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Posted to dev@lucene.apache.org by "Alan Woodward (JIRA)" <ji...@apache.org> on 2016/10/17 16:17:58 UTC
[jira] [Commented] (SOLR-9566) Can we avoid doing recovery when
collections are first created?
[ https://issues.apache.org/jira/browse/SOLR-9566?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15582651#comment-15582651 ]
Alan Woodward commented on SOLR-9566:
-------------------------------------
I got a verbal +1 from [~markrmiller@gmail.com] at Revolution, so I'll commit this shortly. Anybody who disagrees should speak up now...
> 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
> Attachments: SOLR-9566.patch
>
>
> 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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