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https://issues.apache.org/jira/browse/SOLR-2809?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13120185#comment-13120185
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Yonik Seeley commented on SOLR-2809:
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bq. Multiple leases could lead to searchers piling up
It's not so much the number, but how long.
A good default would be perhaps 1 sec... long enough for most individual
requests to complete, not long enough to cause massive pile-up.
bq. ... perhaps it's less expensive to pass around searcher versions and
fail+retry distributed requests if the reported version from a node disagrees
with the version obtained during earlier phases?
That's a good idea, and would have been a nice simple way to do it before NRT
appeared on the scene ;-)
bq. I guess it depends on the rate of change, and consequently the likelihood
of failure.
Right. It would be nice to allow the user to select the trade-off. For
example with leases, the user could specify an expensive request (that is
hopefully run infrequently) that absolutely needs consistency (and fails if it
can't be achieved.) The user could specify a longer lease for this request
(like 60 sec) to ensure that it can normally complete. This is much nicer than
saying "requests longer than the NRT commit frequency cannot be guaranteed to
be correct".
> searcher leases
> ---------------
>
> Key: SOLR-2809
> URL: https://issues.apache.org/jira/browse/SOLR-2809
> Project: Solr
> Issue Type: New Feature
> Reporter: Yonik Seeley
>
> Leases/reservations on searcher instances would give us the ability to use
> the same searcher across phases of a distributed search, or for clients to
> send multiple requests and have them hit a consistent/unchanging view of the
> index. The latter requires something extra to ensure that the load balancer
> contacts the same replicas as before.
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