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/**
* Licensed to DigitalPebble Ltd under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* DigitalPebble 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 com.digitalpebble.stormcrawler.elasticsearch.persistence;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Collections;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.apache.commons.lang.StringUtils;
import org.apache.storm.spout.SpoutOutputCollector;
import org.apache.storm.task.TopologyContext;
import org.apache.storm.tuple.Values;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.search.SearchRequestBuilder;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.action.search.SearchType;
import org.elasticsearch.index.query.QueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.Aggregations;
import org.elasticsearch.search.aggregations.bucket.SingleBucketAggregation;
import org.elasticsearch.search.aggregations.bucket.sampler.DiversifiedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.aggregations.metrics.min.MinAggregationBuilder;
import org.elasticsearch.search.aggregations.metrics.tophits.TopHits;
import org.elasticsearch.search.aggregations.metrics.tophits.TopHitsAggregationBuilder;
import org.elasticsearch.search.sort.FieldSortBuilder;
import org.elasticsearch.search.sort.SortBuilders;
import org.elasticsearch.search.sort.SortOrder;
import org.joda.time.format.ISODateTimeFormat;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.digitalpebble.stormcrawler.Metadata;
import com.digitalpebble.stormcrawler.util.ConfUtils;
/**
* Spout which pulls URL from an ES index. Use a single instance unless you use
* 'es.status.routing' with the StatusUpdaterBolt, in which case you need to
* have exactly the same number of spout instances as ES shards. Guarantees a
* good mix of URLs by aggregating them by an arbitrary field e.g.
* metadata.hostname.
**/
@SuppressWarnings("serial")
public class AggregationSpout extends AbstractSpout implements
ActionListener {
private static final Logger LOG = LoggerFactory
.getLogger(AggregationSpout.class);
private static final String ESStatusSampleParamName = "es.status.sample";
private static final String ESMostRecentDateIncreaseParamName = "es.status.recentDate.increase";
private static final String ESMostRecentDateMinGapParamName = "es.status.recentDate.min.gap";
private boolean sample = false;
private int recentDateIncrease = -1;
private int recentDateMinGap = -1;
@Override
public void open(Map stormConf, TopologyContext context,
SpoutOutputCollector collector) {
sample = ConfUtils.getBoolean(stormConf, ESStatusSampleParamName,
sample);
recentDateIncrease = ConfUtils.getInt(stormConf,
ESMostRecentDateIncreaseParamName, recentDateIncrease);
recentDateMinGap = ConfUtils.getInt(stormConf,
ESMostRecentDateMinGapParamName, recentDateMinGap);
super.open(stormConf, context, collector);
}
@Override
protected void populateBuffer() {
if (lastDate == null) {
lastDate = new Date();
}
String formattedLastDate = ISODateTimeFormat.dateTimeNoMillis().print(
lastDate.getTime());
LOG.info("{} Populating buffer with nextFetchDate <= {}", logIdprefix,
formattedLastDate);
QueryBuilder rangeQueryBuilder = QueryBuilders.rangeQuery(
"nextFetchDate").lte(formattedLastDate);
SearchRequestBuilder srb = client.prepareSearch(indexName)
.setTypes(docType).setSearchType(SearchType.QUERY_THEN_FETCH)
.setQuery(rangeQueryBuilder).setFrom(0).setSize(0)
.setExplain(false);
TermsAggregationBuilder aggregations = AggregationBuilders
.terms("partition").field(partitionField).size(maxBucketNum);
TopHitsAggregationBuilder tophits = AggregationBuilders.topHits("docs")
.size(maxURLsPerBucket).explain(false);
// sort within a bucket
if (StringUtils.isNotBlank(bucketSortField)) {
FieldSortBuilder sorter = SortBuilders.fieldSort(bucketSortField)
.order(SortOrder.ASC);
tophits.sort(sorter);
}
aggregations.subAggregation(tophits);
// sort between buckets
if (StringUtils.isNotBlank(totalSortField)) {
MinAggregationBuilder minBuilder = AggregationBuilders.min(
"top_hit").field(totalSortField);
aggregations.subAggregation(minBuilder);
aggregations.order(Terms.Order.aggregation("top_hit", true));
}
if (sample) {
DiversifiedAggregationBuilder sab = new DiversifiedAggregationBuilder(
"sample");
sab.field(partitionField).maxDocsPerValue(maxURLsPerBucket);
sab.shardSize(maxURLsPerBucket * maxBucketNum);
sab.subAggregation(aggregations);
srb.addAggregation(sab);
} else {
srb.addAggregation(aggregations);
}
// https://www.elastic.co/guide/en/elasticsearch/reference/current/search-request-preference.html
