>> If you're doing a full optimize, you're still using a single thread. Am I >> wrong? > > Depends on how many merges are required, and, the merge scheduler. In > this case (w/ 7000 segments, which is way too many, normally!), > assuming ConcurrentMergeScheduler, multiple threads will be used since > many merges will be pending. > > When it gets down to the last (enormous) merge, it's only one thread. I'm speaking about full optimize. Is there any way to do it more efficiently then running a single, last (enormous) merge? If you try to parallelize, you're merging some documents several times (more work) and killing your disks, as merges are mostly IO-bound.
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