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From "Mark Miller (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-1028) Automatic core loading unloading for multicore
Date Wed, 31 Oct 2012 00:48:12 GMT

    [ https://issues.apache.org/jira/browse/SOLR-1028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13487418#comment-13487418
] 

Mark Miller commented on SOLR-1028:
-----------------------------------

bq. The ugly thing I see in SolrCloud is the single huge file stored in zk . It's not suitable
for tens of thousands of cores.  We will easily run into multiple megabytes

Yeah, this is my main concern as well - though it remains to be seen if a few megabytes is
an issue on a gigbit or better network.

We actually did things differently in the past, but that came with it's own issues.

                
> Automatic core loading unloading for multicore
> ----------------------------------------------
>
>                 Key: SOLR-1028
>                 URL: https://issues.apache.org/jira/browse/SOLR-1028
>             Project: Solr
>          Issue Type: New Feature
>          Components: multicore
>    Affects Versions: 4.0, 5.0
>            Reporter: Noble Paul
>            Assignee: Erick Erickson
>             Fix For: 4.1, 5.0
>
>         Attachments: SOLR-1028.patch, SOLR-1028.patch
>
>
> usecase: I have many small cores (say one per user) on a single Solr box . All the cores
are not be always needed . But when I need it I should be able to directly issue a search
request and the core must be STARTED automatically and the request must be served.
> This also requires that I must have an upper limit on the no:of cores that should be
loaded at any given point in time. If the limit is crossed the CoreContainer must unload a
core (preferably the least recently used core)  
> There must be a choice of specifying some cores as fixed. These cores must never be unloaded


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