Hello,
I'm using hibernate search in on of my java project and I need some help.
I've seen that you can configure some Lucene properties into the hibernate config file like maxMergeDocs,...
But is not possible to set the maxFieldLength lucene property.
How can I manage this?
Thanks in advence.

Hi,

it seems that this property is just not exposed yet. I guess no one really needed it so far. I created a Jira issue for it - http://opensource.atlassian.com/projects/hibernate/browse/HSEARCH-200.

Hi,
I've attached a patch to Hardy's Jira, it contains documentation updates as well
(apply it to trunk).
you could try it if you like, but would suggest against setting different parameters
for the batch and transaction sections; the final version of the patch will log something about it or avoid it.

Do you think there could be some good reason to set the two parameters differently?

regards,

I had to change the source to adapt this property like this:


1. src\org\hibernate\search\backend\Workspace.java
• public IndexWriter getIndexWriter() ... writer.setMaxFieldLength(indexingParams.getBatchMaxFieldLenght() );


2. src\org\hibernate\search\backend\LuceneIndexingParameters.java
• private static final int DEFAULT_MAX_FIELD_LENGHT = IndexWriter.DEFAULT_MAX_FIELD_LENGTH;
• private static final int MAX_FIELD_LENGHT = Integer.MAX_VALUE;
• public LuceneIndexingParameters() ...
batchMaxFieldLenght = DEFAULT_MAX_FIELD_LENGHT;
• public int getBatchMaxFieldLenght() {
if (batchMaxFieldLenght < 0) {
batchMaxFieldLenght = MAX_FIELD_LENGHT;
}
return batchMaxFieldLenght;
}

public void setBatchMaxFieldLenght(int batchMaxFieldLenght) {
this.batchMaxFieldLenght = batchMaxFieldLenght;
}



3. src\org\hibernate\search\store\DirectoryProviderFactory.java
• private static final String MAX_FIELD_LENGTH = "max_field_length";
• private void configureIndexingParameter(...) -----
s = indexProps.getProperty(BATCH + MAX_FIELD_LENGTH);
if (!StringHelper.isEmpty( s )) {
try{
indexingParams.setBatchMaxFieldLenght(Integer.valueOf(s));
} catch (NumberFormatException ne) {
throw new SearchException("Invalid value for " + BATCH + MAX_FIELD_LENGTH + ": " + s);
}
}


Compile source and use the new jar file in your project and add this property to your cfg file:
<property name="hibernate.search.default.batch.max_field_length">
-1
</property>

If not set the default value is set, if it's a negatif number value is Integer.MAXVALUE otherwise set with the written value.

Hi,
very nice you tried!
I don't really undertand your code without formatting and line numbers, but it looks like you've complicated it a bit, you didn't try my patch?

a part from the huge documentation update, you have to add just three lines of code;

just add this:

to the IndexWriterSetting enum types.


Also I woudn't recommend to set the defaults to MAX_INTEGER; with the above patch you get the lucene defaults when not setting anything.