MetaModelInputColumn sourceColumn = sourceColumns.get(0);
logger.warn(
"Couldn't pick a good source column for ORDER BY clause on slave jobs. Picking the first column: {}",
sourceColumn);
return sourceColumn;
}
private RowProcessingPublishers getRowProcessingPublishers(AnalysisJob job, LifeCycleHelper lifeCycleHelper) {
final SourceColumnFinder sourceColumnFinder = new SourceColumnFinder();
sourceColumnFinder.addSources(job);
final SingleThreadedTaskRunner taskRunner = new SingleThreadedTaskRunner();
final RowProcessingPublishers publishers = new RowProcessingPublishers(job, null, taskRunner, lifeCycleHelper,
sourceColumnFinder);
return publishers;
}
private RowProcessingPublisher getRowProcessingPublisher(RowProcessingPublishers publishers) {
final Table[] tables = publishers.getTables();
if (tables.length != 1) {
throw new UnsupportedOperationException("Jobs with multiple source tables are not distributable");
}
final Table table = tables[0];
final RowProcessingPublisher publisher = publishers.getRowProcessingPublisher(table);
return publisher;
}
private void failIfJobIsUnsupported(AnalysisJob job) throws UnsupportedOperationException {
failIfComponentsAreUnsupported(job.getFilterJobs());
failIfComponentsAreUnsupported(job.getTransformerJobs());
failIfComponentsAreUnsupported(job.getAnalyzerJobs());
}
private void failIfComponentsAreUnsupported(Collection jobs)
throws UnsupportedOperationException {
for (ComponentJob job : jobs) {
final ComponentDescriptor descriptor = job.getDescriptor();
if (descriptor instanceof BeanDescriptor) {
final BeanDescriptor beanDescriptor = (BeanDescriptor) descriptor;
final boolean distributable = beanDescriptor.isDistributable();
if (!distributable) {
throw new UnsupportedOperationException("Component is not distributable: " + job);
}
} else {
throw new UnsupportedOperationException("Unsupported component type: " + descriptor);
}
}
}
}
