robert engels wrote:
I don't think this would be any difference performance wise, and might
actually be slower.
When you call FD.sync() it only needs to ensure the dirty blocks
associated with that descriptor need to be saved.
The potential benefit is that you wouldn't have to wait for things to be
written as you close files. So, with write-behind, data could be
written while the CPU moves on to other tasks, only blocking at commit.
With log-based filesystems, only the log need be flushed, and batching
that is a performance win. However, if there are lots of other
applications writing at the same time, and the Lucene update is small,
it could in theory slow things, but my hunch is that it would in
practice frequently nearly eliminate the cost of syncing.
Doug
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