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Lucene MultiSearcher vs IndexSearcher with MultiReader

I am going to write a real-time search application with distributed indexes. Now I am wondering what is the correct approach to implementing a search on multiple indexes:

I read about MultiSearcher, so one of them would be as follows:

IndexSearcher[] indexSearchers = new IndexSearcher[indexCount]; for (int i = 0; i < indexCount; i++) { File directory = new File(indexdir, String.valueOf(i)); IndexWriter indexWriter = new IndexWriter(FSDirectory.open(directory), analyzer, IndexWriter.MaxFieldLength.LIMITED); IndexReader indexReader = indexWriter.getReader(); indexSearchers[i] = new IndexSearcher(indexReader); } MultiSearcher searcher = new MultiSearcher(indexSearchers);

But, as I see it, this is also possible:

 IndexReader[] indexReader = new IndexReader[indexCount]; for (int i = 0; i < indexCount; i++) { File directory = new File(indexdir, String.valueOf(i)); IndexWriter indexWriter = new IndexWriter(FSDirectory.open(directory), analyzer, IndexWriter.MaxFieldLength.LIMITED); indexReader[i] = indexWriter.getReader(); } IndexSearcher searcher = new IndexSearcher(new MultiReader(indexReader));

Is there a significant difference between the two statements? The second one will be easier to process if the reader does not have data, because I can just call MultiReader.reopen () instead of repeating all IndexReaders, reopen them, and not create new IndexSearchers ...

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Source: https://habr.com/ru/post/911395/

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