On 7-Feb-08, at 2:00 PM, robert engels wrote:
My point is that commit needs to be used in most applications, and
the commit in Lucene is very slow.
You don't have 2x the IO cost, mainly because only the log file
needs to be sync'd. The index only has to be sync'd eventually, in
order to prune the logfile - this can be done in the background,
improving the performance of update and commit cycle.
Also, writing the log file is very efficiently because it is an
append/sequential operation. Writing the segment files writes
multiple files - essentially causing random access writes.
For large segments, multiple sequentially-written large files should
perform similarly to one large sequentially-written file. It is only
close to random access on the smallest segments (which a sufficiently-
large flush-by-ram shouldn't produce).
-Mike
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