Hello Geert-Jan,
it's possible to merge several parallel physical indexes (viewed as one
logical index with a ParallelReader).
Just use the method IndexWriter.addIndexes(IndexReader[] readers):
IndexReader[] physicalReaders = ...; // Your readers here
IndexWriter iw = new IndexWriter(...);
ParallelReader parallelReader = new ParallelReader(true);
for(IndexReader reader : physicalReaders)
parallelReader .add(reader);
IndexReader[] readersToMerge = { parallelReader };
iw.addIndexes(readersToMerge);
// Optional optimize
iw.optimize();
iw.close();
parallelReader.close();
I used this trick to deploy an index made of 4 parallel indexes. Using
ParallelReader on large indexes is not very efficient for searching ,
but I need to use parallel indexes because one of them is huge but
evolve very slowly compared to the others.
Jérôme
Britske a écrit :
Given two parallel indexes which contain the same products but different
fields, one with slowly changing fields and one with fields which are
updated regularly:
Is it possible to periodically merge these to form a single index? (thereby
representing a frozen snapshot in time)
For example: Can indexWriter.addIndexesNoOptimize handle this, or was it
(only) designed for merging shards?
If not, is there another option (3rd party or not) to use, or would I have
to resort to low-level hacking?
Thanks,
Geert-Jan
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