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From Jason Rutherglen <>
Subject Create large preallocated file blocks when performing merges
Date Thu, 01 Oct 2009 00:47:48 GMT
I wanted to post this before I forgot. Based on an informal
discussion at the Katta meeting regarding the high write
throughput of Zookeeper (see ) which uses
the database technique of preallocating large empty files before
filling them up with real data, it came up that perhaps this
technique could help with the speed of Lucene segment merging?

Lucene would preallocate new target merge files with zeroes of
lets say one megabyte in size, then proceed to fill it in with
the merge data, truncating the file to the actual size when
completed. This would probably only need to be switched on when
merging large segments.

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