David Smiley created SOLR-18331:
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Summary: TLOG/PULL should be notified to pull just-in-time; no
polling
Key: SOLR-18331
URL: https://issues.apache.org/jira/browse/SOLR-18331
Project: Solr
Issue Type: Improvement
Components: SolrCloud
Reporter: David Smiley
Proposal: a leader should notify it's followers to pull just-in-time (a fresh
open searcher). Compared to polling, this can reduce the worst case indexing
latency by just over 50%, since the default poll time is half the auto-commit.
TBD if the leader or the follower delays if it's notified too quickly. The
notification might even provide the list of files & timestamps – whenever a
follower first needs to get from the leader when it synchronizes.
Today: It's sad that a TLOG/PULL replica that isn't the leader will poll the
leader. For some shards, there could be great stretches of time of nothing
happening. Each poll results in observability noise. Transient cores is now
gone but nonetheless the polling keept an unused leader from getting evicted.
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