To mix NRT and TLOG/PULL replicas is not recommended. It is all NRT nodes or TLOG nodes mixed (or not) with PULL replicas. As you know, all PULL replicas is not possible.
According to the talk below, one of the reasons is that if you have NRT mixed with TLOG and PULL replicas then a leadership change could make all tlog/pull replicas to download the entire index segments from the new leader: https://youtu.be/XIb8X3MwVKc at minute 23:50 Also see this Activate 2018 talk https://youtu.be/dkWy2ykzAv0 at minute 14:45. And this on is nice too: https://youtu.be/XqfTjd9KDWU Best, Edward Em sex, 30 de nov de 2018 08:56, Daniel Carrasco <d.carra...@i2tic.com escreveu: > Hello, > > We've a cluster consisting in 7 to 10 NRT nodes serving data to a webpage > (products, categories,...), but every time a leader node fails importing > data (connection lost, broken pipe...), the entire cluster goes to > recovering mode and then is not working for about 15-30 minutes. That's a > lot for the webpage so we're trying to reduce that problem to minimal and > we're thinking about new PULL nodes. > > We've for now Solr 7.2.1, but we're planning to migrate to Solr 7.5, and > I've read on Solr guide that recommended setups are: > > - All NRT > - All TLOG > - Some TLOG with PULL replicas > > We're not fully convinced about TLOG replicas because we've read something > about index problems if a node goes down suddenly, or using kill -9 (just > what the init.d script does if takes long to stop/restart), and is the > leader, or about the increase in recovering times respecting to NRT, so > we're thinking about to keep some NRT instead TLOG. > > To have two NRT nodes and the rest TLOG is a good setup, or better to think > in TOG nodes? > > Thanks! > > -- > _________________________________________ > > Daniel Carrasco Marín > Ingeniería para la Innovación i2TIC, S.L. > Tlf: +34 911 12 32 84 Ext: 223 > www.i2tic.com > _________________________________________ >
