Hi Shawn, Thanks for the reply, it is useful. The reason I asked about the Cache sizes is I had read that configuring the Cache sizes of Solr does not provide you enough benefits, instead it is better to provide a lot of memory space to the Solr outside the JVM heap.
Is it true that in general the strategy of using the OS buffer cache works better instead of using a large Cache inside the JVM heap? I was looking for some numbers that people have used for configuring these Caches in the past and the rational for choosing these values. Thanks Suresh On 5/11/17, 11:13 PM, "Shawn Heisey" <apa...@elyograg.org> wrote: >On 5/11/2017 4:58 PM, Suresh Pendap wrote: >> This question might have been asked on the solr user mailing list >>earlier. Solr has four different types of Cache DocumentCache, >>QueryResultCache, FieldValueCache and FilterQueryCache >> I would like to know which of these Caches are off heap cache? > >None of them are off-heap. For a while, there was a forked project >called Heliosearch that did have a bunch of off-heap memory structures, >but it is my understanding that Heliosearch is effectively dead now. > >There are at least three issues for bringing this capability to Solr, >but none of them have been added yet. > >https://issues.apache.org/jira/browse/SOLR-6638 >https://issues.apache.org/jira/browse/SOLR-7211 >https://issues.apache.org/jira/browse/SOLR-7210 > >> Which Caches have the maximum impact on the query latency and it is >>recommended to configure that Cache? > >This is so dependent on your exact index and your exact queries that >nobody can give you a reliable answer to that question. > >The filterCache is pretty good at speeding things up when you have >filter queries that get reused frequently, but depending on how your >setup works, it might not provide the most impact. > >> I also would like to know if there is any document which provides >>guidelines on performing Capacity planning for a Solr cluster. > >No. It's not possible to provide general information. See this: > >https://lucidworks.com/sizing-hardware-in-the-abstract-why-we-dont-have-a- >definitive-answer/ > >Thanks, >Shawn >
