Big Search with Big Data Principles

Big Search w/ Big Data Principles LuceneRevolution 2012 Eric Pugh | epugh@o19s.com | @dep4b

What is Big Search?

Who am i?• Principal of OpenSource Connections - Solr/Lucene Search Consultancy• Member of Apache Software Foundation• SOLR-284 UpdateRichDocuments (July 07)• Fascinated by the art of software development

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AGILISTA

Telling some stories• Prototyping• Application Development• Maintaining Your Cluster

Not an intro to cloud Computing• See Indexing Big Data on Amazon AWS by Scott Stults @ 1:15 Thursday• See How is the Government Spending Your Money? How GCE is Using Lucene and the GCE Big Data Cloud by Seshu Simhadi @ 2:55 Thursday

Not an intro to SolrCloud!• See How SolrCloud Changes the User Experience In a Sharded Environment by Erick Erickson @ 2:55 Today• See Solr 4: The SolrCloud Architecture by Mark Miller @ 10:45 Tomorrow

My Assumptions for Client X• Big Data is any data set that is primarily at rest due to the difﬁculty of working with it.• Limited selection of tools available.• Aggressive timeline.• All the data must be searched per query.• On Solr 3.x line

Boy meets Girl StoryMetadata Ingest Solr Solr Pipeline Solr SolrContent Files

Bash Rocks

Bash Rocks• Remote Solr stop/start scripts• Remote Indexer stop/start scripts• Performance Monitoring• Content Extraction scripts (+Java)• Ingestor Scripts (+Java)• Artifact Deployment (CM)

Make it easy to change sharding

Make it easy to change sharding public void run(Map options, List<SolrInputDocument> docs) throwsInstantiationException, IllegalAccessException, ClassNotFoundException { IndexStrategy indexStrategy = (IndexStrategy) Class.forName( "com.o19s.solr.ModShardIndexStrategy").newInstance(); indexStrategy.configure(options); for (SolrInputDocument doc:docs){ indexStrategy.addDocument(doc); } }

Separate JVM from Solr Cores• Step 1: Fire up empty Solr’s on all the servers (nohup &).• Step 2:Verify they started cleanly.• Step 3: Create Cores (curl http:// search1.o19s.com:8983/solr/admin? action=create&name=run2)• Step 4: Create a “aggregator” core, passing in urls of Cores. (&property.shards=)

Go Wide Quickly

search1.o19s.comsearch1.o19s.com shard1 shard1 shard1 shard1 :8983 shard1 shard1 shard1 shard1 :8983 search2.o19s.com shard1 shard1 shard1 shard8 :8984 shard1 shard1 shard1 :8983 shard8 shard1 shard1 shard1 :8985 shard12 search3.o19s.com shard1 shard1 shard1 :8985 shard12 shard1 shard1 shard1 :8983 shard12

Simple Pipeline• Simple pipeline• mv is atomic

Don’t Move Files• SCP across machines is slow/error prone• NFS share, single point of failure.• Clustered ﬁle system like GFS (Global File System) can have “fencing” issues• HDFS shines here.• ZooKeeper shines here.

Can you test your changes?

JVM tuning is black art-verbose:gc-XX:+PrintGCDetails-server-Xmx8G-Xms8G-XX:MaxPermSize=256m-XX:PermSize=256m-XX:+AggressiveHeap-XX:+DisableExplicitGC-XX:ParallelGCThreads=16-XX:+UseParallelOldGC

Run, don’t Walk

Grab some Data#!/bin/shSOURCE_SOLR=http://ec2-107-20-92-190.compute-1.amazonaws.com:8983/solr/core0/select?q=*%3A*&start=0&rows=500000&wt=csvTARGET_SOLR=http://localhost:8983/solr/us_patent_grant/update/csvwget -O output.csv $SOURCE_SOLRcurl http://localhost:8983/solr/us_patent_grant/update/csv?skipLines=1&commit=true&optimize=true --data-binary@output.csv -H Content-type:text/plain; charset=utf-8