// _shards:2,3
if (shardID != -1) {
srb.setPreference("_shards:" + shardID);
}
// dump query to log
LOG.debug("{} ES query {}", logIdprefix, srb.toString());
timeStartESQuery = System.currentTimeMillis();
isInESQuery.set(true);
srb.execute(this);
}
@Override
public void onFailure(Exception arg0) {
LOG.error("Exception with ES query", arg0);
isInESQuery.set(false);
}
@Override
public void onResponse(SearchResponse response) {
long timeTaken = System.currentTimeMillis() - timeStartESQuery;
Aggregations aggregs = response.getAggregations();
SingleBucketAggregation sample = aggregs.get("sample");
if (sample != null) {
aggregs = sample.getAggregations();
}
Terms agg = aggregs.get("partition");
int numhits = 0;
int numBuckets = 0;
int alreadyprocessed = 0;
Date mostRecentDateFound = null;
SimpleDateFormat formatter = new SimpleDateFormat(
"yyyy-MM-dd'T'HH:mm:ss.SSSX");
synchronized (buffer) {
// For each entry
Iterator iterator = agg.getBuckets().iterator();
while (iterator.hasNext()) {
Terms.Bucket entry = iterator.next();
String key = (String) entry.getKey(); // bucket key
long docCount = entry.getDocCount(); // Doc count
int hitsForThisBucket = 0;
// filter results so that we don't include URLs we are already
// being processed
TopHits topHits = entry.getAggregations().get("docs");
for (SearchHit hit : topHits.getHits().getHits()) {
hitsForThisBucket++;
Map keyValues = hit.sourceAsMap();
String url = (String) keyValues.get("url");
LOG.debug("{} -> id [{}], _source [{}]", logIdprefix,
hit.getId(), hit.getSourceAsString());
// consider only the first document of the last bucket
// for optimising the nextFetchDate
if (hitsForThisBucket == 1 && !iterator.hasNext()) {
String strDate = (String) keyValues
.get("nextFetchDate");
try {
mostRecentDateFound = formatter.parse(strDate);
} catch (ParseException e) {
throw new RuntimeException("can't parse date :"
+ strDate);
}
}
// is already being processed - skip it!
if (beingProcessed.containsKey(url)) {
alreadyprocessed++;
continue;
}
Metadata metadata = fromKeyValues(keyValues);
buffer.add(new Values(url, metadata));
}
if (hitsForThisBucket > 0)
numBuckets++;
numhits += hitsForThisBucket;
LOG.debug("{} key [{}], hits[{}], doc_count [{}]", logIdprefix,
key, hitsForThisBucket, docCount, alreadyprocessed);
}
// Shuffle the URLs so that we don't get blocks of URLs from the
// same
// host or domain
Collections.shuffle((List) buffer);
}
LOG.info(
"{} ES query returned {} hits from {} buckets in {} msec with {} already being processed",
logIdprefix, numhits, numBuckets, timeTaken, alreadyprocessed);
esQueryTimes.addMeasurement(timeTaken);
eventCounter.scope("already_being_processed").incrBy(alreadyprocessed);
eventCounter.scope("ES_queries").incrBy(1);
eventCounter.scope("ES_docs").incrBy(numhits);
// reset the value for next fetch date if the previous one is too old
if (resetFetchDateAfterNSecs != -1) {
Calendar diffCal = Calendar.getInstance();
diffCal.setTime(lastDate);
diffCal.add(Calendar.SECOND, resetFetchDateAfterNSecs);
// compare to now
if (diffCal.before(Calendar.getInstance())) {
LOG.info(
"{} lastDate set to null based on resetFetchDateAfterNSecs {}",
logIdprefix, resetFetchDateAfterNSecs);
lastDate = null;
}
}
// optimise the nextFetchDate by getting the most recent value
// returned in the query and add to it, unless the previous value is
// within n mins in which case we'll keep it
else if (mostRecentDateFound != null && recentDateIncrease >= 0) {
Calendar potentialNewDate = Calendar.getInstance();
potentialNewDate.setTime(mostRecentDateFound);
potentialNewDate.add(Calendar.MINUTE, recentDateIncrease);
Date oldDate = null;
// check boundaries
if (this.recentDateMinGap > 0) {
Calendar low = Calendar.getInstance();
low.setTime(lastDate);
low.add(Calendar.MINUTE, -recentDateMinGap);
Calendar high = Calendar.getInstance();
high.setTime(lastDate);
high.add(Calendar.MINUTE, recentDateMinGap);
if (high.before(potentialNewDate)
|| low.after(potentialNewDate)) {
oldDate = lastDate;
}
} else {
oldDate = lastDate;
}
if (oldDate != null) {
lastDate = potentialNewDate.getTime();
LOG.info(
"{} lastDate changed from {} to {} based on mostRecentDateFound {}",
logIdprefix, oldDate, lastDate, mostRecentDateFound);
} else {
LOG.info(
"{} lastDate kept at {} based on mostRecentDateFound {}",
logIdprefix, lastDate, mostRecentDateFound);
}
}
// change the date if we don't get any results at all
if (numBuckets == 0) {
lastDate = null;
}
// remove lock
isInESQuery.set(false);
}
}
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