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https://issues.apache.org/jira/browse/SOLR-486?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12605126#action_12605126
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Noble Paul commented on SOLR-486:
---------------------------------
If we take a look at the data that is written down by NamedListCodec there are
a lot of "names" which are repeated. If we could avoid the repetitions we can
achieve better optimization.
Can we have another type EXTERN_STRING
The NamedListCodec maintains a Map<String,Integer> of EXTERN_STRING vs index
as it is written out. When the same string is written it checks up in the List
whether it already has a reference.
While decoding all the EXTERN_STRING values are copied into a List <String>.
When an EXTERN_STRING with an index comes it is copied from the List.
{code:title=NamedListCodec.java}
private int stringsCount = -1;
private Map<String,Integer> stringsMap;
private List<String > stringsList;
public void writeExternString(String s) throws IOException {
writeTag(EXTERN_STRING);
if(s == null) {
writeTag(NULL) ;
return;
}
if(stringsMap.containsKey(s)){
writeInt(stringsMap.get(s));
} else {
writeStr(s);
stringsCount++;
if(stringsMap == null) stringsMap = new HashMap<String, Integer>();
stringsMap.put(s,stringsCount);
}
}
public String readExternString(FastInputStream fis) throws IOException {
Object o = readVal(fis);
if(o == null) return null;
if (o instanceof String) {
String s = (String) o;
if(stringsList == null ) stringsList = new ArrayList<String>();
stringsList.add(s);
return s;
} else {// this must be an integer
int index = (Integer)o;
return stringsList.get(index);
}
}
{code}
> Support binary formats for QueryresponseWriter
> ----------------------------------------------
>
> Key: SOLR-486
> URL: https://issues.apache.org/jira/browse/SOLR-486
> Project: Solr
> Issue Type: Improvement
> Components: clients - java, search
> Reporter: Noble Paul
> Assignee: Yonik Seeley
> Fix For: 1.3
>
> Attachments: solr-486.patch, SOLR-486.patch, SOLR-486.patch,
> SOLR-486.patch, SOLR-486.patch, SOLR-486.patch, SOLR-486.patch,
> SOLR-486.patch, SOLR-486.patch
>
>
> QueryResponse writer only allows text data to be written.
> So it is not possible to implement a binary protocol . Create another
> interface which has a method
> write(OutputStream os, SolrQueryRequest request, SolrQueryResponse response)
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