What do you have for merge configuration in solrconfig.xml? You should be able to tune it to - approximately - whatever you want without doing the grand optimize: https://cwiki.apache.org/confluence/display/solr/IndexConfig+in+SolrConfig#IndexConfiginSolrConfig-MergingIndexSegments
Regards, Alex. ---- http://www.solr-start.com/ - Resources for Solr users, new and experienced On 2 March 2017 at 16:37, Caruana, Matthew <mcaru...@icij.org> wrote: > Yes, we already do it outside Solr. See https://github.com/ICIJ/extract which > we developed for this purpose. My guess is that the documents are very large, > as you say. > > Optimising was always an attempt to bring down the number of segments from > 60+. Not sure how else to do that. > >> On 2 Mar 2017, at 7:42 pm, Michael Joyner <mich...@newsrx.com> wrote: >> >> You can solve the disk space and time issues by specifying multiple segments >> to optimize down to instead of a single segment. >> >> When we reindex we have to optimize or we end up with hundreds of segments >> and very horrible performance. >> >> We optimize down to like 16 segments or so and it doesn't do the 3x disk >> space thing and usually runs in a decent amount of time. (we have >50 >> million articles in one of our solr indexes). >> >> >>> On 03/02/2017 10:20 AM, David Hastings wrote: >>> Agreed, and since it takes three times the space is part of the reason it >>> takes so long, so that 190gb index ends up writing another 380 gb until it >>> compresses down and deletes the two left over files. its a pretty hefty >>> operation >>> >>> On Thu, Mar 2, 2017 at 10:13 AM, Alexandre Rafalovitch <arafa...@gmail.com> >>> wrote: >>> >>>> Optimize operation is no longer recommended for Solr, as the >>>> background merges got a lot smarter. >>>> >>>> It is an extremely expensive operation that can require up to 3-times >>>> amount of disk during the processing. >>>> >>>> This is not to say yours is a valid question, which I am leaving to >>>> others to respond. >>>> >>>> Regards, >>>> Alex. >>>> ---- >>>> http://www.solr-start.com/ - Resources for Solr users, new and experienced >>>> >>>> >>>>> On 2 March 2017 at 10:04, Caruana, Matthew <mcaru...@icij.org> wrote: >>>>> I’m currently performing an optimise operation on a ~190GB index with >>>> about 4 million documents. The process has been running for hours. >>>>> This is surprising, because the machine is an EC2 r4.xlarge with four >>>> cores and 30GB of RAM, 24GB of which is allocated to the JVM. >>>>> The load average has been steady at about 1.3. Memory usage is 25% or >>>> less the whole time. iostat reports ~6% util. >>>>> What gives? >>>>> >>>>> Running Solr 6.4.1. >>
