Solr Notes All In One

Update CSV
http://wiki.apache.org/solr/UpdateCSV
/solr/update/csv?stream.file=file_path&separator=,&fieldnames=a_list&f.accesstime.map=0:&f.ctime_tdt.map=0:&f.mtm.map=0&skip=type&literal.type=type1
curl http://localhost:8983/solr/update/csv --data-binary @books.csv -H 'Content-type:text/plain; charset=utf-8'
SoftCommit
http://localhost:8080/solr/update?commit=true&softCommit=true
Update Data Via XML
Add Data
http://mailsearchsolr:8765/solr/update?commit=true&stream.body=<add><doc><field name="id">testdoc</field></doc></add>
Delete Data
host:post/solr/update?stream.body=<delete><query>*:*</query></delete>&commit=true
Set Proxy
When used with http monitor tools like fiddle, use -x to set proxy
curl -x localhost:8888 -X PUT -H Content-Type:application/json -d {\"type\":\"string\",\"stored\":\"false\",\"indexed\":\"true\"} "http://host:port/solr/schema/fields/newfield2"
About how to use Curl to import data to Solr, read Learning Solr Code: Import Data to Solr
-- Especailly how to add " or escape ".

View Source code of file
http://localhost:8080/solr/admin/file/?contentType=text/xml;charset=utf-8&file=schema.xml

SignatureUpdateProcessorFactory to generate unqiue string

<processor class="solr.processor.SignatureUpdateProcessorFactory">
 <bool name="enabled">true</bool>
 <str name="signatureField">id</str>
 <bool name="overwriteDupes">false</bool>
 <str name="fields">fields</str>
 <str name="signatureClass">solr.processor.Lookup3Signature</str>
</processor>

BKDRHash

public long BKDRHash(String str)
{
  long seed = 131; // 31 131 1313 13131 131313 etc..
  long hash = 0;
  for(int i = 0; i < str.length(); i++)
  {
     hash = (hash * seed) + str.charAt(i);
  }
  return (hash & 0x7FFFFFFF);
}

Analyzer and Filter
ReversedWildcardFilterFactory
Use this to support leading wildcard and prefix queries.

<filter class="solr.ReversedWildcardFilterFactory" withOriginal="true" maxPosAsterisk="3" maxPosQuestion="2" maxFractionAsterisk="0.33"/>

Code
Change NamedList to SolrParams
In init method, we should convert NamedList to SolrParams first, as SolrParams.get will search multiple paths including defaults settings.

NamedList args;
SolrParams params = SolrParams.toSolrParams(args);
Object obj = params.get(PARAM_MAX_THREAD);

Change SolrParams to NamedList

NamedList namedList = params.toNamedList();

Parse parameters in solrconfig or request
SolrParams params = SolrParams.toSolrParams(args);
List<String> fromFields = org.apache.solr.common.util.StrUtils.splitSmart(str, ",", true);
org.apache.solr.update.processor.SignatureUpdateProcessorFactory.inform(SolrCore)

final SchemaField field = core.getSchema().getFieldOrNull(getSignatureField());
if (null == field) {
  throw new SolrException
 (ErrorCode.SERVER_ERROR,
  "Can't use signatureField which does not exist in schema: "
  + getSignatureField());
}