Solr & Lucene at EtsyGregg Donovan

gregg@etsy.comTechnical Lead, Search

1.5 years Solr & Lucene at Etsy.com

3 years Solr & Lucene at TheLadders.com

8+ million members

9.3 million items

800k+ active sellers

1+ billion pageviews / month

Maximize Solr out-of-the-box

Hack at a low-level

Know when to do each

Or

Don’t fear trunk

builds.apache.org/job/Solr-trunk/changes

http://localhost:8393/solr/placesuggest/select?

q={!lucene}s*&sfield=latlong&pt=37.595804,-122.364521

&sort=div(geodist(),sqrt(sum(population,50)))%20asc

{!lucene}

{!field}

{!func}

{!dismax}

{!edismax}

{!boost}

{!term}

Cheap ranking awesomeness

ExternalFileField ftw!

schema.xml: <fieldType name="file" keyField="treasury_id" defVal="0" stored="false" indexed="true" class="solr.ExternalFileField" valType="float"/> <field name="hotness" type="file"/>

/search/data/treasury/external_hotness.1306390802088:1=2.32=1.73=1.1

Solr query:sort={!func}hotness+desc

ExternalFileField caveats

More relevance: boost query

http://localhost:8983/solr/listings/select?q={!boost b=$rel v=$qq}&rel=category:furniture^10+OR+((-material:acrylic)^5)&qq=desk

Impression tracking

etsy.com/search?q=desk&explain=1

Side-by-Side testing

Cheap performance wins

Put off sharding till you must

cat ${indexDir}/* > /dev/null

Return IDs, minimize stored fields

RAM: $10-20 / GB

SSD: 0.1ms vs 10ms seek

Custom?

solr-user

Tools for low-level hacking

Continuous deployment

One button. So easy a dog could do it.

MTTR > MTBF

github.com/etsy/logster

Tracking GC

export GC_DEBUG="-verbose:gc -XX:+PrintGCDateStamps -XX:+PrintHeapAtGC -XX:+PrintGCApplicationStoppedTime -XX:+PrintAdaptiveSizePolicy -XX:AdaptiveSizePolicyOutputInterval=1 -XX:+PrintTenuringDistribution -XX:+PrintGCDetails -Xloggc:/var/log/search/gc.log"

Alerting

Testing

SaveAsFixture

Profiling

Java Primitive Library

fastutil

trove4j

Know the hooks

QParserPlugin

SolrEventListener

SolrRequestHandler

SearchComponent

SolrCache

ValueSourceParser

SolrIndexSearcher gotchasreference counting

using it as a cache key:

WeakHashMap<SolrIndexSearcher,MyValue> myCache...

Example:personalized collections

fq={!term f=id}123 OR {!term f=id}456

Need a map of PK to docId

Use custom SolrCache plus SolrEventListener to fill it

github.com/giokincade/FastTermFilter

i18n currency sorting and filtering

currency.xml:

<currencyConfig version="1.0">! <currencies>! ! <currency name="United States Dollar" symbol="$" code="USD"/>! ! <currency name="Australian Dollar" symbol="$" code="AUD"/>! ! <currency name="Canadian Dollar" symbol="$" code="CAD"/>! ! <currency name="Czech Koruna" symbol="Kč" code="CZK"/>...! </currencies>! <rates>! ! <rate from="USD" to="AUD" rate="1.168750"/>! ! <rate from="USD" to="CAD" rate="1.085000"/>! ! <rate from="USD" to="CZK" rate="20.107500"/>! ! <rate from="USD" to="DKK" rate="5.323750"/>... </rates></currencyConfig>

price:[10.00USD to 50.00USD]

price:20.00EUR

price:[$10.00 to $50.00]

MoneyFieldType.java:

@Override public Query getRangeQuery(QParser parser, SchemaField field, String part1, String part2, final boolean minInclusive, final boolean maxInclusive) { final MoneyValue p1 = MoneyValue.parse(part1, defaultCurrency); final MoneyValue p2 = MoneyValue.parse(part2, defaultCurrency);

if (!p1.getCurrencyCode().equals(p2.getCurrencyCode())) { throw new SolrException(SolrException.ErrorCode.BAD_REQUEST, new ParseException("Cannot parse range query " + part1 + " to " + part2 + ": range queries only supported when upper and lower bound have same currency.")); }

String currencyCode = p1.getCurrencyCode(); final MoneyValueSource vs = new MoneyValueSource(field, currencyCode, parser);

return new SolrConstantScoreQuery(new ValueSourceRangeFilter(vs, p1.getAmount() + "", p2.getAmount() + "", minInclusive, maxInclusive)); }

Replication gotcha

SOLR-2202

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