Alan Woodward created SOLR-9566:
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Summary: Can we avoid doing recovery when collections are first
created?
Key: SOLR-9566
URL: https://issues.apache.org/jira/browse/SOLR-9566
Project: Solr
Issue Type: Improvement
Security Level: Public (Default Security Level. Issues are Public)
Reporter: Alan Woodward
When a core starts up as part of a collection, and it's not a shard leader, it
goes into recovery, part of which involves a 7 second wait (set in SOLR-7141)
to ensure that updates being sent from the leader don't get missed in between
buffering and replication.
This has the unfortunate side-effect of adding a 7-second pause to collection
creation whenever the replication factor is 2 or more, which slows down tests
massively - for example, DeleteReplicaTest takes about 54 seconds to execute on
my machine, 28 seconds of which is just pauses - over 50% of execution time.
It's not actually possible to add documents to a collection before the creation
request has returned, so the recovery stage here isn't strictly speaking
necessary.
I think we could try adding a parameter to a CoreAdmin create request that says
the core is being created as part of a new collection, so it doesn't need to
try and recover from it's leader when it starts up. Does this sound sensible,
or am I missing something here?
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