On 12/27/2017 3:15 PM, Damien Kamerman wrote: > You seem to have the soft and hard commits the wrong way around. Hard > commit is more expensive.
That is only the case if the hard commit has openSearcher set to true. It is strongly recommended for ALL users to have openSearcher set to false on autoCommit, and that autoCommit should be enabled. The example configs in recent versions have it enabled, set to 15 seconds, with openSearcher set to false. I personally would set it to 60-120 seconds, just because I would like the server to be doing less work. My servers are not usually index-heavy, though -- so my restarts are still fast even with a 60 second autoCommit. The default for openSearcher is true, so I think that if autoCommit doesn't specify it, then it is enabled. The default for autoCommit should likely change in 8.0, though I do not think that the default for the commit operation itself should change. In some situations, soft commits are just as expensive as hard commits when openSearcher=true. The really expensive part of a commit is opening a new searcher, which soft commit does, so in the recommended config, autoCommit will be much faster than autoSoftCommit. Thanks, Shawn
