Got it, Thanks for helping me Emir. On Tue, Nov 19, 2019 at 12:36 PM Emir Arnautović < emir.arnauto...@sematext.com> wrote:
> Hi, > Copying indices will work and it is a fine approach. An alternative would > be to join new node to a cluster, use add replica to copy cores to this new > node and then remove replicas from old nodes, if you want to move cores. > > Regards, > Emir > -- > Monitoring - Log Management - Alerting - Anomaly Detection > Solr & Elasticsearch Consulting Support Training - http://sematext.com/ > > > > > On 18 Nov 2019, at 13:22, Sripra deep <sriprad...@madstreetden.com> > wrote: > > > > Hi Emir, > > > > Thank you so much. Now I got it cleared with the TLOG purpose. > > I am trying to copy an index of one solr cluster to use it to build > > other solr cluster. I am able to make that work but Is this design okay? > or > > any other approach I can try to get a new cluster spin up with the same > > data as in the old one. > > > > Thanks, > > Sripradeep P > > > > > > On Mon, Nov 18, 2019 at 2:12 PM Emir Arnautović < > > emir.arnauto...@sematext.com> wrote: > > > >> Hi Sripradeep, > >> Simplified: TLog files are used to replay index updates from the last > >> successful hard commit in case of some Solr crashes. It is used on the > next > >> Solr startup. It does not contain all updates, otherwise, it would > >> duplicate the index size. > >> If you start from these premises, you will understand why it is not > copied > >> when adding replicas and why it is not needed and why you cannot use > TLog > >> to spin up a new cluster. > >> > >> HTH, > >> Emir > >> -- > >> Monitoring - Log Management - Alerting - Anomaly Detection > >> Solr & Elasticsearch Consulting Support Training - http://sematext.com/ > >> > >> > >> > >>> On 18 Nov 2019, at 06:35, Sripra deep <sriprad...@madstreetden.com> > >> wrote: > >>> > >>> Hi Guys, > >>> > >>> I observed a scenario with the tlog creation and usage and couldn't > find > >>> any usage for the tlog. > >>> > >>> Solr version: 7.1.0 > >>> Number of shards = 3 > >>> Number of replica = 1 > >>> I indexed the about 10k docs into the collection. > >>> > >>> Scenario 1: > >>> Using add replica collection API, I created one more replica (tried > with > >>> both nrt and tlog) neither of the replicas doesn't pull the tlog files. > >>> Only the index files are pulled from master. > >>> * If the tlog is not present in a replica then during ungraceful > >> shutdown > >>> of the solr server how the replicas will regain the index without tlog > >>> files. > >>> * To verify the above scenario, I killed the newly added replica server > >>> with kill -9 <pid> command and started back > >>> also stopped the leader node. > >>> > >>> Questions: > >>> 1) TLog files are not used even in the case of ungraceful shutdown, > >> where > >>> else it will be used? > >>> 2) Tlog files doesn't get copied to the newly added replica so adding a > >>> new replica to the already created collection with data/index is not > >>> advisable? > >>> 3) Is there a way to make the newly added slave node to replicate the > >>> tlog file as it does for the data/index files from leader? > >>> 4) Is it possible to use the Tlog files /index files from an existing > >>> solr server to spin up a new solr cluster? > >>> > >>> > >>> It would be much helpful for me to understand the core working of Solr > >>> server. > >>> > >>> Thanks, > >>> Sripradeep P > >> > >> > >
