The reason why you pass the DirectoryFactory at startup is so every collection/core that's created is automatically stored in HDFS before solrconfig.xml is read to know that's where they should be stored.
If you prefer to only store certain collections/cores in HDFS, you would only set those properties in the solrconfig.xml files for the collection. The properties do still need to be defined in solrconfig.xml, which the documentation you pointed to says - make the change in solrconfig.xml, then pass the properties at startup. On Thu, Jun 7, 2018 at 9:25 AM Greenhorn Techie <greenhorntec...@gmail.com> wrote: > Shawn, Thanks for your response. Please find my follow-up questions: > > 1. My understanding is that Directory Factory settings are typically at a > collection / core level. If thats the case, what is the advantage of > passing it along with the start script? > 2. In your below response, did you mean that even though I pass the > settings as part of start script, they dont have any value unless they are > mentioned as part of the solrconfig.xml file? > 3. As per my previous email, what does Solr do if my solfconfig.xml contain > NRTDirectoryFactory setting while the solr script is started with HDFS > settings? > > Thanks > > > On 7 June 2018 at 15:08:02, Shawn Heisey (apa...@elyograg.org) wrote: > > On 6/7/2018 7:37 AM, Greenhorn Techie wrote: > > When the above settings are passed as part of start script, does that > mean > > whenever a new collection is created, Solr is going to store the indexes > in > > HDFS? But what if I upload my solrconfig.xml to ZK which contradicts with > > this and contains NRTDirectoryFactory setting? Given the above start > > script, should / could I skip the directory factory setting section in my > > solrconfig.xml with the assumption that the collections are going to be > > stored on HDFS *by default*? > > Those commandline options are Java system properties. It looks like the > example configs DO have settings in them that would use the > solr.directoryFactory and solr.lock.type properties. But if your > solrconfig.xml file doesn't reference those properties, then they > wouldn't make any difference. The last one is probably a setting that > HdfsDirectoryFactory uses that doesn't need to be explicitly referenced > in a config file. > > Thanks, > Shawn >
