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inplace_enable
Whether to enable in-place index inversion. Optional, default is 0 (use separate temporary files). Introduced in version 0.9.9-rc1.
inplace_enable greatly reduces indexing disk footprint,
at a cost of slightly slower indexing (it uses around 2x less disk,
but yields around 90-95% the original performance).
Indexing involves two major phases. The first phase collects,
processes, and partially sorts documents by keyword, and writes
the intermediate result to temporary files (.tmp*). The second
phase fully sorts the documents, and creates the final index
files. Thus, rebuilding a production index on the fly involves
around 3x peak disk footprint: 1st copy for the intermediate
temporary files, 2nd copy for newly constructed copy, and 3rd copy
for the old index that will be serving production queries in the meantime.
(Intermediate data is comparable in size to the final index.)
That might be too much disk footprint for big data collections,
and inplace_enable allows to reduce it.
When enabled, it reuses the temporary files, outputs the
final data back to them, and renames them on completion.
However, this might require additional temporary data chunk
relocation, which is where the performance impact comes from.
This directive does not affect searchd in any way,
it only affects indexer.
Example:
inplace_enable = 1
