I have also looked at this and would like to gain more perspective on
it. Another related wrinkle to watch out for: I'm pretty sure that
Solr replication doesn't re-use core readers over existing segments. I
noticed this (along with my colleague Patson) when looking at
unexpectedly high CPU usage o
Can anyone explain how the ReplicationHandler/IndexFetcher manipulates
index files (adds files/segments, removes some too) without
interfering with the live index? I see IndexFetcher can call
SolrCoreState.closeIndexWriter. I've also seen evidence in code
nearby that suggests another data dir may