Using Solr as a key/ value store • thousands of queries per second without real time get.http://localhost:8983/solr/run2_enrichment/select?q=id:DOC45242&fl=entities,html • ??? with real time get?http://localhost:8983/solr/run2_enrichment/get?id=DOC45242&fl=entities,html

Using Solr as key/value store Solr Key/ Value Cache Metadata Ingest Solr Solr Pipeline Solr Solr Content Files

Using Solr as key/value store • thousands of queries per second without real time get.http://localhost:8983/solr/run2_enrichment/select?q=id:DOC45242&fl=entities,html • ??? with real time get? http://localhost:8983/solr/run2_enrichment/get? id=DOC45242&fl=entities,html

Push schema deﬁnition to the application • Not “schema less” • Just different owner of schema! • Schema may have common set of ﬁelds like id, type, timestamp, version • Nothing required.q=intensity_i:[70 TO 0]&fq=TYPE:streetlamp_monitor

Don’t do expensive things in Solr• Tika content extraction aka Solr Cell• UpdateRequestProcessorChain

Avro!• Supports serialization of data readable from multiple languages• It’s smart XML• Handles forward and reverse versions of an object• Compact and fast to read.

Avro! Solr Key/Value Cache .avro Metadata Ingest Solr Solr Pipeline Solr Solr Content Files

No JavaBin /u G te p iv / da e av m r e o!• Avoid Jarmaggeddon• Reﬂection? Ugh.

No JavaBin Solr Key/ Value CacheMetadata Ingest Solr Solr Pipeline Solr SolrContent Files

No JavaBin Solr Key/ Solr 3.4 Value CacheMetadata Ingest Solr Solr Pipeline Solr SolrContent Files

No JavaBin Solr Key/ Solr 3.4 Value CacheMetadata Solr 4 Ingest Solr Solr Pipeline Solr SolrContent Files

No JavaBin Solr Key/ Solr 3.4 Value CacheMetadata Solr 4 Ingest Solr Solr Pipeline Solr SolrContent Which SolrJ Files version do I use?

Upgrade Lucene Indexes Easily • Don’t reindex! • Try out new features! David Lylejava -cp lucene-core.jarorg.apache.lucene.index.IndexUpgrader [-delete-prior-commits] [-verbose] indexDir

Indexing is Easy and Quick

CHEAP AND CHEERFUL < >

NRT versus BigData

The tension betweenscale and update rate Bad Place to Be > 100,000,000 < 10,000,000

The tension between scale and update rate10 million Bad Place 100’s of millions

Grim Reaper

Delayed Replication<requestHandler name="/replication" class="solr.ReplicationHandler" ><lst name="slave"> <str name="masterUrl">http://localhost:8983/solr/replication</str> <str name="pollInterval">36:00:00</str></lst></requestHandler>

Enable/Disable<requestHandler name="/admin/ping" class="solr.PingRequestHandler"><lst name="invariants"> <str name="q">MY HARD QUERY</str> <str name="shards">http://search1.o19s.com:8983/solr/run2_1,http://search1.o19s.com:8983/solr/run2_2,http://search1.o19s.com:8983/solr/run2_2</lst><lst name="defaults"> <str name="echoParams">all</str></lst><str name="healthcheckFile">server-enabled.txt</str></requestHandler>

Enable/Disable• Solr-3301

Provisioning• Chef/Puppet• ZooKeeper• Have you versioned everything to build an index?

TYPICAL ENVIRONMENT

FLEXIBLE ENVIRONMENT

Do I need Failover?• Can I build quickly?• Do I have a reliable cluster?• Am I spread across data centers?• Is sooo 90’s....

Some Other Thoughts

Don’t be Mesmerized

ScientiﬁcMethod

Thank you!• epugh@o19s.com• @dep4b• www.opensourceconnections.com

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Big Search with Big Data Principles

by OpenSource Connections on May 10, 2012

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