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From Andre Bois-Crettez <>
Subject Re: optimization suggstions
Date Tue, 12 Nov 2013 17:19:37 GMT
I suggest putting autoCommit at something as big as your memory allows
(eg 15 minutes) to flush the update log to disk and start merging
segments, but not yet visible on the search.
Then at the end, send an explicit <commit/> wich will both persist on
disk the remainder of indexed docs and make everything visible to search
(and rebuild caches).

This should bring a much smoother load.

With autowarm at 100% on all the caches, the query performance should
not drop too much :
You may have to add static warming queries too.


On 11/12/2013 06:04 PM, Shalin Shekhar Mangar wrote:
> On Tue, Nov 12, 2013 at 9:56 PM, Eric Katherman <> wrote:
>> Stats:
>> default config for 4.3.1 on a high memory AWS instance using jetty.
>> Two collections each with less than 700k docs per collection.
>> We seem to hit some performance lags when doing large commits.  Our front end service
allows customers to import data which is stored in Mongo and then indexed in Solr.  We keep
all of that data and do one big commit at the end rather than doing commits for each record
along the way.
> What do you mean by a performance lag? Large query times after a
> commit are to be expected. They can be managed better with good auto
> warming queries.
>> Would it be better to use something like autoSoftCommit and just commit each record
as it comes in?  Or is the problem more about disk IO?    Are there some other "low hanging
fruit" things we should consider?  The solr dashboard shows that there is still plenty of
free memory during these imports so it isn't running out of memory and reverting to disk.
> Committing after every record is bound to slow down things even more.
> Batched updates are almost always better. Perhaps you need to tune
> your auto commit settings to commit in smaller batches rather than in
> one big bang at the end.
>> Thanks!
>> Eric
> --
> André Bois-Crettez
> Software Architect
> Search Developer

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