Solr @ Etsy - Apache Lucene Eurocon
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Transcript of Solr @ Etsy - Apache Lucene Eurocon
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Solr @
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Things I’m not going to talk about:
A/B Testingi18n
Continuos Deployment
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AboutUs
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10+ Million Listings500 qps
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Architecture Overview
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Architecture OverviewThrift
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Architecture OverviewThrift
struct Listing { 1: i64 listing_id }
struct ListingResults { 1: i64 count, 2: list<Listing> listings }
service Search { ListingResults search(1:string query) }
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Architecture OverviewThrift
public class Search { public interface Iface { public ListingResults search(String query) throws TException; }
Generated Java server code:
Generated PHP client code: class SearchClient implements SearchIf {
/**...**/ public function search($query) { $this->send_search($query); return $this->recv_search(); }
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Architecture OverviewThrift
• Service Encapsulation• Reduced Network Traffic
Why use Thrift?
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Architecture OverviewThrift
• Index Size• Easy to scale PK lookups
Why only return IDs?
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The Search Server
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Architecture OverviewSearch Server
• Identical Code + Hardware• Roles/Behavior controlled by Env variables• Single Java Process• Solr running as a Jetty Servlet• Thrift Servers • Smoker
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Architecture OverviewSearch Server
Master-specific processes:• Incremental Indexer• External File Field Updaters
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Load Balancing
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Load BalancingThrift TSocketPool
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Load BalancingThrift TSocketPool
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Load BalancingThrift TSocketPool
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Load BalancingServer Affinity
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Load BalancingServer Affinity Algorithm
$serversNew = array();
$numServers = count($servers); while($numServers > 0) {
// Take the first 4 chars of the md5sum of the server count // and the query, mod the available servers $key = hexdec(substr(md5($numServers . '+' . $query),0,4))%($numServers); $keySet = array_keys($servers); $serverId = $keySet[$key];
// Push the chosen server onto the new list and remove it // from the initial list array_push($serversNew, $servers[$serverId]); unset($servers[$serverId]); --$numServers;
}
[“host2”, “host3”, “host1”, “host4”]
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Load BalancingServer Affinity Algorithm
“jewelry” [“host2”, “host3”, “host1”, “host4”]
“scarf”
$key = hexdec(substr(md5($query),0,4))
[“host2”, “host3”, “host1”, “host4”]
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Load BalancingServer Affinity Algorithm
“jewelry” [“host2”, “host3”, “host1”, “host4”]
“scarf” [“host2”, “host1”, “host4”, “host3”]
$key = hexdec(substr(md5($numServers . '+' . $query),0,4))%(count($servers));
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Load BalancingServer Affinity Results
2% 20%
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Load BalancingServer Affinity Caveats
• Stemming / Analysis • Be wary of query distribution
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Replication
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ReplicationThe Problem
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ReplicationThe Problem
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ReplicationMulticast Rsync?
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ReplicationMulticast Rsync?
[15:25] <engineer> patrick: i'm gonna test multi-rsyncing some indexes from host1 to host2 and host3 in prod. I'll be watching the graphs and what not, but let me know if you see anything funky with the network[15:26] <patrick> ok....
[15:31] <keyur> is the site down?
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ReplicationMulticast Rsync?
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Hmm...Bit Torrent?
