mayya-sharipova opened a new pull request #728:
URL: https://github.com/apache/lucene/pull/728


   Currently VectorValuesWriter buffers vectors in memory.
   The  problem is that as multi-dimensional vectors consume a lot of memory,
   a lot of flushes are triggered. Each flush is a very expensive involving
   the construction of an HNSW graph.
   
   This patch instead buffers KNN vectors on disk, which prevents
   construction of new segments only because RAM is full.
   
   Also unset RAMBufferSizeMB in KnnGraphTester, now defaults to  16Mb


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