Which Solr version are you using and how often you repeated the test?
> Am 25.10.2019 um 09:16 schrieb Dominique Bejean <dominique.bej...@eolya.fr>: > > Hi, > > I made some benchmarks for bulk indexing in order to compare performances > and ressources usage for NRT versus TLOG replica. > > Environnent : > * Solrcloud with 4 Solr nodes (8 Gb RAM, 4 Gb Heap) > * 1 collection with 2 shards x 2 replicas (all NRT or all TLOG) > * 1 core per Solr Server > > Indexing of a 10.000.000 documents in one json file with bin/post script > > If I compare NRT vs TLOG indexing, I see : > > For collection created with all replicas as NRT > > * Indexing time : 22 minutes > * GC times : identical on all nodes > * GC count : identical on all nodes > * Heap size : identical on all nodes > * CPU Load / CPU usage : identical on all nodes > > For collection created with all replicas as TLOG > > * Indexing time : 34 minutes > * GC times : identical on all nodes > * GC count : identical on all nodes > * Heap size : identical on all nodes > * CPU Load / CPU usage : identical on NRT leaders, divide by 4 on TLOG not > leaders > > > The conclusion seems to be that by using TLOG : > > * You save CPU resources on non leaders nodes at index time > * The JVM Heap and GC are the same > * Indexing performance ares really less with TLOG > > I am disappointed in TLOG mode by very slower indexing time and by JVM Heap > / GC. > > Are these results conform to what we could expect ? > What can explain bad batch indexing performances in TLOG mode ? > > I have Grafana graph for all these metrics during tests. > > Rergards. > > Dominique