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ReplicationBit Torrent POCUsing BitTornado:
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ReplicationBit Torrent + Solr
Fork of TTorent: https://github.com/etsy/ttorrent
Multi-File SupportPerformance Enhancements
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ReplicationBit Torrent + Solr
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ReplicationBit Torrent + Solr
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ReplicationBit Torrent + Solr
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ReplicationBit Torrent + Solr
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Solr InterOp
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QParsers
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“writing query strings is for suckers”
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Solr InterOpQParsers
http://host:8393/solr/person/select/?q=_query_:%22{!dismax %20qf=$fqf%20v=$fnq}%22%20OR%20(_query_:%22{!dismax%20qf=$fiqf %20v=$fiq}%22%20AND%20(_query_:%22{!dismax%20qf=$lwqf%20v=$lwq} %22%20OR%20_query_:%22{!dismax%20qf=$lqf%20v=$lq}%20%22))&fnq= %22giovanni%20fernandez-kincade%22&fqf=full_name^4&fiq=giovanni&fiqf=first_name^2.0%20first_name_syn&qt=standard&lwq=fernandez-kincade*&lwqf=last_name&lq=fernandez-kincade&lqf=last_name^3
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Solr InterOpQParsers
http://host:8393/solr/person/select/?q={!personrealqp}giovanni %20fernandez-kincade
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Solr InterOpQParsers
class PersonNameRealQParser extends QParser { public PersonNameRealQParser(String qstr, SolrParams localParams,
SolrParams params, SolrQueryRequest req) { super(qstr, localParams, params, req); }
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Solr InterOpQParsers
@Override public Query parse() throws ParseException { TermQuery exactFullNameQuery = new TermQuery(new Term("full_name", qstr)); exactFullNameQuery.setBoost(4.0f);
String[] userQueryTerms = qstr.split("\\s+"); Query firstLastQuery = null;
if (2 == userQueryTerms.length) firstLastQuery = parseAsFirstAndLast(userQueryTerms[0], userQueryTerms[1]); else firstLastQuery = parseAsFirstOrLast(userQueryTerms);
DisjunctionMaxQuery realNameQuery = new DisjunctionMaxQuery(0); realNameQuery.add(exactFullNameQuery); realNameQuery.add(firstLastQuery);
return realNameQuery; }
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Solr InterOpQParsersThe QParserPlugin that returns our new QParser: public class PersonNameRealQParserPlugin extends QParserPlugin { public static final String NAME = "personrealqp";
@Override public void init(NamedList args) {}
@Override public QParser createParser(String qstr, SolrParams localParams,
SolrParams params, SolrQueryRequest req) { return new PersonNameRealQParser(qstr, localParams, params, req); } }
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Solr InterOpQParsers
Registering the plugin in solrconfig.xml:
<queryParser name="personrealqp" class="com.etsy.person.solr.PersonNameRealQParserPlugin" />
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Custom Stemmer
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Solr InterOpCustom Stemmer
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Solr InterOpCustom Stemmer
banded, banding, birding, bouldering, bounded, buffing, bundler, canning, carded, circled, coupler, dangler, doubler, firring, foiling, hooper, japanned, lipped, napped, papered, pebbled, pitted, pocketed, reductive, ricer, rooter, roper, seeded, shouldered, silvered, skinning, spindling, staining, stitcher,
strapped, threaded, yellowing
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Solr InterOpCustom StemmerFirst we extend KStemmer and intercept stem calls:
public class LStemmer extends KStemmer {
/**.....**/
@Override String stem(String term) { String override = overrideStemTransformations.get(term); if(override != null) return override; return super.stem(term); } }
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Solr InterOpCustom Stemmer
Then create a TokenFilter that uses the new Stemmer:
final class LStemFilter extends TokenFilter {
/**.....**/ protected LStemFilter(TokenStream input, int cacheSize) { super(input); stemmer = new LStemmer(cacheSize); } @Override public boolean incrementToken() throws IOException { /**....**/ }
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Solr InterOpCustom Stemmer
Create a FilterFactory that exposes it:
public class LStemFilterFactory extends BaseTokenFilterFactory { private int cacheSize = 20000; @Override public void init(Map<String, String> args) { super.init(args); String cacheSizeStr = args.get("cacheSize"); if (cacheSizeStr != null) { cacheSize = Integer.parseInt(cacheSizeStr); } } @Override public TokenStream create(TokenStream in) { return new LStemFilter(in, cacheSize); } }
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Solr InterOpCustom Stemmer
And finally plug it into your analysis chain:
<analyzer> <tokenizer class="solr.WhitespaceTokenizerFactory"/> <filter class="solr.ASCIIFoldingFilterFactory"/> <filter class="solr.StopFilterFactory" ignoreCase="true"
words="solr/common/conf/stopwords.txt"/> <filter class="com.etsy.solr.analysis.LStemFilterFactory" /> <filter class="solr.RemoveDuplicatesTokenFilterFactory"/> </analyzer>
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Thanks!