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IndexerReducer.java
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Thu, Nov 7, 17:10

IndexerReducer.java
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/*
* Warcbase: an open-source platform for managing web archives
*
* Licensed 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.warcbase.index;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.MapReduceBase;
import org.apache.hadoop.mapred.OutputCollector;
import org.apache.hadoop.mapred.Reducer;
import org.apache.hadoop.mapred.Reporter;
import org.apache.solr.client.solrj.SolrServer;
import org.apache.solr.client.solrj.embedded.EmbeddedSolrServer;
import org.apache.solr.client.solrj.response.UpdateResponse;
import org.apache.solr.common.SolrInputDocument;
import org.apache.solr.core.CoreContainer;
import org.apache.solr.core.HdfsDirectoryFactory;
import uk.bl.wa.apache.solr.hadoop.Solate;
import uk.bl.wa.hadoop.indexer.WritableSolrRecord;
import uk.bl.wa.solr.SolrRecord;
public class IndexerReducer extends MapReduceBase implements
Reducer<IntWritable, WritableSolrRecord, Text, Text> {
public static final String HDFS_OUTPUT_PATH = "IndexerReducer.HDFSOutputPath";
private static final Log LOG = LogFactory.getLog(IndexerReducer.class);
private static final int SUBMISSION_PAUSE_MINS = 5;
private static final String SHARD_PREFIX = "shard";
private SolrServer solrServer;
private int batchSize = 1000;
private List<SolrInputDocument> docs = new ArrayList<SolrInputDocument>();
private int numberOfSequentialFails = 0;
private FileSystem fs;
private Path solrHome;
private Path outputDir;
static enum MyCounters {
NUM_RECORDS, NUM_ERRORS, NUM_DROPPED_RECORDS
}
@Override
public void configure(JobConf job) {
LOG.info("Configuring reducer...");
// Initialize the embedded server.
try {
job.setBoolean("fs.hdfs.impl.disable.cache", true);
fs = FileSystem.get(job);
solrHome = Solate.findSolrConfig(job, IndexerRunner.solrHomeZipName);
LOG.info("Found solrHomeDir " + solrHome);
} catch (IOException e) {
e.printStackTrace();
LOG.error("FAILED in reducer configuration: " + e);
}
outputDir = new Path(job.get(HDFS_OUTPUT_PATH));
LOG.info("HDFS index output path: " + outputDir);
LOG.info("Initialization complete.");
}
private void initEmbeddedServer(int slice) throws IOException {
if (solrHome == null) {
throw new IOException("Unable to find solr home setting");
}
Path outputShardDir = new Path(fs.getHomeDirectory() + "/" + outputDir, SHARD_PREFIX + slice);
LOG.info("Creating embedded Solr server with solrHomeDir: " + solrHome + ", fs: " + fs
+ ", outputShardDir: " + outputShardDir);
Path solrDataDir = new Path(outputShardDir, "data");
if (!fs.exists(solrDataDir) && !fs.mkdirs(solrDataDir)) {
throw new IOException("Unable to create " + solrDataDir);
}
String dataDirStr = solrDataDir.toUri().toString();
LOG.info("Attempting to set data dir to: " + dataDirStr);
System.setProperty("solr.data.dir", dataDirStr);
System.setProperty("solr.home", solrHome.toString());
System.setProperty("solr.solr.home", solrHome.toString());
System.setProperty("solr.hdfs.home", outputDir.toString());
System.setProperty("solr.directoryFactory", HdfsDirectoryFactory.class.getName());
System.setProperty("solr.lock.type", "hdfs");
System.setProperty("solr.hdfs.nrtcachingdirectory", "false");
System.setProperty("solr.hdfs.blockcache.enabled", "true");
System.setProperty("solr.hdfs.blockcache.write.enabled", "false");
System.setProperty("solr.autoCommit.maxTime", "600000");
System.setProperty("solr.autoSoftCommit.maxTime", "-1");
LOG.info("Loading the container...");
CoreContainer container = new CoreContainer();
container.load();
for (String s : container.getAllCoreNames()) {
LOG.warn("Got core name: " + s);
}
String coreName = "";
if (container.getCoreNames().size() > 0) {
coreName = container.getCoreNames().iterator().next();
}
LOG.error("Now firing up the server...");
solrServer = new EmbeddedSolrServer(container, coreName);
LOG.error("Server started successfully!");
}
@Override
public void reduce(IntWritable key, Iterator<WritableSolrRecord> values,
OutputCollector<Text, Text> output, Reporter reporter) throws IOException {
SolrRecord solr;
// Get the shard number, but counting from 1 instead of 0:
int shard = key.get() + 1;
// For indexing into HDFS, set up a new server per key:
initEmbeddedServer(shard);
// Go through the documents for this shard:
long cnt = 0;
while (values.hasNext()) {
solr = values.next().getSolrRecord();
cnt++;
docs.add(solr.getSolrDocument());
// Have we exceeded the batchSize?
checkSubmission(docs, batchSize, reporter);
// Occasionally update application-level status:
if ((cnt % 1000) == 0) {
reporter.setStatus(SHARD_PREFIX + shard + ": processed " + cnt + ", dropped "
+ reporter.getCounter(MyCounters.NUM_DROPPED_RECORDS).getValue());
}
}
try {
// If we have at least one document unsubmitted, make sure we submit it.
checkSubmission(docs, 1, reporter);
// If we are indexing to HDFS, shut the shard down:
// Commit, and block until the changes have been flushed.
solrServer.commit(true, false);
solrServer.shutdown();
} catch (Exception e) {
LOG.error("ERROR on commit: " + e);
e.printStackTrace();
}
}
@Override
public void close() {}
private void checkSubmission(List<SolrInputDocument> docs, int limit, Reporter reporter) {
if (docs.size() > 0 && docs.size() >= limit) {
try {
// Inform that there is progress (still-alive):
reporter.progress();
UpdateResponse response = solrServer.add(docs);
LOG.info("Submitted " + docs.size() + " docs [" + response.getStatus() + "]");
reporter.incrCounter(MyCounters.NUM_RECORDS, docs.size());
docs.clear();
numberOfSequentialFails = 0;
} catch (Exception e) {
// Count up repeated fails:
numberOfSequentialFails++;
// If there have been a lot of fails, drop the records (we have seen some
// "Invalid UTF-8 character 0xfffe at char" so this avoids bad data blocking job completion)
if (this.numberOfSequentialFails >= 3) {
LOG.error("Submission has repeatedly failed - assuming bad data and dropping these " + docs.size() + " records.");
reporter.incrCounter(MyCounters.NUM_DROPPED_RECORDS, docs.size());
docs.clear();
}
// SOLR-5719 possibly hitting us here; CloudSolrServer.RouteException
LOG.error("Sleeping for " + SUBMISSION_PAUSE_MINS + " minute(s): " + e.getMessage(), e);
// Also add a report for this condition.
reporter.incrCounter(MyCounters.NUM_ERRORS, 1);
try {
Thread.sleep(1000 * 60 * SUBMISSION_PAUSE_MINS);
} catch (InterruptedException ex) {
LOG.warn("Sleep between Solr submissions was interrupted!");
}
}
}
}
}

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